Amlodipine Dosing for Hypertension
Start amlodipine at 5 mg once daily for most adults with hypertension, with titration to 10 mg once daily if blood pressure remains uncontrolled after 7-14 days; elderly, frail, or hepatically impaired patients should begin at 2.5 mg once daily. 1
Initial Dosing Strategy
The FDA-approved starting dose is 5 mg once daily for typical adult patients 1. This represents the minimum effective dose that produces clinically meaningful blood pressure reduction, as demonstrated in dose-ranging studies 2, 3.
For special populations requiring lower initial doses (2.5 mg once daily):
- Elderly patients (≥65 years, particularly ≥85 years)
- Frail patients with moderate-to-severe frailty
- Patients with hepatic insufficiency
- Small or fragile patients
- Those with symptomatic orthostatic hypotension
- When adding amlodipine to existing antihypertensive therapy 1, 4
The rationale for lower starting doses in elderly patients is pharmacokinetic: they demonstrate 40-60% higher drug exposure (AUC) due to decreased clearance 1.
Titration Protocol
Timing: Wait 7-14 days between dose adjustments under typical circumstances 1. However, titrate more rapidly if clinically warranted, provided frequent patient assessment occurs.
Target dose: The maximum dose is 10 mg once daily 1. Most patients require 10 mg for adequate blood pressure control and cardiovascular protection 1, 5.
Important caveat: Research demonstrates that early dose escalation (at 2 weeks) provides no advantage over waiting 6 weeks 6. The blood pressure reduction continues progressively through week 6, so premature uptitration is unnecessary and may increase side effects without benefit.
Integration with Current Guidelines
Amlodipine functions as a dihydropyridine calcium channel blocker (DHP-CCB) in guideline-recommended treatment algorithms:
For non-Black patients: Amlodipine is typically added as second-line therapy after initiating an ACE inhibitor or ARB, then titrated to full dose before adding a third agent 7.
For Black patients: Amlodipine serves as first-line therapy, either alone or combined with an ARB or thiazide diuretic, then increased to full dose 7.
Combination therapy considerations: The 2024 ESC guidelines recommend combination therapy as initial treatment for most patients with confirmed hypertension (BP ≥140/90 mmHg), with exceptions for those ≥85 years, moderate-to-severe frailty, or symptomatic orthostatic hypotension 4. When combining amlodipine with other agents, the same dosing principles apply, though starting at 2.5 mg may be appropriate when initiating dual therapy.
Monitoring and Adjustment
Target achievement timeline: Blood pressure should reach goal within 3 months 7. The 2020 ISH guidelines specify reducing BP by at least 20/10 mmHg, ideally to <140/90 mmHg, with individualization for elderly based on frailty 7.
Efficacy by dose: Studies demonstrate dose-dependent blood pressure reduction:
- 2.5 mg: minimum effective dose (41% reach target BP)
- 5 mg: 56% reach target BP
- 10 mg: 73% reach target BP 3
When patients fail to respond to 5 mg, uptitration to 10 mg produces additional significant reductions of approximately 12-13 mmHg systolic and 7-8 mmHg diastolic across age groups 8.
Safety Considerations
Common side effects are dose-related and include pedal edema (more common in women), palpitations, dizziness, and flushing—all more frequent at 10 mg 9, 10.
Key advantage: Amlodipine's long half-life (35-50 hours) maintains antihypertensive effect beyond 24 hours, providing continuous protection even with missed doses 10. This pharmacokinetic profile supports true once-daily dosing and reduces blood pressure variability.
Contraindications: Avoid in pregnancy (Category C) and use caution in heart failure with reduced ejection fraction (HFrEF), though amlodipine or felodipine may be used if required 9, 1.