It may be harmful: It may be harmful to take 200mg of diphenhydramine a night, since the recommended dose is 25-50mg a night. That means it is time to work with one's primary care doctor to see what the sleeping problem is all about. The doctor may refer one to a sleep doctor or other specialist as needed.
Answered 10/23/2017
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2 doctors weighed in across 2 answers
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