How long is losartan potassium tablets imprinted with z 18 on the front good for how long will they last after prescription?

Losartan potassium tablets (often imprinted with codes like “Z 18”) are generally not limited by “how long the pill was made”—they’re limited by the expiration date on the bottle, based on how they were manufactured and stored.

How long are they good for after you get them?

• Best answer: Use the expiration date printed on the prescription bottle. That’s the validated shelf-life when stored properly (usually at controlled room temperature, away from heat/moisture).
• If the bottle is unopened: follow the expiration date.
• If you’re asking “how long after filling it can I still take them?”: typically patients are advised to not use them past the expiration date.

Can you take them if they’re past the expiration date?

Usually they may still be okay, but potency and safety aren’t guaranteed. Risks are mainly reduced effectiveness (and in rare cases, issues from moisture/contamination if storage was poor). If it’s past the date by a long time, it’s safer to ask your pharmacist.

Storage matters a lot

They usually should be kept:

• at room temperature
• in the original bottle
• away from moisture (bathroom/humid areas) and heat (car, near stove)

What I need from you to be more specific

If you tell me:

1. the expiration date on the bottle (month/year), and
2. whether it has been stored normally (room temp, original bottle),
   I can help you interpret whether it’s likely still within shelf life and what to do next.

If you want, you can also share the dose strength (e.g., 25 mg, 50 mg, 100 mg) from the label.