A 37-year-old female asked:
how many benadryl (diphenhydramine) is recommended for an adult with an allergic reaction to an sulfameth/trimethoprim. itchy mouth, rash on upper body ?
1 doctor answer
Dr. John Chiu answered
57 years experience Allergy and Immunology
Sulfa rash: Although Benadryl (diphenhydramine) 25-50 mg up to 4 times daily can be taken to control the itching, the rash is unlikely to be controlled by an antihistamine. If the problem is intolerable, you should contact the doctor who prescribed the drug re this issue. The reaction can rarely be life-threatening when the mucous membrane at the eyes, mouth , genitalia become inflamed.
Answered on Nov 5, 2015
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