Sep 20, 2025 · Penicillin allergy is a reaction of the immune system to the antibiotic medicine penicillin. Penicillin is used to treat bacterial infections. Penicillin allergy may cause hives, rash …

Nov 9, 2024 · Overview A drug allergy is the reaction of the immune system to a medicine. Any medicine — over-the-counter, prescription or herbal — can trigger a drug allergy. However, a …

Aug 30, 2024 · Food intolerance and other reactions A food intolerance or a reaction to another substance you ate may cause the same symptoms as a food allergy does — such as nausea, …

Aug 24, 2024 · Allergic reactions vary from person to person. They can range from minor irritation to a life-threatening emergency called anaphylaxis. While most allergies can't be cured, …

Aug 11, 2025 · In some people, a mold allergy is linked to asthma. If mold allergy is linked to asthma, mold exposure can cause restricted breathing and other airway symptoms. If you …

Aug 8, 2025 · Alpha-gal syndrome causes mild to intense allergies to red meat, such as beef, pork or lamb. It also can cause reactions to other foods that come from mammals, such as dairy …

Oct 24, 2025 · Find out about the COVID-19 vaccines, the benefits of a COVID-19 vaccination, the possible side effects and how to prevent infection.

Dec 1, 2025 · For management of allergic reactions: Adults—25 milligrams (mg) 3 or 4 times a day. Children 6 years of age and older—50 to 100 mg per day given in divided doses. Children …

Jul 2, 2024 · Reactions range from mild symptoms — such as hives or a stuffy nose — to severe and even life-threatening. If you think you have shellfish allergy, talk to your health care …

Aug 11, 2025 · Egg allergy symptoms vary from person to person. They usually happen soon after eating an egg or a food made with egg. Egg allergy symptoms can include: Skin swelling …