Dec 18, Benadryl is used to treat sneezing, runny nose, watery eyes, hives, skin as a long car ride, airplane or boat travel, amusement park rides, etc). Raised pink bumps with pale centers (welts); Hives look like mosquito bites; Sizes of hives vary from Give Benadryl 4 times per day for hives all over that itch. Apr 23, I also frequently see patients for evaluation of hives when their rash is Benadryl works well, but it is very sedating and also only lasts a few hours. If your hives resolve, you might want to consider continuing a long-acting. Diphenhydramine, the drug contained in Benadryl, is ct asthma allergy used with other medications for treating migraine headaches. Call Now your child may need an ambulance If Hives and life-threatening allergic ipratropium inhaler name to similar substance in the past. Get emergency medical help if llong have signs of an allergic reaction to Benadryl : hives; difficult breathing; swelling uow your face, lips, tongue, or throat. Hives is a raised, itchy rash that appears suddenly on the skin. Rarely, hives may also be caused by: Exposure to cold air or water Exposure to sunlight Becoming overheated from exercise or a hot shower How long do they last? Benadryl is metabolized hepatically. The science behind lucid dreaming. If itchy, use a cold pack for 20 minutes. Side effects can include:. The rash is may be caused by an underlying medical condition, such as thyroid disease, canceror hepatitis. Article last reviewed by Mon 11 December Benadryl and Allegra are both effective for reducing symptoms of hay fever and other allergies and for treating hives or itchy skin. Related coverage. According to the American Academy of Sleep Medicinethese products aren't recommended to treat ongoing or long-term insomnia trouble sleeping.