Not long: Trazodone has a biphasic half-life but both phases are short (3-6 & 5-9 hours). The rule of thumb is that your body is "cleaned out" after 5 half-lives, so 5x7 = 35 hrs. A day & a half after you've taken 1 dose of trazodone, only 3% will remain in your body.
Answered 12/21/2018
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