Return to top Phenergan is an antihistamine that relieves nasal stuffiness and inflammation and red, inflamed eyes caused by hay fever and other allergies. Phenergan is also used as a sedative and sleep aid for both children and adults, and is prescribed to prevent and control nausea and vomiting before and after surgery and to prevent and treat motion sickness. It is also used, with other medications, for pain after surgery. Antihistamines work by decreasing the effects of histamine, a chemical the body releases in response to certain irritants.
Histamine narrows air passages in the lungs and contributes to inflammation.
Antihistamines reduce itching and swelling and dry up secretions from the nose, eyes, and throat. Most important fact about this drug Return to top Phenergan may cause considerable drowsiness. You should not drive or operate dangerous machinery or participate in any hazardous activity that requires full mental alertness until you know how you react to Phenergan. Return to top Take Phenergan exactly as prescribed. If you are taking Phenergan on a regular schedule, take the forgotten dose as soon as you remember.