What should you know about hives from prozac?

Prozac is the brand name for fluoxetine. Raised, itchy welts after starting it, changing the dose, or taking a dose may be related to the medicine, but timing cannot confirm the cause. Infection, foods, supplements, heat, and skin products can produce similar findings. Record when the medicine was taken, when the welts began, whether they moved or faded, and any other symptoms. The pages on [Hives](/conditions/urticaria/) and [Itchy Skin](/symptoms/itchy-skin/) explain the skin pattern.

Contact the prescribing clinician or an urgent medical service for instructions about the next dose; do not make a sudden prescription change on your own unless emergency staff direct you. Keep the medicine packet and a current list of all medicines, supplements, and recent products. Photograph the rash when it is visible. A clinician may recommend an oral antihistamine for symptoms; general information is available under [Antihistamine Treatment](/treatments/medical-dermatology/oral-antihistamine-therapy/). Do not test the suspected trigger by taking an extra dose.

Seek emergency help immediately for difficulty breathing, wheezing, throat tightness, faintness, collapse, or swelling of the lips, tongue, face, or mouth. These signs can accompany a serious medication reaction. New facial or mouth swelling needs prompt assessment even when breathing is normal; see [Angioedema](/conditions/angioedema/) and [Skin Swelling](/symptoms/skin-swelling/). Arrange a medical review for a recurring rash, blistering, skin pain, fever, or sores affecting the mouth or eyes.

Could fluoxetine be contributing to this rash? What should I do about the next dose? Which alternative medicines are suitable? Should this reaction be recorded as an allergy, and what warning signs need an emergency plan?