•Sudden swelling of your face or throat, hives (also known as nettle rash or urticaria), severe skin irritation, reddening, or blistering. These could indicate a severe allergic reaction.
•Blistering of the skin, mouth, eyes, and genitals.
•Convulsions (fits).
•Fever or flu-like symptoms, which may be an early sign of Stevens-Johnson syndrome, a severe skin reaction.