Does losartan “get old” (expire)?
Yes. Like other medicines, losartan tablets have an expiration date, after which the drug may lose strength and could be less effective. You should not use losartan past its labeled expiration date.
How to tell if losartan has gone bad
Even before the expiration date, don’t take losartan if you notice things like:
- The tablets look different from normal (color change, crumbling, or unusual spots)
- The container was damaged or opened and stored improperly
- There’s evidence of moisture exposure (for tightly controlled packaging)
If you’re unsure, check with your pharmacist.
How long does losartan last after opening (or after pharmacy dispensing)?
For most oral tablets, the safe rule is to rely on the expiration date on the bottle, because the “time after opening” is not usually treated as a separate guaranteed window for strength. If you need a more specific answer for your exact product, ask a pharmacist and share the brand/manufacturer and how it was stored.
What does “gets old” mean—does it stop working over time?
Lozartan doesn’t “age” in a way that makes it gradually stop working on a predictable schedule. The key issue is chemical stability and whether the product is still within its expiration dating. Taking an expired drug can reduce effectiveness, which matters for blood pressure and kidney/heart protection.
When should you replace it?
Replace losartan when:
- The expiration date has passed, or
- The pills look/feel unusual or the bottle wasn’t stored correctly (heat, moisture, or leaving it in a hot car)
If you’re changing to a new bottle, keep taking it as prescribed and talk to your clinician if you’ve missed doses or your blood pressure has been unstable.
If you tell me the form (tablet vs. something else), the strength (e.g., 25/50/100 mg), and whether you mean “expired” or “stored a long time,” I can tailor the answer.