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benadryl diphenhydramine take

A member asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience in Allergy and Immunology
About an hour: It will take about an hour to take effect.

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A 47-year-old female asked:
Dr. Nayla Mumneh
28 years experience in Allergy and Immunology
Hives: Depending on the extent of your hives, you may wish to seek medical help. You can go to a walk in clinic or emergency room. I doubt your hives are fro ... Read More
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A 24-year-old male asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience in Allergy and Immunology
Depends: Benadryl (diphenhydramine) may help hives but not a rash which has lasted more than 24 hrs. IM Benadryl (diphenhydramine) gives you perhaps a 30-minu ... Read More
A 41-year-old male asked:
Dr. Michael Finkelstein
36 years experience in Internal Medicine
Sure: As long as you know what the side effects are and can tolerate it
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A 59-year-old female asked:
Dr. Linda Schwartz
15 years experience in Pharmacology
Melatonin &Benadryl: You can take both melatonin and benadryl (diphenhydramine) together. They have different mechanisms of actions. However, they will have a synergistic ... Read More
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A 54-year-old female asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience in Allergy and Immunology
Benadryl (diphenhydramine): mind you, you're already on other medications as mentioned in your profile, valium (diazepam) can interact with diphenhydramine (benadryl) and cause ... Read More
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A 45-year-old member asked:
Dr. Thomas Seck
16 years experience in Pediatrics
Technically, 300mg : I don't recommend taking more than 100mg (25mg every 6 hours) without physician input, as that can be extremely sedating. That said, technically the ... Read More
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A 63-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience in Allergy and Immunology
Depends: Benadryl (diphenhydramine) is usually taken at 4-hour intervals. There is no age adjustment dose on adults but note that it may cause drowsiness & ... Read More
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A 34-year-old female asked:
Dr. Robert Greer
43 years experience in Family Medicine
Yes: All antihistamines can lose effectiveness. Most are over the counter now and i'd recommend switching to another family like allegra, claritin, (lorata ... Read More
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A 52-year-old member asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience in Allergy and Immunology
For most , 50 mg 4x: Up to 50 mg 4 times daily can be tolerated by most people but beware of significant drowsiness at least in the first 10 days.

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