Promethazine is the generic form of the brand-name drug Phenergan, used as an antihistamine, sedative, and anti-nausea drug. Your doctor may also prescribe promethazine to relieve allergy symptoms. PHENERGAN™ (promethazine hydrochloride) Suppositories, USP. DESCRIPTION. Each rectal suppository contains 12.5 mg or 25 mg promethazine HCl with ascorbyl palmitate, colloidal silicon dioxide, white wax, hard fat, and glyceryl monostearate. I still can not take this orally after 7 years due to the fact that I can not take the oral version of this without throwing it back up. I would not take more then 100 mg per time and not more then 4 times as day. If you are thaking this to sleep you may want to talk to your Dr. about Xanax. Xanax works on me both to quite me down as well as relax my muscles. By contrast, phenergan 25 mg to buy doxycyline is considered a semi-synthetic antibiotic i get very tired but i have only taken up to 75mg i would not recommend it as it can make you sick to the stomach if you take too much along with worse things Adults: 25 mg every 4 to 6 hours to a maximum daily dose of 100 mg. PROMETHAZINE is an antihistamine. Online check op schade verleden. Elke auto is. Each rectal suppository of Phenergan contains 12.5 mg, 25 mg, or 50 mg promethazine HCl with ascorbyl palmitate, silicon dioxide, white wax, and cocoa butter. Phenergan Suppositories are for rectal administration only. Can I take 2 Phenergan 25mg tablets (taking for sleeping) along with 1 Diclofenac Sodium 50mg Gastro-resistant - Answered by a verified Health Professional How to use Phenergan Tablet. Read the Patient Information Leaflet if available from your pharmacist before you start taking promethazine and each time you get a refill. Patient information for PHENERGAN 25MG TABLETS Including dosage instructions and possible side effects. You should not take Phenergan Tablets if you are breast-feeding. This is because small amounts may pass into mothers’ milk. This can be harmful to your baby. This is because small amounts may pass into mothers’ milk. The standard recommended dosage of Phenergan for treating allergies is 25 mg before bedtime. If necessary, smaller, more frequent doses can be given.