A 40-year-old member asked:
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how long after taking a medicine can an allergic reaction occur?

1 doctor answer
Dr. Gary Steven
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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Related questions:

A 46-year-old member asked:
Dr. Arnold Beresh
40 years experience Podiatry
See below: Most reactions start from the 1st to 4th dose of a medicine.
A female asked:
Dr. John Goldman
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Rapidly leaves: 1/2 life depends on dose 3-10 hours with low dose and 8-15 hours with high dose We usually say it is out after 5 1/2 lives bt there are tissue ... Read More
A 50-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
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See allergist: If Luvena is the only drug that helps. consult an allergist to see if desensitization may be feasible.
A 33-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
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Something else: It is highly unlikely that your drug reaction would last over 30 days. The most common cause for itching is dry skin. Try avoiding scented soap and ap ... Read More
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