Nifedipine Sandoz (Nifedipine)

Nifedipine is used to manage cardiovascular conditions that involve excessive vascular tone or myocardial oxygen demand.

• Hypertension: lowers elevated blood pressure by relaxing arterial smooth muscle.
• Angina pectoris: reduces chest pain by decreasing cardiac workload and improving coronary blood flow.
• Raynaud's phenomenon: alleviates vasospastic attacks in peripheral arteries, improving blood flow to the fingers and toes.

• Nifedipine selectively blocks L‑type calcium channels in vascular smooth muscle and cardiac myocytes. This inhibition reduces calcium influx, leading to vasodilation of peripheral arteries and decreased myocardial contractility, which together lower systemic vascular resistance and myocardial oxygen consumption.

Nifedipine may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Headache: mild to moderate pain often occurring shortly after dosing.
• Flushing: transient warmth and redness of the skin.
• Peripheral edema: swelling of the ankles or lower legs.
• Dizziness: sensation of light‑headedness, especially when standing.
• Tachycardia: increased heart rate as a reflex response.
• Nausea: mild gastrointestinal upset.

Serious or Rare Side Effects

• Severe hypotension: marked drop in blood pressure that may cause fainting.
• Myocardial infarction: rare occurrence of heart attack, particularly in patients with pre‑existing coronary disease.
• Allergic reactions: rash, itching, or anaphylaxis.
• Liver dysfunction: elevated liver enzymes indicating hepatic injury.
• Atrioventricular block: abnormal heart rhythm requiring medical attention.
• Seizures: rare neurologic events.

Before prescribing Nifedipine, clinicians should consider several safety measures.

• Blood pressure monitoring: regularly assess to avoid excessive hypotension.
• Hepatic impairment: adjust use in patients with liver disease due to altered metabolism.
• Abrupt discontinuation: taper gradually to prevent rebound hypertension.
• Heart failure: use cautiously as rapid vasodilation may worsen symptoms.
• Concomitant antihypertensives: evaluate for additive blood‑pressure‑lowering effects.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Nifedipine can interact with other medicines, influencing its efficacy or safety.

Major Interactions (Avoid)

• Strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin): may increase nifedipine plasma levels and risk of toxicity.
• Grapefruit juice: can markedly raise drug concentrations.
• Simultaneous use with other potent vasodilators: may cause severe hypotension.

Moderate Interactions (Monitor Closely):\n- CYP3A4 inducers (e.g., rifampicin, carbamazepine): may reduce therapeutic effect.

• Beta‑blockers: additive heart‑rate‑lowering effect.
• Diuretics: enhanced blood‑pressure reduction.
• NSAIDs: may blunt antihypertensive response.
• Antidiabetic agents: monitor glucose as blood‑pressure changes can affect glycemic control.