Antibiotics and Other Sulfonamides to Avoid If You Have a Sulfa Allergy Sulfa drugs are synthetic (man-made) medications made from sulfanilamide that contain antibacterial properties. Sulfa drugs were ...

Allergies are a type of hypersensitivity reaction caused by the immune system. There are many types of allergies. You can be ...

About four million people in the UK have the drug allergy on ... side-effects with an allergic reaction. Common allergic symptoms include itchy skin, a raised rash and swelling.