Does Losartan Cause Dizziness?
Yes, dizziness is a common side effect of losartan, an angiotensin II receptor blocker used to treat high blood pressure. Clinical data shows it affects 2-4% of patients, often due to blood pressure lowering that reduces blood flow to the brain.[1][2]
Why Does Losartan Cause Dizziness?
Losartan relaxes blood vessels to lower pressure, which can temporarily drop perfusion to the brain or inner ear, triggering lightheadedness. This happens most in the first weeks of treatment, during dose increases, or if standing quickly (orthostatic hypotension).[1][3]
How Common Is Dizziness and Who Gets It Most?
- Frequency: Reported in up to 4% of users in trials, higher (10-15%) in elderly patients or those with dehydration.[2][4]
- Risk factors: Older age, low sodium diets, concurrent diuretics, heart failure, or alcohol use amplify it.[1][3]
What Should You Do If It Happens?
Lie down until it passes, rise slowly from sitting/lying, stay hydrated, and avoid driving. Symptoms often improve as the body adjusts; notify a doctor if persistent, severe, or with fainting.[1][3]
When Does Dizziness Usually Start or Stop?
Onset within hours of first dose or increases; peaks in 1-2 weeks. Most cases resolve in 1-4 weeks, but 1-2% discontinue due to it.[2][4]
Is Dizziness a Sign of Something Worse?
Usually benign, but can signal low blood pressure, electrolyte imbalance, or kidney issues. Seek care if with chest pain, confusion, irregular heartbeat, or swelling.[1][3]
Losartan vs. Other Blood Pressure Meds for Dizziness
Losartan has lower dizziness rates than ACE inhibitors (e.g., lisinopril at 8-12%) but similar to other ARBs like valsartan. Calcium channel blockers like amlodipine cause less orthostatic dizziness.[2][4]
Sources
[1]: FDA Losartan Label
[2]: Drugs.com Losartan Side Effects
[3]: Mayo Clinic Losartan
[4]: WebMD Losartan