Naftidrofuryl Oxalate 100mg Capsules
SUMMARY OF PRODUCT CHARACTERISTICS
1 NAME OF THE MEDICINAL PRODUCT
Naftidrofuryl Oxalate 100mg Capsules
2 QUALITATIVE AND QUANTITATIVE COMPOSITION
Each capsule contains 100mg naftidrofuryl oxalate equivalent to 81.0 mg naftidrofuryl and 19.0 mg oxalate.
For the full list of excipients, see section 6.1
3. PHARMACEUTICAL FORM
Capsule
4 CLINICAL PARTICULARS
4.1 Therapeutic indications
Peripheral vascular disorders - intermittent claudication, night cramps, rest pain, incipient gangrene, trophic ulcers, Raynaud’s Syndrome, diabetic arteriopathy and acrocyanosis.
4.2 Posology and method of administration
Posology:
One or two capsules three times daily for a minimum of three months, or at the discretion of the physician.
Method of administration:
For oral administration. The capsules should be swallowed whole during meals with a sufficient amount of water (minimum) of one glass.
Paediatric _populationThe safety and efficacy of Naftidrofuryl oxalate in the paediatric population have not been established. This drug is not indicated for use in children.
4.3
Contraindications
Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.
Patients with a history of hyperoxaluria or recurrent calcium-containing kidney stones.
4.4 Special warnings and precautions for use
The administration of Naftidrofuryl oxalate may modify the composition of the urine, promoting the formation of calcium oxalate kidney stones (the oxalate content is 19 mg per 100 mg of active ingredient).
A sufficient amount of liquid should be taken during treatment to maintain an adequate level of diuresis.
The administration of Naftidrofuryl oxalate without liquid before going to bed may cause local oesophagitis. Therefore, it is essential to always take the capsule with a sufficient amount of water.
Cases of liver damage have been reported. In the event of symptoms suggesting liver damage, Naftidrofuryl oxalate must be discontinued.
4.5. Interaction with other Medicinal Products and other Forms of Interaction
None known.
4.6 Fertility, pregnancy and lactation
Pregnancy
In the absence of any relevant clinical data, the use of Naftidrofuryl oxalate is not advisable during pregnancy.
Breast-Feeding
In the absence of specific data concerning the excretion of the drug in human milk, Naftidrofuryl oxalate should not be used by breast-feeding women.
4.7. Effects on Ability to Drive and Use Machines
None known.
4.8
Undesirable effects
According to information collected during clinical trials and spontaneous reports since marketing authorisation, the following undesirable effects may occur under treatment with naftidrofuryl.
The following definitions apply to the frequency terminology used hereafter:
very common >1/10
common >1/100, <1/10
uncommon >1/1,000, <1/100
rare >1/10,000, <1/1,000
very rare <1/10,000
frequency not known: cannot be estimated from the available data Gastro-intestinal disorders:
Uncommon: Diarrhoea, nausea, vomiting and epigastric pain.
Frequency not known: In some patients who took the medicinal product without liquid before going to bed, the capsule being stuck in the throat led to local oesophagitis.
Renal and urinary disorders:
Very rare: Calcium oxalate kidney stones (see section 4.4).
Skin and subcutaneous tissue disorders:
Uncommon: Skin rash.
Hepatobiliary disorders:
Rare: Liver damage
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
Signs and symptoms: Depression of cardiac conduction and convulsions may occur.
Treatment: The stomach should be emptied by gastric lavage and emesis. Activated charcoal may be employed if necessary. Cardiovascular function and respiration should be monitored and, in severe cases, electrical pacemaking or the use of isoprenaline should be considered. Convulsions may be managed by diazepam.
5.1 Pharmacodynamic properties
Pharmacotherapeutic group: peripheral vasodilator, ATC code: C04AX21.
Naftidrofuryl oxalate has been shown to exert a direct effect on intracellular metabolism. Thus it has been shown in man and animals that it produces an increase of ATP levels and a decrease of lactic acid levels in ischaemic conditions, evidence for an enhancement of cellular oxidative capacity. Furthermore, naftidrofuryl oxalate is a powerful spasmolytic agent.
5.2. Pharmacokinetic Properties
Naftidrofuryl oxalate is well absorbed when given orally. Peak plasma levels occur about 30 minutes after dosing and the half life is about an hour, although intersubject variation is relatively high. Cumulation does not occur at a dose level of 200mg three times daily.
The drug becomes extensively bound to plasma proteins and is excreted principally via the urine, all in the form of metabolites.
5.3. Pre-clinical Safety Data
No toxic effects were seen in animal studies which provide additional information to that obtained in man. In repeated dose studies the no effect level was 25mg/kg/day or greater. There was no evidence of effects on reproduction below doses which caused maternal toxicity.
6. PHARMACEUTICAL PARTICULARS 6.1. List of Excipients
Talc
Magnesium Stearate Purified Water*
Denatured Ethanol*
Capsule Shells:
Erythrosine (E127)
Titanium Dioxide (E171)
Printing ink (containing iron oxide black E172) Gelatine
*Not present in final product
6.2. Incompatibilities
None known.
6.3 Shelf life
36 months.
6.4. Special Precautions for Storage
Store below 25°C in a dry place away from light.
6.5 Nature and contents of container
Pack size 10 (medical sample), 21 and 84 capsules:-
Cardboard carton containing blister strips comprising heat-sealable PVC
(250pm) and aluminium foil (30pm).
Pack size 100 and 500:
Polyethylene securitainers with tamper evident closures.
Not all pack sizes may be marketed.
6.6 Special precautions for disposal
No special requirements for disposal.
7. MARKETING AUTHORISATION HOLDER
Merck Sante s.a.s.
37 Rue Saint Romain 69379 Lyon Cedex 08 FRANCE
8. MARKETING AUTHORISATION NUMBER(S)
PL 13466/0002
9. DATE OF FIRST AUTHORISATION / RENEWAL OF AUTHORISATION
13 May 1996
10
DATE OF REVISION OF THE TEXT
10/10/2016