One year
Govenor Granholm signed a new law effective 2/2010 that makes them good for 90 days after the date they were written.
There are dates on the prescription paper and on the prescription container that will tell a person how long their prescription can be used. This varies from weeks to a year.
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7 days ?
2 months
90 days
A written prescription for lab tests is typically valid for a specified period of time determined by the healthcare provider, which is usually around 6 months. It's important to check the expiration date on the prescription as some tests may require more immediate processing.
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"Good prescription drug" is increasingly being seen as an oxymoron...
Drugs aren't dangerous if taken after expiration date. A lot of prescription drugs have a really long shelf life even after the expiration date, but the effectiveness of the prescription will decrease as time goes by after the expiration date.
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Until the prescription runs out. If you've got a prescription for benzodiazepines that gives you 10 days' worth of pills, don't try using it six months after it runs out.