Citalopram 20mg Film-Coated Tablets
SUMMARY OF PRODUCT CHARACTERISTICS
1 NAME OF THE MEDICINAL PRODUCT
Citalopram 20mg Film Coated Tablets
2 QUALITATIVE AND QUANTITATIVE COMPOSITION
Each tablet contains citalopram hydrobromide equivalent to 20 mg of citalopram. Excipient with known effect:
Each tablet contains 53.28 mg of lactose monohydrate For the full list of excipients see section 6.1.
3 PHARMACEUTICAL FORM
Film-coated tablet
A white, oval, normal convex film-coated tablet debossed with “CM” scoreline “20” on one side and “G” on the other. The tablet can be divided into equal doses.
4 CLINICAL PARTICULARS
4.1 Therapeutic indications
Treatment of major depressive episodes.
Treatment of panic disorder with or without agoraphobia.
4.2 Posology and method of administration
Posology
Major depressive episodes Adults:
Citalopram should be administered as a single oral dose of 20 mg daily.
Dependent on individual patient response, the dose may be increased to a maximum of 40 mg daily. In general, improvement in patients starts after one week, but may only become evident from the second week of therapy.
As with all antidepressant medicinal products, dosage should be reviewed and adjusted, if necessary, within 3 to 4 weeks of initiation of therapy and thereafter as judged clinically appropriate. Although there may be an increased potential for undesirable effects at higher doses, if after some weeks on the recommended dose insufficient response is seen, some patients may benefit from having their dose increased up to a maximum of 40 mg a day (see section 5.1). Dosage adjustments should be made carefully on an individual patient basis, to maintain the patient at the lowest effective dose.
Following treatment initiation, an antidepressant effect should not be expected for at least two weeks. Treatment should continue until the patient has been free of symptoms for 4-6 months to give adequate protection against the possibility of a relapse.
Panic disorder Adults:
A single oral dose of 10 mg is recommended for the first week before increasing the dose to 20 mg daily. Dependent on individual patient response, the dose may be increased to a maximum of 40 mg daily. Maximum effectiveness is reached after 3 months. It may be necessary to continue treatment for several months.
Patients should be started on 10 mg/day and the dose gradually increased in 10 mg steps according to the patient’s response up to the recommended dose. A low initial starting dose is recommended to minimise the potential worsening of panic symptoms, which is generally recognised to occur early in the treatment of this disorder. Although there may be an increased potential for undesirable effects at higher doses, if after some weeks on the recommended dose insufficient response is seen some patients may benefit from having their dose increased gradually up to a maximum of 40 mg/day (see section 5.1). Dosage adjustments should be made carefully on an individual patient basis, to maintain the patients at the lowest effective dose.
Elderly (> 65 years of age)
For elderly patients the dose should be decreased to half of the recommended dose, e.g.
10-20 mg daily. The recommended maximum dose for the elderly is 20 mg daily.
Paediatric population
Citalopram should not be used in the treatment of children and adolescents under the age of 18 years (see section 4.4).
Reduced hepatic function:
An initial dose of 10 mg daily for the first two weeks of treatment is recommended in patients with mild or moderate hepatic impairment. Depending on individual patient response, the dose may be increased to a maximum of 20 mg daily. Caution and extra careful dose titration is advised in patients with severely reduced hepatic function (see section 5.2).
Reduced renal function:
Dosage adjustment is not necessary for patients with mild to moderate renal dysfunction. No information is available for case of severe impairment of renal function (creatinine clearance <20mL/minute).
Poor metabolisers of CYP2C19:
An initial dose of 10 mg daily during the first two weeks of treatment is recommended for patients who are known to be poor metabolisers with respect to CYP2C19. The dose may be increased to a maximum of 20 mg daily depending on individual patient response (see section 5.2).
Withdrawal symptoms seen on discontinuation:
Abrupt discontinuation should be avoided. When stopping treatment with citalopram the dose should be gradually reduced over a period of at least one to two weeks in order to reduce the risk of withdrawal reactions (see section 4.4 and section 4.8). If intolerable symptoms occur following a decrease in the dose or upon discontinuation of treatment, then resuming the previously prescribed dose may be considered. Subsequently, the physician may continue decreasing the dose, but at a more gradual rate.
Method of administration For oral use.
Citalopram should be administered as a single dose, either in the morning or in the evening. The tablets can be taken with or without food, but with fluid.
4.3 Contraindications
• Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.
• Monoamine Oxidase Inhibitors (MAOIs):
Cases of serious and sometimes fatal reactions have been reported in patients receiving an SSRI in combination with monoamine oxidase inhibitors (MAOI), including the selective MAOI selegiline and the reversible MAOI (RIMA), moclobemide and in patients who have recently discontinued an SSRI and have been started on a MAOI. Some cases presented with features resembling serotonin syndrome.
• Citalopram should not be given to patients receiving MAOIs including selegiline in daily doses exceeding 10 mg/day. Citalopram should not be given for fourteen days after discontinuation of an irreversible MAOI or for the time specified after discontinuation of a reversible MAOI (RIMA) as stated in the prescribing text of the RIMA. MAOIs should not be introduced for seven days after discontinuation of citalopram (see section 4.5).
• 5-HT agonists:
Sumatriptan's serotonergic effects are suspected to be enhanced by SSRIs. Until further evidence is available it is advised not to use citalopram simultaneously with 5-HT agonists e.g. Sumatriptan.
• Citalopram is contraindicated in combination with linezolid unless there are facilities for close observation and monitoring of blood pressure (see section 4.5).
• Citalopram should not be used concomitantly with pimozide (see also section 4.5).
• Citalopram is contraindicated in patients with known QT-interval prolongation or congenital long QT syndrome.
• Citalopram is contraindicated together with medicinal products that are known to prolong the QT-interval (see section 4.5).
4.4 Special warnings and precautions for use
Elderly patients and patients with renal or hepatic impairment
Treatment of elderly patients and patients with reduced kidney and liver function, see
section 4.2.
Paediatric population under 18 years of age
Citalopram should not be used in the treatment of children and adolescents under the age of 18 years. Suicide-related behaviours (suicide attempts and suicidal thoughts) and hostility (predominantly aggression, oppositional behaviour and anger) were more frequently observed in clinical trials among children and adolescents treated with antidepressants compared to those treated with placebo. If, based on clinical need, a decision to treat is nevertheless taken, the patient should be carefully monitored for the appearance of suicidal symptoms. In addition, long-term safety data in children and adolescents concerning growth, maturation and cognitive and behavioural development are lacking.
Suicide/suicidal thoughts or clinical worsening
Depression is associated with an increased risk of suicidal thoughts, self-harm and suicide (suicide-related events). This risk persists until significant remission occurs. As improvement may not occur during the first few weeks or more of treatment, patients should be closely monitored until such improvement occurs. It is general clinical experience that the risk of suicide may increase in the early stages of recovery.
Other psychiatric conditions for which citalopram is prescribed can also be associated with an increased risk of suicide-related events. In addition, these conditions may be co-morbid with major depressive disorder. The same precautions observed when treating patients with major depressive disorder should therefore be observed when treating patients with other psychiatric disorders.
Patients with a history of suicide-related events, or those exhibiting a significant degree of suicidal ideation prior to commencement of treatment are known to be at greater risk of suicidal thoughts or suicide attempts, and should receive careful monitoring during treatment. A meta-analysis of placebo-controlled clinical trials of antidepressant drugs in adult patients with psychiatric disorders showed an increased risk of suicidal behaviour with antidepressants compared to placebo in patients less than 25 years old.
Close supervision of patients and in particular those at high risk should accompany drug therapy especially in early treatment and following dose changes. Patients (and caregivers of patients) should be alerted about the need to monitor for any clinical worsening, suicidal behaviour or thoughts and unusual changes in behaviour and to seek medical advice immediately if these symptoms present.
Diabetes
In patients with diabetes, treatment with an SSRI may alter glycaemic control. Insulin and or oral hypoglycaemic dosage may need to be adjusted.
Seizures
Seizures are a potential risk with antidepressant drugs. Citalopram should be discontinued in any patient who develops seizures. Citalopram should be avoided in patients with unstable epilepsy and patients with controlled epilepsy should be carefully monitored. Citalopram should be discontinued if there is an increase in seizure frequency.
ECT (electroconvulsive therapy)
There is limited clinical experience of concurrent administration of SSRIs and ECT, therefore caution is advisable.
Mania
Citalopram should be used with caution in patients with a history of mania/hypomania. In patients with manic-depressive illness a change towards the manic phase may occur. Citalopram should be discontinued in any patient entering a manic phase.
Psychosis
Treatment of psychotic patients with depressive episodes may increase psychotic symptoms.
Haemorrhage
There have been reports of prolonged bleeding time and/or bleeding abnormalities such as ecchymosis, purpura, gynaecological haemorrhages, gastrointestinal bleedings and other cutaneous or mucous bleedings with SSRIs (see section 4.8). Caution is advised in patients taking citalopram, particularly in concomitant use with oral anticoagulants, active substances known to affect platelet function or other active substances that may increase the risk of haemorrhage (e.g. atypical antipsychotics, acetylsalicylic acid, non-steroidal antiinflammatory drugs (NSAIDs), Ticlopidine and Dipyridamol) as well as in patients with a history of bleeding disorders (see section 4.5).
Serotonin syndrome
In rare cases, serotonin syndrome has been reported in patients using SSRIs. A combination of symptoms, such as agitation, tremor, myoclonus and hyperthermia may indicate the development of this condition (see section 4.5). Treatment with citalopram should be discontinued immediately and symptomatic treatment initiated.
Serotonergic medicines
Concomitant use of citalopram with medicinal products with serotonergic effects such as tramadol, tryptophan, oxitriptan, sumatriptan or other triptans is contraindicated (see section 4.3).
Reversible, selective MAO-A inhibitors
For information on concomitant treatment with non-selective, irreversible MAO- inhibitors see section 4.5.
Hyponatraemia
Hyponatraemia, probably due to inappropriate anti-diuretic hormone secretion (SIADH), has been reported as a rare adverse reaction with the use of SSRIs and generally reverses on discontinuation of therapy. Elderly female patients seem to be at particularly high risk.
St. John’s wort
Undesirable effects may be more common during concomitant use of citalopram and herbal preparations containing St. John’s wort (Hypericum perforatum). Therefore citalopram and St. John’s wort preparations should not be taken concomitantly (see section 4.5).
Akathisia/psychomotor restlessness
The use of SSRIs/SNRIs has been associated with the development of akathisia, characterised by a subjectively unpleasant or distressing restlessness and need to move often accompanied by an inability to sit or stand still. This is most likely to occur within the first few weeks of treatment. In patients who develop these symptoms, increasing the dose may be detrimental.
Withdrawal symptoms seen on discontinuation of SSRI treatment Withdrawal symptoms when treatment is discontinued are common, particularly if discontinuation is abrupt (see section 4.8). In a recurrence prevention clinical trial with citalopram, adverse events after discontinuation of active treatment were seen in 40% of patients versus 20% in patients continuing citalopram.
The risk of withdrawal symptoms may be dependent on several factors including the duration and dose of therapy and the rate of dose reduction. Dizziness, sensory disturbances (including paraesthesia and electric shock sensations), sleep disturbances (including insomnia and intense dreams), agitation or anxiety, nausea and/or vomiting, tremor, confusion, sweating, headache, diarrhoea, palpitations, emotional instability, irritability, and visual disturbances are the most commonly reported reactions following discontinuation of SSRIs/SNRIs. Generally these symptoms are mild to moderate, however, in some patients they may be severe in intensity. They usually occur within the first few days of discontinuing treatment, but there have been very rare reports of such symptoms in patients who have inadvertently missed a dose. Generally these symptoms are self-limiting and usually resolve within 2 weeks, though in some individuals they may be prolonged (2-3 months or more). It is therefore advised that citalopram should be gradually tapered when discontinuing treatment over a period of several weeks or months, according to the patient’s needs (see section 4.2 "Withdrawal Symptoms Seen on Discontinuation").
QT interval prolongation
Citalopram has been found to cause a dose-dependent prolongation of the QT-interval. Cases of QT interval prolongation and ventricular arrhythmia including torsade de pointes have been reported during the post-marketing period, predominantly in patients of female gender, with hypokalaemia, or with pre-existing QT prolongation or other cardiac diseases (see sections 4.3, 4.5, 4.8, 4.9 and 5.1).
Caution is advised in patients with significant bradycardia; or in patients with recent acute myocardial infarction or uncompensated heart failure.
Electrolyte disturbances such as hypokalaemia and hypomagnesaemia increase the risk for malignant arrhythmias and should be corrected before treatment with citalopram is started.
If patients with stable cardiac disease are treated, an ECG review should be considered before treatment is started.
ECG monitoring may be advisable in case of overdose or conditions of altered metabolism with increased peak levels, e.g. liver impairment.
If signs of cardiac arrhythmia occur during treatment with citalopram, the treatment should be withdrawn and an ECG should be performed.
Angle-closure glaucoma
SSRIs including citalopram may have an effect on pupil size resulting in mydriasis. This mydriatic effect has the potential to narrow the eye angle resulting in increased intraocular pressure and angle-closure glaucoma, especially in patients pre-disposed. Citalopram should therefore be used with caution in patients with angle-closure glaucoma or history of glaucoma.
Paradoxical anxiety
Some patients with panic disorder may experience intensified anxiety symptoms at the start of treatment with antidepressants. This paradoxical reaction usually subsides within the first two weeks of starting treatment. A low starting dose is advised to reduce the likelihood of a paradoxical anxiogenic effect (see section 4.2).
Excipients
Citalopram tablets contain lactose. Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicinal product.
4.5 Interaction with other medicinal products and other forms of interaction
Pharmacodynamic interactions
At the pharmacodynamic level cases of serotonin syndrome with citalopram and moclobemide and buspirone have been reported.
Contraindicated combinations
Monoamine Oxidase Inhibitors (MAOIs)
The simultaneous use of citalopram and MAO-inhibitors can result in severe undesirable effects, including serotonin syndrome (see section 4.3).
Cases of serious, and sometimes fatal reactions, have been reported in patients receiving an SSRI in combination with a monoamine oxidase inhibitor (MAOI), including the selective irreversible MAOI, selegiline, the selective reversible MAOIs linezolid and moclobemide, and in patients who have recently discontinued a SSRI and have been started on a MAOI.
Some cases presented with features resembling serotonin syndrome. Symptoms of an active substance interaction with a MAOI include: agitation, tremor, myoclonus, and hyperthermia.
QT interval prolongation
Pharmacokinetic and pharmacodynamic studies between citalopram and other medicinal products that prolong the QT interval have not been performed. An additive effect of citalopram and these medicinal products cannot be excluded. Therefore, co-administration of citalopram with medicinal products that prolong the QT interval, such as Class IA and III antiarrhythmics, antipsychotics (e.g. fentiazine derivatives, pimozide, haloperidol), tricyclic antidepressants , certain antimicrobial agents (e.g. sparfloxacin, moxifloxacin, erythromycin IV, pentamidine, anti-malarian treatment particularly halofantrine), certain antihistamines (astemizole, mizolastine) etc., is contraindicated.
Pimozide
Co administration of a single dose of pimozide 2 mg to subjects treated with racemic citalopram 40 mg/day for 11 days caused an increase in AUC and Cmax of pimozide, although not consistently throughout the study. The co-administration of pimozide and citalopram resulted in a mean increase in the QTc interval of approximately 10 msec. Due to the interaction noted at a low dose of pimozide, concomitant administration of citalopram and pimozide is contraindicated.
Combinations requiring precaution for use
Selegiline (selective MAO-B inhibitor)
A pharmacokinetic / pharmacodynamic interaction study with concomitantly administered citalopram (20 mg daily) and selegiline (10 mg daily) (a selective MAO-B inhibitor) demonstrated no clinically relevant interactions. The concomitant use of citalopram and selegiline (in doses above 10 mg daily) is contraindicated (see section 4.3).
Serotonergic medicinal products
Lithium and tryptophan
No pharmacodynamic interactions have been found in clinical studies in which citalopram has been given concomitantly with lithium. However there have been reports of enhanced effects when SSRIs have been given with lithium or tryptophan and therefore the concomitant use of citalopram with these medicinal products should be undertaken with caution. Routine monitoring of lithium levels should be continued as normal.
Co-administration with serotonergic medicinal products (e.g. tramadol, oxitriptan, sumatriptan and other triptans) may lead to enhancement of 5-HT associated effects.
In combination with triptans, there is a potential risk of coronary vasoconstriction and hypertension too. Until further information is available, the simultaneous use of citalopram and 5-HT agonists, such as sumatriptan and other triptans, is contraindicated (see section 4.3 and 4.4).
St. John’s wort
Dynamic interactions between SSRIs and the herbal remedy St. Johns wort (Hypericum perforatum) can occur, resulting in an increase in undesirable effects (see section 4.4). Pharmacokinetic interactions have not been investigated.
Haemorrhage
Caution is warranted for patients who are being treated simultaneously with anticoagulants, medicinal products that affect the platelet function, such as non steroidal anti-inflammatory drugs (NSAIDs), acetylsalicylic acid, dipyridamole, and ticlopidine or other medicines (e.g. atypical antipsychotics) that can increase the risk of haemorrhage (see section 4.4).
ECT (electroconvulsive therapy)
There are no clinical studies establishing the risks or benefits of the combined use of electroconvulsive therapy (ECT) and citalopram (see section 4.4).
Alcohol
No adverse pharmacodynamic or pharmacokinetic interactions have been demonstrated between citalopram and alcohol. However, the combination of citalopram and alcohol is not advisable.
Medicinal products inducing hypokalaemia/hypomagnesaemia
Caution is warranted for concomitant use of hypokalaemia/hypomagnesaemia inducing medicinal products as these conditions increase the risk of malignant arrhythmias (see section 4.4).
Medicinal products lowering the seizure threshold
SSRIs can lower the seizure threshold. Caution is advised when concomitantly using other medicinal products capable of lowering the seizure threshold (e.g. antidepressants (SSRIs), neuroleptics (thioxanthenes and butyrophenones), mefloquine, bupropion and tramadol).
Pharmacokinetic interactions
Biotransformation of citalopram to demethylcitalopram is mediated by CYP2C19 (approx. 38%), CYP3A4 (approx. 31%) and CYP2D6 (approx. 31%) isozymes of the cytochrome P450 system. The fact that citalopram is metabolised by more than one CYP means that inhibition of its biotransformation is less likely as inhibition of one enzyme may be compensated by another. Therefore co-administration of citalopram with other medicinal products in clinical practice has very low likelihood of producing pharmacokinetic medicinal product interactions.
Food
The absorption and other pharmacokinetic properties of citalopram have not been reported to be affected by food.
Effect of other medicinal products on the pharmacokinetics of citalopram
Co-administration with ketoconazole (potent CYP3A4 inhibitor) did not change the pharmacokinetics of citalopram.
A pharmacokinetic interaction study of lithium and citalopram did not reveal any pharmacokinetic interactions (see also above).
Cimetidine
Cimetidine (potent CYP2D6, 3A4 and 1A2 inhibitor) caused a moderate increase in the average steady state levels of citalopram. Caution is advised when administering citalopram in combination with cimetidine. Dose adjustment may be warranted.
Co-administration of escitalopram (the active enantiomer of citalopram) with omeprazole 30 mg once daily (a CYP2C19 inhibitor) resulted in moderate (approximately 50%) increase in the plasma concentrations of escitalopram. Thus, caution should be exercised when used concomitantly with CYP2C19 inhibitors (e.g. omeprazole, esomeprazole, fluvoxamine, lansoprazole, ticlopidine). A reduction in the dose of citalopram may be necessary based on monitoring of undesirable effects during concomitant treatment.
Metoprolol
Escitalopram (the active enantiomer of citalopram) is an inhibitor of the enzyme CYP2D6. Caution is recommended when citalopram is co-administered with medicinal products that are mainly metabolised by this enzyme, and that have a narrow therapeutic index, e.g. flecainide, propafenone and metoprolol (when used in cardiac failure), or some CNS acting medicinal products that are mainly metabolised by CYP2D6, e.g. antidepressants such as desipramine, clomipramine and nortriptyline or antipsychotics like risperidone, thioridazine and haloperidol. Dosage adjustment may be warranted. Co-administration with metoprolol resulted in a two-fold increase in the plasma levels of metoprolol but did not statistically significantly increase the effect of metoprolol on the blood pressure and cardiac rhythm.
Effects of citalopram on other medicinal products
A pharmacokinetic / pharmacodynamic interaction study with concomitant administration of citalopram and metoprolol (a CYP2D6 substrate) showed a two fold increase in metoprolol concentrations, but no statistically significant increase in the effect of metoprolol on blood pressure and heart rate in healthy volunteers.
Citalopram and demethylcitalopram are negligible inhibitors of CYP2C9, CYP2E1 and CYP3A4, and only weak inhibitors of CYP1A2, CYP2C19 and CYP2D6 as compared to other SSRIs established as significant inhibitors.
Levomepromazine, digoxin, carbamazepine
No change or only very small changes of no clinical importance were observed when citalopram was given with CYP1A2 substrates (clozapine and theophylline), CYP2C9 (warfarin), CYP2C19 (imipramine and mephenytoin), CYP2D6 (sparteine, imipramine, amitriptyline, risperidone) and CYP3A4 (warfarin, carbamazepine (and its metabolite carbamazepine epoxid) and triazolam).
No pharmacokinetic interaction was observed between citalopram and levomepromazine, or digoxin, (indicating that citalopram neither induces nor inhibits P-glycoprotein).
Desipramine, imipramine
In a pharmacokinetic study no effect was demonstrated on either citalopram or imipramine levels, although the level of desipramine, the primary metabolite of imipramine, was increased. When desipramine is combined with citalopram, an increase of the desipramine plasma concentration has been observed. A reduction of the desipramine dose may be needed.
4.6 Fertility, pregnancy and lactation
Pregnancy
Published data on pregnant women (more than 2500 exposed outcomes) indicate no malformative foeto/neonatal toxicity. However citalopram should not be used during pregnancy unless clearly necessary and only after careful consideration of the risk/benefit.
Neonates should be observed if maternal use of citalopram continues into the later stages of pregnancy, particularly in the third trimester. Abrupt discontinuation should be avoided during pregnancy.
The following symptoms may occur in the neonates after maternal SSRI/SNRI use in later stages of pregnancy: respiratory distress, cyanosis, apnoea, seizures, temperature instability, feeding difficulty, vomiting, hypoglycaemia, hypertonia, hypotonia, hyperreflexia, tremor, jitteriness, irritability, lethargy, constant crying, somnolence and difficulty sleeping. These symptoms could be due to either serotonergic effects or discontinuation symptoms. In a majority of instances the complications begin immediately or soon (<24 hours) after delivery.
Epidemiological data have suggested that the use of SSRIs in pregnancy, particular in late pregnancy, may increase the risk of persistent pulmonary hypertension in the newborn (PPHN). The observed risk was approximately 5 cases per 1000 pregnancies. In the general population 1 to 2 cases of PPHN per 1000 pregnancies occur.
Breast-feeding
Citalopram is excreted into breast milk in small quantities. It is estimated that the suckling infant will receive about 5% of the weight related maternal daily dose (in mg/kg). No or only minor events have been observed in the infants. However, the existing information is insufficient for assessment of the risk to the child. Caution is recommended. If treatment with citalopram is considered necessary, discontinuation of breast feeding should be considered.
Fertility
Animal data have shown that citalopram may affect sperm quality (see section 5.3). Human case reports with some SSRIs have shown that an effect on sperm quality is reversible.
Impact on human fertility has not been observed so far.
4.7 Effects on ability to drive and use machines
Citalopram has minor or moderate influence on the ability to drive and use machines.
Patients who are prescribed psychotropic medication may be expected to have some impairment of general attention and concentration due to the illness itself and psychoactive medicinal products can reduce the ability to make judgements and to react to emergencies. Patients should be informed of these effects and be warned that their ability to drive a car or operate machinery could be affected.
4.8 Undesirable effects
Adverse effects observed with citalopram are in general mild and transient. They are most frequent during the first one or two weeks of treatment and usually attenuate subsequently. The adverse reactions are presented at the MedDRA Preferred Term Level.
For the following reactions a dose-response was discovered: sweating increased, dry mouth, insomnia, somnolence, diarrhoea, nausea and fatigue.
The table shows the percentage of adverse drug reactions associated with SSRIs and/or citalopram seen in either > 1% of patients in double-blind placebo-controlled trials or in the post-marketing period. Frequencies are defined as: very common (>1/10), common (>1/100 to <1/10), uncommon (>1/1000 to <1/100), rare (>1/10,000 to <1/1000), very rare (<1/10,000), and not known (cannot be estimated from the available data).
|
Very Common |
Common |
Uncommon |
Rare |
Not known | |
|
Blood and lymphatic system disorders |
Thrombocytopenia | ||||
|
Immune system disorders |
Hyper-sensitivity, anaphylactic reaction | ||||
|
Endocrine disorders |
Inappropriate ADH secretion | ||||
|
Metabolism and nutrition disorders |
Appetite decreased, weight decreased |
Increased appetite, weight increased |
Hypo- natraemia |
Hypokalaemia | |
|
Psychiatric disorders |
Sleep disorder |
Agitation, impaired concentration, decreased libido, anxiety, nervousness, confusional state, abnormal orgasm (female), abnormal dreams, apathy |
Aggression, depersonalisation, hallucination, euphoria, mania, increased libido |
Panic attack (these symptoms may be due to the underlying disease), bruxism, restlessness, suicidal ideation, suicidal behaviours1 | |
|
Nervous system disorders |
Somnolence, insomnia, headache |
Tremor, paraesthesia, dizziness, disturbance in attention, migraine, amnesia |
Syncope |
Convulsion grand mal, dyskinesia, taste disturbance |
Convulsions, serotonin syndrome, extrapyramidal disorder, akathisia, movement disorder |
|
Eye disorders |
Mydriasis (which may lead to acute narrow angle glaucoma), see section 4.4) |
Visual disturbance | |||
|
Ear and labyrinth disorders |
Tinnitus |
|
Very Common |
Common |
Uncommon |
Rare |
Not known | |
|
Cardiac disorders |
Palpitations |
Bradycardia, tachycardia |
QT-prolongation, ventricular arrhythmia including torsade de pointes | ||
|
Vascular disorders |
Haemorrhage |
Orthostatic hypotension | |||
|
Respiratory, thoracic and mediastinal disorders |
Yawning, rhinitis |
Coushins |
Epistaxis | ||
|
Gastrointestinal disorders |
Dry mouth, nausea |
Diarrhoea, vomiting, constipation, dyspepsia, abdominal pain, flatulence, increased salivation |
Gastrointestinal haemorrhage (including rectal haemorrhage) | ||
|
Hepatobiliary disorders |
Hepatitis |
Liver function test abnormal | |||
|
Skin and subcutaneous tissue disorders |
Increased sweating |
Pruritus |
Urticaria, alopecia, rash, purpura, photosensitivity reaction |
Ecchymosis, angioedema | |
|
Musculoskeleta l and connective tissue disorders |
Myalgia, arthralgia | ||||
|
Renal and urinary disorders |
Urinary retention | ||||
|
Reproductive system and breast disorders |
Impotence, ejaculation disorder, ejaculation failure |
Female: Menorrhagia |
Female: Metrorrhagia Male: Priapism Galactorrhoea | ||
|
General disorders and administration site conditions |
Asthenia |
Fatigue |
Oedema |
Pyrexia, malaise |
Numbers of patients: citalopram / placebo = 1346 / 545
1 Cases of suicidal ideation and suicidal behaviours have been reported during citalopram therapy or early after treatment discontinuation (see section 4.4).
QT interval prolongation
Cases of QT prolongation and ventricular arrhythmia including torsade de pointes have been reported during the post-marketing period, predominantly in patients of female gender, with hypokalemia, or with pre-existing QT prolongation or other cardiac disease (see sections 4.3, 4.4, 4.5, 4.9 and 5.1).
Class effects (bone fractures)
Epidemiological studies, mainly conducted in patients 50 years of age and older, show an increased risk of bone fractures in patients receiving SSRIs and TCAs. The mechanism leading to this risk is unknown.
Withdrawal symptoms seen on discontinuation of SSRI treatment:
Discontinuation of citalopram (particularly when abrupt) commonly leads to withdrawal symptoms. Dizziness, sensory disturbances (including paraesthesia and electric shock sensations), sleep disturbances (including insomnia and intense dreams), agitation or anxiety, nausea and/or vomiting, tremor, confusion, sweating, headache, diarrhoea, palpitations, emotional instability, irritability, and visual disturbances are the most commonly reported reactions. Generally these events are mild to moderate and are self-limiting, however, in some patients they may be severe and/or prolonged. It is therefore advised that when citalopram treatment is no longer required, gradual discontinuation by dose tapering should be carried out (see section 4.2 and section 4.4).
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov .uk/yellowcard.
4.9 Overdose
Toxicity
Comprehensive clinical data on citalopram overdose are limited and many cases involve concomitant overdoses of other drugs/alcohol. Fatal cases of citalopram overdose have been reported with citalopram alone; however, the majority of fatal cases have involved overdose with concomitant medications.
Fatal dose is not known. Patients have survived ingestion of more than 2 g citalopram.
The effects may be potentiated by alcohol taken at the same time.
Potential interaction with TCAs, MAOIs and other SSRIs.
Symptoms
The following symptoms have been seen in reported overdose of citalopram: convulsion, tachycardia, somnolence, seizures, QT interval prolongation, coma, vomiting, tremor, hypotension, cardiac arrest, nausea, serotonin syndrome (particularly when other substances are co-ingested), transpiration, agitation, bradycardia, dizziness, bundle branch block, QRS prolongation, hypertension, mydriasis, torsade de pointes, stupor, sweating, cyanosis, hyperventilation, hyperpyrexia and atrial and ventricular arrhythmia.
ECG changes including nodal rhythm, prolonged QT intervals and wide QRS complexes may occur. Fatalities have been reported.
Prolonged bradycardia with severe hypotension and syncope has also been reported.
Rarely, features of the "serotonin syndrome" may occur in severe poisoning. This includes alteration of mental status, neuromuscular hyperactivity and autonomic instability. There may be hyperpyrexia and elevation of serum creatine kinase. Rhabdomyolysis is rare.
Treatment
There is no known specific antidote to citalopram. Treatment should be symptomatic and supportive and include the maintenance of a clear airway and monitoring of ECG and vital signs until stable.
ECG monitoring is advised in case of overdose in patients with congestive heart failure/bradyarrhythmias, in patients using concomitant medications that prolong the QT interval, or in patients with altered metabolism, e.g. liver impairment.
Consider oral activated charcoal in adults and children who have ingested more than 5 mg/kg body weight within 1 hour. Activated charcoal given hour after ingestion of citalopram has
been shown to reduce absorption by 50%.
Osmotically working laxative (such as sodium sulphate) and stomach evacuation should be considered.
If consciousness is impaired the patient should be intubated.
Control convulsions with intravenous diazepam if they are frequent or prolonged.
5 PHARMACOLOGICAL PROPERTIES
5.1 Pharmacodynamic properties
Pharmacotherapeutic group: antidepressants, selective serotonin reuptake inhibitors ATC code: N 06A B04.
Mechanism of action
Biochemical and behavioural studies have shown that citalopram is a potent inhibitor of serotonin (5-HT) - uptake. Long-term treatment with citalopram does not induce tolerance to the inhibition of 5-HT-uptake.
Citalopram is a very Selective Serotonin Reuptake Inhibitor (SSRI) with no, or minimal, effect on noradrenaline (NA), dopamine (DA) and gamma aminobutyric acid (GABA) uptake.
In contrast to many tricyclic antidepressants and some of the newer SSRIs, citalopram has no or very low affinity for a series of receptors including 5-HT1A, 5-HT2, dopamine D1 and D2 receptors, a1-, a2- and P-adrenoceptors, histamine H1, muscarine cholinergic, benzodiazepine, and opioid receptors. This is in contrast to many tricyclic antidepressants and some of the other SSRI’s. Lack of receptor affinity has been confirmed using a series of functional in vitro tests in isolated organs as well as functional in vivo tests. This absence of effects on receptors could explain why citalopram produces fewer of the traditional side effects such as dry mouth, bladder and gut disturbance, blurred vision, sedation, cardiotoxicity and orthostatic hypotension.
The main metabolites of citalopram are all SSRIs although their potency and selectivity ratios are lower than those of citalopram. However, the selectivity ratios of the metabolites are higher than those of newer SSRIs. The metabolites do not contribute to the overall antidepressant effect.
Pharmacodynamic effects
Like tricyclic antidepressants, other SSRI’s and MAO inhibitors, citalopram suppresses REM-sleep and increases deep slow-wave sleep. Suppression of rapid eye movement (REM) sleep is considered a predictor of antidepressant activity. Although citalopram does not bind to opioid receptors it potentiates the anti-nociceptive effect of commonly used opioid analgesics. There was potentiation of d-amphetamine-induced hyperactivity following administration of citalopram.
In humans citalopram does not impair cognitive (intellectual function) and psychomotor performance and has no or minimal sedative properties, either alone or in combination with alcohol.
Citalopram did not reduce saliva flow in a single dose study in human volunteers and in none of the studies in healthy volunteers did citalopram have significant influence on cardiovascular parameters. Citalopram has no effect on the serum levels of prolactin and growth hormone.
Clinical efficacy and Safety
In a double-blind, placebo-controlled ECG study in healthy subjects, the change from baseline in QTc (Fridericia-correction) was 7.5 (90%CI 5.9-9.1) msec at the 20 mg/day dose and 16.7 (90%CI 15.0-18.4) msec at the 60 mg day/dose (see sections 4.3, 4.4, 4.5, 4.8 and 4.9).
5.2 Pharmacokinetic properties
Absorption
Absorption is almost complete and independent of food intake (Tmax average/mean 3.8 hours). Oral bioavailability is about 80%.
Distribution
The apparent volume of distribution (Vd)B is about 12.3 L/kg. The plasma protein binding is below 80% for citalopram and its main metabolites.
Biotransformation
Citalopram is metabolised to the active demethylcitalopram, didemethylcitalopram, citalopram-N-oxide and an inactive deaminated proprionic acid derivative. All the active metabolites are also SSRIs, although weaker than the parent compound. Unchanged citalopram is the predominant compound in plasma. The main metabolising enzyme is CYP2C19. Some contribution from CYP3A4 and CYP2D6 is possible.
Elimination
The elimination half-life (T1/2 b) is about 1.5 days and the systemic citalopram plasma clearance (CIs) is about 0.33 L/min, and oral plasma clearance (CIoral) is about 0.41 L/min.
Citalopram is excreted mainly via the liver (85%) and the remainder (15%) via the kidneys. About 12% of the daily dose is excreted in urine as unchanged citalopram. Hepatic (residual) clearance is about 0.35 L/min and renal clearance about 0.068 L/min.
The kinetics is linear. Steady state plasma levels are achieved in 1-2 weeks. Average concentrations of 250 nmol/L (100-500 nmol/L) are achieved at a daily dose of 40 mg. There is no clear relationship between citalopram plasma levels and therapeutic response or side effects.
Elderly patients (f65 years): Longer half-lives and decreased clearance values due to a reduced rate of metabolism have been demonstrated in elderly patients.
Hepatic impairment
Citalopram is eliminated more slowly for patients with reduced hepatic function. The half-life of citalopram is about twice as long and steady state citalopram concentrations at a given dose will be about twice as high as in patients with normal liver function.
Renal impairment
Citalopram is eliminated more slowly in patients with mild to moderate reduction of renal function, without any major impact on the pharmacokinetics of citalopram. At present no information is available for treatment of patients with severely reduced renal function (creatinine clearance <20 mL/min).
5.3 Preclinical safety data
Acute toxicity
Citalopram has low acute toxicity.
Chronic toxicity
In chronic toxicity studies there were no findings of concern for the therapeutic use of citalopram.
Reproduction studies
Based on data from reproduction toxicity studies (segment I, II and III) there is no reason to have special concern for the use of citalopram in women of child-bearing potential.
Phospholipidosis in several organs was observed in repeated dose toxicity studies in rats.
This reversible effect is known for several lipophilic amines and was not connected with morphological and functional effects. The clinical relevance is not clear.
Embryotoxicity studies in rats have shown skeletal anomalies at maternal toxic doses. The effects may be related to the pharmacological activity or could be an indirect effect due to maternal toxicity. Peri- and postnatal studies have revealed reduced survival in offspring during the lactation period. The potential risk for humans is unknown.
Animal data have shown that citalopram induces a reduction of fertility index and pregnancy index, reduction in number in implantation and abnormal sperm at exposure well in excess of human exposure.
Mutagenic and carcinogenic potential
Citalopram has no mutagenic or carcinogenic potential.
6 PHARMACEUTICAL PARTICULARS
6.1 List of excipients
Tablet Core
Lactose monohydrate
Maize starch
Cellulose, microcrystalline Povidone Crospovidone Magnesium stearate
Tablet Coating
Titanium dioxide (E171) Lactose monohydrate Macrogol 4000 Hypromellose (E464)
6.2 Incompatibilities
Not applicable
6.3 Shelf life
2 years
6.4 Special Precautions for Storage
This medicinal product does not require any special storage conditions.
6.5 Nature and contents of container
PVC/PVdC blisters sealed with aluminium foil (also includes unit dose packs). Pack sizes of 10, 12, 14, 20, 28, 30, 49, 50, 56, 60, 98, 100 or 500 tablets.
PVC/PVdC blisters sealed with aluminium foil. Calendar pack size of 28 tablets.
High Density Polyethylene (HDPE) containers with polypropylene (PP) caps. Pack sizes of 12, 14, 20, 28, 50, 100 or 250 tablets.
Polypropylene tablet containers with polyethylene caps. Pack sizes of 12, 14, 20, 28, 50, 100 or 250 tablets.
Not all pack sizes may be marketed.
6.6 Special precautions for disposal and other handling
No special requirements.
7 MARKETING AUTHORISATION HOLDER
Generics [UK] Limited t/a Mylan
Station Close
Potters Bar
Hertfordshire
EN6 1TL
United Kingdom
8. MARKETING AUTHORISATION NUMBER
PL 04569/0480
9 DATE OF FIRST AUTHORISATION/RENEWAL OF THE AUTHORISATION
09/01/2007
10 DATE OF REVISION OF THE TEXT
13/11/2015