First Aid FAQ's

Can antihistamines prevent anaphylaxis?

No. Antihistamines can block histamine that causes allergies, but they work too slowly to prevent the onset of anaphylaxis. Moreover, taking too many antihistamines can lead to severe side effects, including tachycardia (rapid heart rate) and hypotension (low blood pressure). (The only exception may be in people with a history of exercise-induced anaphylaxis, although the preventive benefit may be minimal.

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