What should you know about over-the-counter drugs for hives?

Hives are raised, itchy welts that can appear suddenly and fade from one place while appearing elsewhere. They may follow an infection, medicine, food, insect exposure, heat, pressure, or another trigger, and sometimes no trigger is found. A single welt usually changes over a short period, while the overall episode may continue longer.

A non-drowsy oral antihistamine is commonly used to reduce histamine-driven itching and swelling. Some products cause sleepiness, impaired driving, dry mouth, or other effects. Check the active ingredient and avoid doubling products that contain the same medicine.

Follow the package directions and ask a pharmacist about age, pregnancy, breastfeeding, kidney or liver disease, and interactions with sedatives. Cool compresses, loose clothing, and avoiding heat or a suspected trigger may reduce discomfort. Keep a record of new foods, medicines, infections, and exposures if episodes recur. Do not rely on an antihistamine to manage throat tightness, faintness, wheezing, or rapidly worsening swelling.

Call emergency services for trouble breathing, throat or tongue swelling, faintness, confusion, or rapidly worsening facial swelling. Seek medical advice for repeated episodes, hives with fever or joint pain, bruised-looking marks, or symptoms that do not settle. A clinician may need to review the trigger, diagnosis, and whether another treatment is appropriate.

Ask which antihistamine fits your medicines and health conditions, whether drowsiness could affect work or driving, what symptoms suggest angioedema, and how to handle a future episode. Ask whether persistent or recurring hives need allergy, medication, or other evaluation.