Lisinopril and losartan lower blood pressure and protect kidneys about equally; the meaningful difference is that lisinopril causes a dry cough in 5 to 20% of users and losartan almost never does.
Lisinopril is an ACE inhibitor, losartan an ARB: they hit the same renin-angiotensin system one step apart, which is why efficacy matches but tolerability splits. The cough comes from bradykinin, and the standard fix is switching classes, not suffering through. Rare but serious with ACE inhibitors: angioedema, sudden swelling of the lips, tongue, or throat, which warrants emergency care and a permanent class change. Shared rules: both can raise potassium (periodic blood tests are normal), both are unsafe in pregnancy and stop immediately if you conceive, and both are inexpensive generics. Losartan has one small bonus, a mild uric-acid-lowering effect that suits gout-prone patients. If a lisinopril cough is wearing you down, the losartan switch resolves it in most people while keeping identical cardiovascular protection; that is a one-visit conversation, not a treatment failure.
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Common questions
Lisinopril vs losartan: which is better?
These are the two most-prescribed first-line blood pressure drugs, and head-to-head they lower pressure and protect the heart and kidneys about equally. The real difference is tolerability, not power. Lisinopril is an ACE inhibitor; its signature side effect is a persistent dry cough, caused by bradykinin buildup, affecting roughly 5 to 20% of users, and, rarely, angioedema (rapid swelling of lips, tongue, or throat, which is an emergency). Losartan is an ARB, working one step downstream on the same hormone system, so it delivers nearly the same benefit while almost never causing the cough, which is exactly why it exists as a class. Standard practice: many clinicians start with an ACE inhibitor, and if the cough shows up, switch to an ARB, since ARBs cost a bit more but both are cheap generics. Other considerations: both raise potassium slightly, so periodic blood tests come with either; both are dangerous in pregnancy and must be stopped if you conceive; and losartan has a mild uric-acid-lowering bonus that can help gout-prone patients. If your lisinopril cough is disrupting sleep or conversations, do not just quit it; ask for the losartan switch, which fixes the cough in the large majority of cases while keeping the same protection.