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How long does 25 mg Diphenhydramine Hydrochloride last in your system. I work shifts and find it difficult falling asleep at odd hours. I am also required to submit to random drug tests?
Wiki User
∙ 12y ago
I took a drug test in the hospital and they didn't even find it when i took 1000mg of diphenhydramine hydrochloride the night before.
Wiki User
∙ 12y ago
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