Our Symptom checker provides clinical advice on what to do next based on your symptoms.
Hives is a skin rash that is often triggered by an infection or allergy. Learn to recognise symptoms.
Penicillin is the name given to a widely-used group of antibiotic drugs. Penicillin can have side-effects, and some people suffer allergic reactions. Find out more here.
Cat and dog allergy
Allergies to cats and dogs are common, and symptoms can be severe. Learn more about how to live with a pet allergy.
Allergic reactions to antibiotics
Some people have an allergic reaction to antibiotics. Learn about the symptoms and the difference between allergic reactions and side effects.
Anaphylaxis is very serious and can even be fatal. See here for the symptoms to look out for and what to do in an emergency.
Allergies and hypersensitivities
An allergic reaction occurs when the immune system overreacts to a foreign substance that usually causes few or no problems in most people.
Itchy skin is a common irritation that can be very frustrating. Understand the different types of itchy skin and how to ease the discomfort.
Allergic reactions to cow's milk
About 1 in 50 infants has an allergic reaction to cow’s milk. Learn more here about allergy to milk proteins.
Antihistamine medications help ease allergy symptoms. Read more about how they're used to treat conditions like hay fever and asthma.
Cefalexin is used to treat bacterial infections in various parts of the body. This page explains how cefalexin works, its risks and other treatment options available in its place.