How long does amoxicillin allergic reaction rash last?

This is a harmless rash and does not mean that your child has an allergy to ampicillin, amoxicillin, or other penicillin drugs. An allergic reaction would cause hives or more severe symptoms than a rash. Often it is caused by a viral infection such as Roseola. The rash usually lasts 3 days, with a range of 1 to 6 days. read more

Non-allergic amoxicillin rash looks like a small widespread pink spots in a symmetrical pattern. Sometimes the rash is slightly raised and pink in color. The rashes appear after five to seven days of taking amoxicillin and commonly found on the chest, back, and abdomen. read more

More girls than boys develop a rash in reaction to taking amoxicillin. Children who have mononucleosis (more commonly known as mono) and then take antibiotics may be more likely to get the rash. In fact, the amoxicillin rash was first noticed in the 1960s in children who were being treated with ampicillin for mono, according to the Journal of Pediatrics. read more

Days. Usually a few days to week. Rarely over a month. read more