allergic to antibiotics symptoms
Your immune system may become sensitive to the antibiotic the first time you take it. You may have an allergic reaction the next time. The antibiotics most likely to cause an allergic reaction are penicillins and cephalosporins. Mild symptoms include red, itchy, flaky, or swollen skin. You may have a flat, red area on your skin that is covered with small bumps.
Antibiotic allergic reactions. Around 1 in 15 people have an allergic reaction to antibiotics, especially penicillin and cephalosporins. In most cases, the allergic reaction is mild to moderate and can take the form of: a raised, itchy skin rash (urticaria, or hives)