Amlodipine Dosing for Hypertension
Start amlodipine at 5 mg once daily for most adults with hypertension, with a maximum dose of 10 mg once daily; reduce the starting dose to 2.5 mg once daily in older adults, frail patients, and those with hepatic insufficiency. 1
Standard Dosing in Adults
- Initial dose: 5 mg once daily is the usual starting dose for hypertension in most adult patients 1
- Maximum dose: 10 mg once daily 1
- Titration schedule: Wait 7 to 14 days between dose adjustments to observe full response, though more rapid titration is acceptable if clinically warranted with frequent patient assessment 1
- Dose escalation: If blood pressure control is inadequate on 5 mg, uptitrate to 10 mg once daily 1, 2
The evidence demonstrates that titration from 5 mg to 10 mg produces significant additional blood pressure reductions (systolic BP reduction of approximately 12-13 mmHg and diastolic BP reduction of 7-8 mmHg), with 40-46% of patients achieving blood pressure goals after uptitration 2. Dose-response studies confirm that 10 mg achieves target blood pressure in 73% of patients compared to 56% with 5 mg 3.
Dose Adjustments in Special Populations
Older Adults (Elderly Patients)
Start at 2.5 mg once daily in elderly patients 1. This lower starting dose is recommended because:
- Elderly patients have decreased clearance of amlodipine, resulting in 40-60% higher drug exposure (AUC) 1
- The terminal elimination half-life is prolonged in this population 1
- Despite lower starting doses, efficacy remains excellent—patients aged ≥55 years achieve significant blood pressure reductions (systolic BP -12.1 mmHg, diastolic BP -6.7 mmHg) when uptitrated to 10 mg 2
The 2020 International Society of Hypertension guidelines emphasize simplifying regimens with once-daily dosing in patients aged >80 years or those who are frail, and individualizing blood pressure targets based on frailty status 4.
Hepatic Insufficiency
Start at 2.5 mg once daily in patients with liver disease 1. This reduced starting dose is critical because:
- Amlodipine undergoes extensive hepatic metabolism (approximately 90% converted to inactive metabolites) 1
- Patients with hepatic insufficiency demonstrate 40-60% increased drug exposure due to decreased clearance 1
- Recent evidence suggests amlodipine may induce liver inflammation through gut microbiome alterations and increase intestinal permeability, leading to elevated lipopolysaccharide translocation 5
- Cases of severe liver injury have been reported with amlodipine overdose 6
Small or Fragile Patients
Start at 2.5 mg once daily in small or fragile patients, which can also be used when adding amlodipine to existing antihypertensive therapy 1.
Clinical Context and Combination Therapy
Amlodipine (a dihydropyridine calcium channel blocker) is recommended as first-line therapy for hypertension, particularly in Black patients where it should be combined with an ARB or thiazide-like diuretic 4, 7. The 2024 ESC guidelines recommend combination therapy for most patients with confirmed hypertension (BP ≥140/90 mmHg) as initial treatment, preferably using fixed-dose single-pill combinations 7.
Important Caveats
- No renal dose adjustment needed: Amlodipine pharmacokinetics are not significantly influenced by renal impairment, so patients with renal failure can receive the usual initial dose 1
- Monitoring for adverse effects: The most common side effects are peripheral edema (13.8%), headache (7.8%), and rashes (3.8%) 8
- Drug interactions: Strong CYP3A4 inhibitors (itraconazole, clarithromycin) may significantly increase amlodipine concentrations; dose reduction may be necessary 1
- Sex differences: Women typically require lower doses and achieve higher dose-adjusted concentrations than men, with half the likelihood of uncontrolled hypertension 9