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How Long Do Allergic Drug Reactions Last. 17 years experience Allergy and Immunology Depends. Even with adequate treatment some allergic reactions may take two to four weeks to go away. Typically hives due to a medication will last for only a few days. It would also depend on whether it was an immediate allergic reaction or one that developed over time.
Your immune system may become sensitive to the antibiotic the first time you take it. Anaphylaxis is a sudden life-threatening whole-body reaction to a drug or other allergen. Even with adequate treatment some allergic reactions may take two to four weeks to go away. If it developed over time it will take longer to fade as you have a build up of that medication in your system and you will likely continue to suffer some kind of rash until the medication is completely out of your. 17 years experience Allergy and Immunology Depends. But some take hours days or weeks to.
Your immune system may become sensitive to the antibiotic the first time you take it.
Swelling angioedema usually lasts 24-72 hours when it reaches maximum. If its allergic reaction stay away from the irritating object and try some anti-histamine. 30 years experience Pediatric Allergy and Asthma. Symptoms of a drug allergy may start right after you take it. The reaction can start soon after you take the medicine or days or weeks after you stop. 49k views Answered 2 years ago.