I am currently taking amlodipine 2.5 mg daily; how should I adjust my antihypertensive therapy to reach target blood pressure?

Increase Your Amlodipine Dose to 5 mg Daily

You should increase your amlodipine from 2.5 mg to 5 mg once daily, as 2.5 mg is a subtherapeutic starting dose typically reserved only for elderly, frail, or hepatically impaired patients. The standard initial antihypertensive dose is 5 mg daily, with a maximum of 10 mg daily for most adults 1.

Dose Titration Strategy

Your current 2.5 mg dose is below the evidence-based therapeutic range. Here's how to proceed:

Immediate Action:

• Increase to 5 mg once daily now 1
• This is the recommended starting dose for most adults and the minimum effective dose demonstrated in clinical trials 2

Timeline for Assessment:

• Wait 7-14 days between dose adjustments to assess response 1
• Achieve target blood pressure within 3 months of starting therapy 3
• Do not increase dose before 4-6 weeks unless clinically urgent, as amlodipine takes time to reach steady state 4

If BP Remains Uncontrolled on 5 mg:

• After 4-6 weeks, increase to 10 mg once daily if needed 1, 4
• Studies show 73% of patients reach target BP with 10 mg versus only 56% with 5 mg 5

When to Add a Second Agent

If you don't reach target BP on amlodipine 10 mg alone, add a second first-line agent rather than continuing monotherapy 6, 7, 8:

Preferred Combinations (in order):

1. Amlodipine + ACE inhibitor or ARB (Grade A evidence) 7, 8
2. Amlodipine + thiazide/thiazide-like diuretic (Grade B evidence) 6, 7

The 2024 ESC guidelines 8 and 2020 ISH guidelines 3 recommend starting with combination therapy for most patients with confirmed hypertension ≥140/90 mmHg, preferably as a single-pill combination to improve adherence.

Target Blood Pressure

Your goal depends on your cardiovascular risk:

• High CVD risk (diabetes, CKD, CVD, organ damage): Target <130/80 mmHg 9, 8
• Standard risk: Target <140/90 mmHg 3, 7
• Optimal target if tolerated: 120-129 mmHg systolic 8

Clinical Pearls

Why 2.5 mg is inadequate:

• Clinical trials show 2.5 mg produces minimal BP reduction compared to placebo 5, 2
• The FDA label explicitly states 2.5 mg is only for "small, fragile, or elderly patients, or patients with hepatic insufficiency" 1
• Dose-response studies demonstrate clear superiority of 5 mg and 10 mg over lower doses 5, 2

Advantages of amlodipine:

• Long half-life (35-50 hours) provides 24-hour BP control even if you miss a dose 10
• Reduces BP variability better than other agents 10
• Safe in chronic kidney disease without dose adjustment 10
• Once-daily dosing improves adherence 8

Common side effects to monitor:

• Peripheral edema (more common at 10 mg dose)
• Flushing, palpitations, dizziness 10
• These are generally mild and dose-dependent

Avoid these pitfalls:

• Don't increase dose before 4 weeks unless BP is severely elevated 4
• Don't combine with a non-dihydropyridine CCB (diltiazem/verapamil) + beta-blocker (risk of heart block) 6, 7
• Don't use amlodipine monotherapy indefinitely if target BP isn't reached—add a second agent 6, 8