How long after taking a new medication would an allergic reaction occur?
How long after taking a new medication would an allergic reaction occur? Signs and symptoms of a serious drug allergy often occur within an hour after taking a drug. Other reactions, particularly rashes, can occur hours, days or weeks later. Drug allergy signs and symptoms may include: Skin rash. What are the 4 signs of a severe allergic reaction? Main allergy symptomssneezing and an itchy, runny or blocked nose (allergic rhinitis)itchy, red, watering eyes (conjunctivitis)wheezing, chest tightness, shortness of breath and a cough.a raised, itchy, red rash (hives)swollen lips, tongue, eyes or face.tummy pain, feeling sick, vomiting or diarrhoea. How...