Based on NIH | Is it safe to have sex while taking losartan every day, and does daily use increase the risk of sexual side effects such as erectile dysfunction, low libido, or fertility issues?

Sex is generally safe while taking losartan daily, and most people do not experience sexual side effects from this medication. Losartan is an angiotensin II receptor blocker (ARB) used to treat high blood pressure and certain heart or kidney conditions, and it does not typically interfere with normal sexual activity. In fact, by helping control blood pressure, it can support overall cardiovascular health, which is important for sexual performance and safety.

Key Takeaways

• Sexual activity is typically safe on losartan for most users when blood pressure is well controlled.
• Erectile dysfunction (ED) and low libido are not common with losartan; if they occur, they are usually mild and may be related to underlying hypertension or other causes rather than the drug itself.
• Fertility concerns are minimal at human doses, and there is no strong evidence that losartan impairs male fertility in humans; however, losartan must be avoided during pregnancy due to serious fetal risks. ^[1]

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Sexual Side Effects: What’s Known

Erectile Dysfunction and Libido

• Large clinical safety data for losartan show it is well tolerated, with common side effects being headache and dizziness; sexual adverse effects are uncommon. ^[2]
• Impotence (erectile dysfunction) has been reported, but it is infrequent and not a defining side effect of ARBs like losartan. ^{[3] [4]}
• Compared with some other blood pressure medications (for example, certain beta‑blockers or thiazide diuretics), ARBs are generally considered neutral or even potentially beneficial for sexual function. ^[5]
• In a clinical trial in men with diabetes and ED, losartan improved erectile function, and combining losartan with tadalafil was more effective than either alone. ^[6]

Fertility

• Animal studies indicate no impairment of male fertility at high oral doses of losartan in rats. ^{[7] [8] [9]}
• At toxic, very high doses in female rats, reduced reproductive indices were observed, but these doses are far above usual human exposure. ^{[7] [8] [9]}
• Human data do not show losartan as a cause of infertility in men or women at therapeutic doses, though routine caution is advised due to limited direct human fertility studies.

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Safety of Sexual Activity While on Losartan

Blood Pressure and Sexual Activity

• If your blood pressure is controlled and you feel well on losartan, sexual activity is generally safe and does not interact adversely with the medication itself.
• Dizziness can occur, especially when starting or increasing the dose; if you feel lightheaded, rise slowly, hydrate well, and consider timing sexual activity when you feel steady. ^[2]

Pregnancy Precautions

• Do not take losartan during pregnancy. Losartan can cause serious harm or death to a developing fetus, especially in the second and third trimesters; stop losartan and call your clinician immediately if you become pregnant. ^[1]
• People who could become pregnant should use reliable contraception while on losartan and discuss planning with their clinician. ^[1]

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What If You Notice Sexual Changes?

• If you experience new ED, reduced libido, or performance changes, consider that high blood pressure, diabetes, stress, depression, sleep issues, alcohol, smoking, and other medications are common contributors.
• Since losartan is rarely the main cause, address lifestyle and medical factors first (optimize blood pressure, glucose, weight, sleep, and exercise).
• If symptoms persist, speak with your clinician; adjusting medications (for example, reviewing diuretics or certain beta‑blockers), adding ED treatments like tadalafil or sildenafil, or evaluating hormonal or vascular causes may help. Evidence suggests losartan can be part of a regimen that improves ED, especially in diabetes. ^{[6] [5]}

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Practical Tips

• Stay consistent with your daily losartan to keep blood pressure controlled, which supports sexual health.
• Monitor for dizziness, especially when standing or during exertion; if present, discuss dose timing or adjustments with your clinician. ^[2]
• Avoid losartan if pregnant or planning pregnancy; choose alternative blood pressure treatments that are safe in pregnancy. ^[1]
• Report any persistent sexual side effects, as these can often be managed without stopping losartan.

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Bottom Line

Daily losartan use is generally safe with sexual activity, and the risk of sexual side effects like erectile dysfunction or low libido appears low compared with several other blood pressure medications. ^{[2] [5]} While impotence is listed among possible adverse events, it is uncommon, and some evidence suggests losartan may even improve erectile function in certain groups such as men with diabetes. ^{[3] [4] [6]} There is no strong human evidence that losartan impairs fertility at usual doses; however, it must be avoided during pregnancy due to serious fetal risks. ^[1]