What is the recommended adult dose of the fixed‑dose combination tablet containing losartan 50 mg and amlodipine 5 mg for hypertension?

Losartan 50 mg + Amlodipine 5 mg Fixed-Dose Combination Dosing

The recommended adult dose of the fixed-dose combination tablet containing losartan 50 mg and amlodipine 5 mg is one tablet once daily, which can be titrated to higher doses (losartan 100 mg/amlodipine 10 mg) if blood pressure remains uncontrolled after 2-4 weeks. 1, 2

Standard Dosing Regimen

• Initial therapy: One tablet of losartan 50 mg/amlodipine 5 mg once daily, taken without regard to food 1, 3
• Titration schedule: If blood pressure target (<130/80 mmHg) is not achieved after 2-4 weeks, increase to losartan 100 mg/amlodipine 10 mg once daily 1, 2, 4
• Maximum dose: Losartan 100 mg/amlodipine 10 mg once daily 1, 3

When to Use This Combination

This fixed-dose combination is particularly recommended for patients with stage 2 hypertension (BP ≥140/90 mmHg or >20/10 mmHg above target), as initiating therapy with two first-line agents from different classes achieves faster blood pressure control and improves adherence. 5, 2

• Fixed-dose combinations demonstrate greater blood pressure lowering than single agents and better long-term adherence 5, 2
• The combination of an ARB (losartan) and a calcium channel blocker (amlodipine) provides complementary mechanisms: losartan blocks the renin-angiotensin system while amlodipine causes vasodilation 6
• Amlodipine prevents losartan-related compensatory increases in renin, while losartan reduces amlodipine-induced peripheral edema 6

Clinical Efficacy Evidence

• In stage 2 hypertensive patients, the losartan 50 mg/amlodipine 5 mg combination reduced systolic blood pressure by 36.5 mmHg at 6 weeks, significantly more than amlodipine 5 mg monotherapy (31.6 mmHg; p=0.0117) 7
• The combination was non-inferior to amlodipine 10 mg monotherapy in patients who failed amlodipine 5 mg alone, with comparable diastolic blood pressure reductions (8.9 vs 9.4 mmHg) 8
• Response rates (achieving BP <140/90 mmHg) with the combination reached 52.1% at 2 weeks versus 33.3% with monotherapy (p=0.0213) 7

Dosing Algorithm for Blood Pressure Control

Week 0-2:

• Start losartan 50 mg/amlodipine 5 mg once daily 1, 2
• Monitor blood pressure at 2 weeks 2, 4

Week 2-4:

• If BP remains ≥140/90 mmHg, titrate to losartan 100 mg/amlodipine 10 mg once daily 1, 2
• Continue monitoring every 2-4 weeks until target achieved 2, 4

Week 4-8:

• If BP still uncontrolled on maximum combination dose, add hydrochlorothiazide 12.5-25 mg daily as third agent 1, 7
• Target BP <130/80 mmHg should be achieved within 3 months 4

Individual Component Dosing Ranges

Losartan component:

• Usual dose range: 50-100 mg daily in 1 or 2 divided doses 1, 9
• Starting dose: 50 mg once daily 1, 10
• Target dose for hypertension: 100 mg daily 10, 9
• Maximum dose: 100 mg daily for hypertension (150 mg daily may be used in heart failure) 9, 3

Amlodipine component:

• Usual dose range: 2.5-10 mg once daily 1, 11
• Starting dose: 5 mg once daily 1
• Maximum dose: 10 mg once daily 1, 11

Critical Safety Monitoring

Within 1-2 weeks of initiation or dose changes:

• Check serum creatinine/eGFR and potassium levels, especially in patients with diabetes, chronic kidney disease, or those on potassium-sparing agents 9, 12
• Monitor for symptomatic hypotension or orthostatic changes, particularly in elderly patients 5, 2

Ongoing monitoring:

• Blood pressure assessment every 2-4 weeks until target achieved, then at least annually 4
• Annual monitoring of electrolytes and renal function during maintenance therapy 9

Important Contraindications and Warnings

Never combine losartan with:

• ACE inhibitors (increases risk of hyperkalemia, syncope, and acute kidney injury without added benefit) 1, 5, 9, 12
• Direct renin inhibitors like aliskiren (same risks as ACE inhibitor combination) 1, 9

Avoid in:

• Pregnancy (both losartan and amlodipine are contraindicated; serious fetal toxicity) 1, 9, 12
• Severe hepatic impairment (reduce losartan starting dose to 25 mg daily) 9
• Patients with history of angioedema with ARBs 1

Common Pitfalls to Avoid

• Underdosing: Less than 25% of patients are titrated to target doses in clinical practice; ensure uptitration to losartan 100 mg/amlodipine 10 mg if BP remains uncontrolled 9
• Premature addition of third agent: Allow 2-4 weeks at each dose level before escalating therapy 2, 7
• Ignoring adherence: Before escalating therapy, assess medication adherence as non-adherence is a common cause of apparent treatment failure 9
• Excessive caution in elderly: While monitoring is important, the combination is effective and generally well-tolerated in older adults when titrated appropriately 5, 2

Special Populations

Elderly patients:

• Start with standard dose but monitor carefully for hypotension and orthostatic changes 5, 2
• Titrate more gradually if history of hypotension or drug-associated side effects 5, 2

Chronic kidney disease:

• Losartan is recommended for CKD with eGFR >30 mL/min/1.73 m² 9
• Monitor electrolytes and renal function closely within 1-2 weeks of initiation 9, 12

Diabetic patients:

• This combination is appropriate; losartan provides renal protection in diabetic nephropathy 9, 12
• Target losartan dose of 100 mg daily for optimal renal outcomes 9, 12