QUESTION & ANSWER
Q: How long does clonazepam last?

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A:

Clonazepam’s effects last about 8 to 12 hours, so the clonazepam dosage for healthy adults is 2 to 3 times a day. It works quickly, usually within an hour, and reaches peak levels by about four hours. The clonazepam half-life is long at 30 to 40 hours. This means it can take several days to rid the body of it.

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  1. Clonazepam. U.S. National Library of Medicine. https://medlineplus.gov/druginfo/meds/a682279.html 
  2. Clonazepam Prescribing Information. Drugs.com. https://www.drugs.com/pro/clonazepam.html#s-34090-1