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A member asked:
How long does half of one 37.5 mg phentermine tablet stay in your system which would show up on a drug test.
2 doctors weighed in across 2 answers
Upto 4 days: In general Phentermine could last in your system between 1 and 4 days
Answered 9/5/2017
2.2k views
Half life is 20h: The drug's half life is 20 hours, meaning that after 20 hours, half of the dose has been eliminated. 20 hours after that, 3/4 of the dose has been eliminated and 20 hours after that 7/8 of the drug has been eliminated. At 80 hours virtually all of the drug has been eliminated. Depending on sensitivity of urine test you should allow 60-80 hours for elimination. Thanks for trusting HealthTap!
Answered 7/30/2018
2.2k views
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