Phenergan, which contains the active ingredient promethazine, is indeed an antihistamine. It is primarily used to treat allergy symptoms, motion sickness, and nausea. Additionally, it has sedative properties, making it effective for promoting sleep in some cases. However, it should be used under medical supervision due to potential side effects.
Histamine is produced by the body in response to allergens, and antihistamine drugs work by blocking the action of histamine in the body.
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