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I had a allergic reaction to penicillin, i took 3 tablets of amoxicillin and the next day; my fingers swelled up and i had a rash. So about 12 to 24 hours, however, even if the drug that caused the allergic reaction has left your body, the rash and other symptoms can still stay.

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11y ago
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12y ago

It can take seconds for a severe life-threatening reaction to medicines to happen, it Amy take a couple of days for less severe reactions to occur.

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14y ago

It should be noticable almost imediatley.

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Q: How long does it take for allergic reaction rash to appear from medication?
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