Varies, with meds!: Good morning, how long you should wait after alcohol depends on the type of antihistamine. For non-sedating antihistamines such as Claritin and allegra, it there should be no additive sedative effect with the combination, while Benadryl (diphenhydramine) and hydroxyzine, you need to be fearful of the added sedation due to alcohol intake and wait at least four hours for the alcohol level to come down.
Answered 6/24/2014
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How much alcohol?: Depends how much alcohol is consumed, 6-8 hrs is safe for 1 drink.
Answered 3/21/2013
5.2k views
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