A member asked:

How long after taking guaifenesin ac for cough can i take benadryl (diphenhydramine). i know that the codeine and benadryl (diphenhydramine) can have additive effects on cns depression.

A doctor has provided 1 answer

No additive effect: between cough medication that you are going to take and Benadryl (diphenhydramine). I hope this helps. For more discussion make a virtual appointment at www.healthtap.com/dryetimyan

Answered 8/28/2015

2.4k views

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