How much benadryl (diphenhydramine) can i take for an allergic reaction?

Allergic Reaction: The adult dose is: 25 to 50 mg every 4 to 8 hours.

50 mg: Is usually a goo dose. Often, 25 mg will do. Benadryl (diphenhydramine) can be taken every 4 - 6 hours. The most common side effect is drowsiness.

BENADRYL (diphenhydramine) DOSE:: Up to 50 mg each dose every 4 hours as needed. Maximum dose not more than 400 mg in a day. Adverse events: drowsiness, hypotension, increased heart rate, paradoxical excitement, dry mouth, thickened bronchial secretions, etc.