Assuming there is no personal contraindication (such as a previous adverse reaction to Benadryl) you probably could take it for allergies that involve your nose (allergic rhinitis). However, you would be well advised to take one of the more recent generation of antihistamines, most of which avoid the problem of drowsiness and a number of which are available over-the-counter. If you have any doubt about which to take, give your doctor or his nurse a call and ask which of these they would recommend.
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