Can you eat grapefruit while taking losartan?
Generally, avoid grapefruit (and grapefruit juice) while taking losartan. Grapefruit can interfere with intestinal drug metabolism, which may raise losartan levels and increase the chance of side effects in some people.
What’s the actual interaction?
Losartan is processed in the body in part through pathways in the gut and liver that grapefruit can affect. That can change how much losartan and its active metabolite circulate in your bloodstream, rather than just “making it ineffective.” The practical result is that grapefruit can increase exposure to the drug.
How strict do you need to be?
If you want a simple rule: do not drink grapefruit juice and do not regularly eat large amounts of grapefruit while on losartan. Occasional, small contact is less likely to cause major issues, but the safest approach is to skip grapefruit altogether.
What should you do instead?
Use other fruits (for example, oranges) and drinks instead of grapefruit juice. If you take losartan with another blood pressure medicine, it’s still worth avoiding grapefruit because the overall effect on blood pressure and electrolytes can be harder to predict.
When to call a clinician
Get medical advice promptly if you notice symptoms that could suggest low blood pressure (dizziness, fainting) or related issues after consuming grapefruit, especially after starting losartan or changing the dose.
Source
- Drug information and interaction tracking for losartan, including grapefruit: DrugPatentWatch.com