Norfan (Amlodipine)

Amlodipine acts on the vascular smooth‑muscle calcium channels to manage cardiovascular conditions.

• Hypertension: lowers elevated blood pressure and reduces cardiovascular risk.
• Chronic stable angina: improves chest‑pain symptoms by increasing coronary blood flow.
• Coronary artery disease (as part of anti‑anginal therapy): helps relieve ischemic discomfort and enhances exercise tolerance.

• Amlodipine selectively inhibits L‑type calcium channels in vascular smooth muscle and cardiac myocytes, decreasing calcium influx. This results in arterial vasodilation, reduced peripheral vascular resistance, and modest negative inotropic effect, thereby lowering systemic blood pressure and improving myocardial oxygen supply during angina.

Amlodipine may cause a range of adverse reactions, most of which are mild and reversible.

Common Side Effects

• Headache: mild to moderate pain often occurring early in therapy.
• Peripheral edema: swelling of ankles or lower legs due to fluid accumulation.
• Flushing: transient warmth and redness of the face or neck.
• Dizziness: sensation of light‑headedness, especially when standing quickly.

Serious or Rare Side Effects

• Severe hypotension: marked drop in blood pressure that may cause fainting.
• Myocardial infarction: rare occurrence of heart attack during treatment.
• Arrhythmias: abnormal heart rhythms requiring medical evaluation.
• Hepatic dysfunction: signs of liver injury such as jaundice.
• Allergic reactions: rash, itching, or swelling of the face and throat.
• Stevens‑Johnson syndrome: severe skin reaction, extremely rare.

Before initiating therapy, clinicians should assess patient‑specific factors and monitor for potential complications.

• Blood pressure monitoring: check regularly to ensure therapeutic targets are met.
• Hepatic impairment: consider dose adjustment or close observation in patients with liver disease.
• Heart failure: use cautiously; monitor for worsening edema.
• Elderly patients: start at lower dose and titrate slowly due to increased sensitivity.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Amlodipine can interact with several medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Simultaneous use with strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin) may markedly increase plasma concentrations.
• Co‑administration with other potent antihypertensives can cause excessive blood‑pressure lowering.
• Concurrent use with grapefruit juice can elevate amlodipine levels.

Moderate Interactions (Monitor Closely)

• Combination with CYP3A4 inducers (e.g., rifampicin, carbamazepine) may reduce therapeutic effect.
• Use with beta‑blockers may require careful heart‑rate monitoring.
• Interaction with statins metabolized by CYP3A4 (e.g., simvastatin) may increase statin exposure; dose adjustment may be needed.