Promethazine is a prescription first-generation antihistamine used to relieve symptoms of allergic conditions, including seasonal allergies, allergic conjunctivitis, and uncomplicated skin reactions such as hives. By blocking histamine receptors in the body, promethazine helps reduce itching, redness, watery eyes, runny nose, and other allergy-related discomforts.
In addition to its antihistamine effects, promethazine has sedative properties, which may also help improve rest during periods of severe allergy flare-ups. It is typically used for short-term symptom relief when other non-sedating antihistamines are not effective or appropriate.
Usage Instructions
• Take exactly as prescribed by your healthcare provider
• May be taken with food, water, or milk to reduce gastrointestinal discomfort
• Avoid alcohol while taking promethazine, as it can increase drowsiness
• Follow dosing instructions carefully, as higher doses may increase side effects without added benefit
Warnings & Precautions
• May cause significant drowsiness; use caution when driving or operating machinery
• Avoid alcohol and other sedating medications unless approved by your provider
• Use with caution if you have glaucoma, lung disease, seizure disorders, or liver problems
• Possible side effects include dry mouth, constipation, dizziness, and headache
• Inform your healthcare provider if you are pregnant, breastfeeding, or taking other antihistamines or sedatives