Lisinopril to Losartan Conversion Guidelines

Introduction to Conversion

• The equivalent dose of losartan for a patient taking 40 mg of lisinopril is 100 mg daily, as recommended by clinical guidelines 1, 2

Dose Equivalence Rationale

• According to clinical guidelines, when converting from an ACE inhibitor (lisinopril) to an ARB (losartan), specific dose equivalence must be considered for optimal therapeutic effect 1
• The American College of Cardiology guidelines indicate that the target dose of lisinopril is 20-40 mg daily, which corresponds to losartan 100 mg daily as the equivalent therapeutic dose 2

Conversion Process

• When switching from lisinopril to losartan, start with losartan 50 mg daily and titrate up to the target dose of 100 mg daily 2
• Titration should occur gradually, typically every 2 weeks, based on blood pressure response and tolerability 2
• Monitor for hypotension, changes in renal function, and hyperkalemia during the transition period 1

Clinical Considerations

• For patients with heart failure, clinical evidence supports that losartan 100 mg daily is the optimal dose for cardiovascular protection 2

Important Caveats

• Avoid simultaneous use of ACE inhibitors and ARBs as this combination increases the risk of hyperkalemia and renal dysfunction 2
• Both medications are contraindicated in pregnancy; women of childbearing age should use reliable contraception 3

Special Populations

• For pediatric patients, losartan dosing starts at 0.7 mg/kg per day (up to 50 mg) and can be increased to 1.4 mg/kg per day (up to 100 mg) 3