
Periactin can also be used to treat allergy symptoms. The symptoms it is known for treating in regards to inhalant allergies such as ragweed and pollen are watery, itchy eyes, hives and rashes.

Periactin is an antihistamine given to help relieve cold - and allergy-related symptoms such as hay fever, nasal inflammation, stuffy nose, red and inflamed eyes, hives, and swelling. Periactin may also be given after epinephrine to help treat anaphylaxis, a life-threatening allergic reaction.

At times, patients have allergic reactions to blood or plasma transfusions they receive. A doctor may put the patient on periactin because it improves a patient's reaction to this type of allergy.

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