Fenistil gel is used to treat skin conditions associated with allergies. It is mainly used to relieve symptoms associated with various skin irritations such as itching, redness, and swelling, resulting from skin allergies such as insect bites and allergic reactions to foods or medications, rashes resulting from skin diseases such as eczema and psoriasis, sunburn, where it is used to relieve pain and itching resulting from excessive exposure to sunlight, and itching resulting from chickenpox or measles.
Fenistil gel works by inhibiting the effects of histamine, which is released when allergic reactions occur in the body, thus relieving the symptoms of itching, redness, and swelling. It is applied directly to the affected skin with gentle massage until it is absorbed. It is usually used several times daily as needed or as directed by a doctor.