A 40-year-old member asked:
how long after taking a medicine can an allergic reaction occur?
1 doctor answer
Dr. Gary Steven answered
29 years experience Pediatric Allergy and Asthma
Varies: If severely allergic, symptoms such as itching, hives, or wheezing can start immediately, or may develop 30 minutes to 4 hours after taking it. Milder reactions, such as rash, may not start for several days after starting he medication or, as is often the case with antibiotics, not until the second or third time you take it.
Answered on Aug 7, 2013
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