NIFEDIPINE oral

Prescription under medical supervision

Therapeutic action

– Uterine relaxant

Indications

– Threatened premature labour

Forms and strengths

– 10 mg immediate-release soft capsule or tablet

Dosage and duration

– 10 mg by oral route, to be repeated every 15 minutes if uterine contractions persist (max. 4 doses or 40 mg), then 20 mg by oral route every 6 hours 
The total duration of treatment is 48 hours.

Contra-indications, adverse effects, precautions

– Do not administer to patients with severe cardiac disease (recent myocardial infarction, unstable angina).
– Do not administer if systolic blood pressure is below 90 mmHg.
– May cause:
• headache, flushing, peripheral oedema (common adverse effects at the start of treatment);
• dizziness, hypotension, tachycardia, nausea, gingival hyperplasia, rash.
– Stop nifedipine if ischaemic chest pain occurs or existing pain increases after starting treatment.
– Do not combine with magnesium sulphate, salbutamol IV, and other calcium channel blockers.
– Monitor combination with cimetidine (enhances hypotensive effects), phenytoin (risk of phenytoin overdose), rifampicin (efficacy of nifedipine diminished), itraconazole (increased risk of oedema), beta-blockers (increased adverse cardiac effects).
 PregnancyCONTRA-INDICATED during the first trimester. Never administer sublingually (risk of foetal death from placental hypoperfusion).
– Breast-feeding: avoid

Remarks

– Nifedipine is a calcium channel blocker that is also used in the management of hypertension at doses of 10 to 40 mg 2 times daily or 20 to 90 mg once daily, depending on the sustained-release form used. Immediate-release forms of nifedipine should not be used in either long-term treatment of hypertension or treatment of hypertensive crisis (risk of excessive fall in blood pressure and cerebral or myocardial ischaemia in patients with coronary artery disease).
– Storage: below 25 °C -