Nicardipine (Calcium‑channel blocker)
Below are the typical adult dosing ranges used in the United States. Always refer to the specific product label or consult a prescribing physician for individualized therapy, especially in patients with renal or hepatic impairment, pregnancy, or concomitant drug therapy.
| Indication | Formulation | Typical Starting Dose | Titration | Max Daily Dose | Notes |
|------------|-------------|----------------------|-----------|----------------|-------|
| Acute Hypertensive Crisis (IV infusion) | 0.5 mg/min (≈ 30 mg/hr) | 0.5 mg/min (continuous infusion) | Titrate every 15 min to maintain BP 10–15 % lower than baseline; max 12 mg/hr (≈ 720 mg/day) | 12 mg/hr (≈ 720 mg/day) | Use in ICU or cath lab. Monitor BP and pulse every 5–15 min. Slow titration to avoid reflex tachycardia. |
| Acute Coronary Syndrome / Angina (IV) | 0.5 mg/min | Same as above | Same as above | 12 mg/hr | Rapid reduction in afterload improves coronary perfusion. |
| Chronic Hypertension / Angina (oral) | 10 mg PO twice daily (BID) | 10 mg BID | Increase by 10 mg BID every 3–7 days to effective level | 80 mg/day (e.g., 20 mg BID or 10 mg TID) | Preferred as extended‑release tablets. 2‑step titration: 10 mg BID → 20 mg BID → 30 mg BID, etc. |
| Peripheral Arterial Disease | 5 mg PO BID | 5 mg BID | Increase to 10 mg BID, then 20 mg BID as needed | 40 mg/day | 10 mg BID is common for intermittent claudication. |
| Pediatric (≥ 2 y) | 1 mg PO daily | 1 mg/day | Increase to 2 mg/day if tolerated | 2 mg/day | Limited data; use with caution. |
| Geriatric | Same as adults | Start at lower end (10 mg BID) | Titrate cautiously | Same as adults | Monitor for orthostatic hypotension and bradycardia. |
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Key Points & Precautions
1. Start Low, Go Slow
- Especially for IV nicardipine, titrate over minutes to avoid sudden reflex tachycardia or excessive drop in systolic BP.
2. Contraindications
- Severe aortic stenosis, cardiogenic shock, decompensated heart failure, or significant bradycardia.
3. Drug Interactions
- CYP3A4 inhibitors (ketoconazole, ritonavir) ↑ nicardipine levels.
- CYP3A4 inducers (rifampin, carbamazepine) ↓ efficacy.
- Concomitant use with other antihypertensives (beta‑blockers, ACE inhibitors) may potentiate hypotension.
4. Monitoring
- IV: BP and heart rate every 5–15 min until stable, then hourly.
- Oral: BP at baseline, 2–3 hours after first dose, then weekly until stable.
- Watch for edema, flushing, headache, and palpitations.
5. Special Populations
- Renal: No dose adjustment needed; monitor for fluid overload.
- Hepatic: Mild‑moderate impairment – start lower, monitor levels.
- Pregnancy: Category C. Use only if benefits outweigh risks.
- Breastfeeding: Not recommended; minimal data.
6. Side‑Effect Profile
- Common: Reflex tachycardia, headache, flushing, edema.
- Rare: Bradycardia, hypotension, drug‑induced gingival hyperplasia (long‑term use).
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Practical Example
A 65‑year‑old man with uncontrolled hypertension (BP 210/120 mm Hg) is admitted with an acute hypertensive crisis.
- IV Nicardipine:
- Start 0.5 mg/min continuous infusion.
- Every 15 min, assess BP and pulse.
- If systolic BP falls >10 % below baseline, reduce the rate by 0.1 mg/min.
- Once BP is 10–15 % lower than baseline and pulse is acceptable, transition to an oral extended‑release tablet (10 mg BID) once stabilized.
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Bottom Line: Nicardipine is highly effective for both acute and chronic hypertension, but its dosing must be carefully titrated, especially when administered intravenously. Always consult the latest prescribing information and adjust based on patient response and comorbidities.