Promethazine is an FDA-approved antihistamine medicine that is used to relieve symptoms of allergies. This blocks the effects of the chemical histamine in your body that causes allergy. This prescription comes as a 25 mg tablet for oral use.
What condition does Promethazine treat?
Promethazine is used to:
Allergic reactions occur when your immune system reacts to a foreign substance. Your immune system creates substances identified as antibodies. When you have allergies, your immune system creates antibodies that detect a specific allergen as harmful although it is not.
How does Promethazine work?
For allergies, Promethazine blocks histamine from binding to its receptors in various parts of the body. Histamine is a substance produced by the body as part of its defense mechanisms. This medication stops it causing the symptoms of an allergic reaction.
For vertigo, this drug blocks histamine receptors in a part of the brain known as the vomiting center. This portion of the brain is stimulated when it gets nerve messages to form a part of the inner called the vestibular apparatus. It’s accountable for making you feel sick and for the vomiting reaction. Promethazine stops the vomiting center from being stimulated.
For insomnia, this is known as a sedating antihistamine because it enters the brain in significant quantities and makes you feel sleepy. You can use this drug for a short period. It is to help you get to sleep if you are having trouble sleeping.
What is the dosage of Promethazine?
Promethazine is to be taken by mouth. The tablet is to be swallowed as a whole with a full glass of water. Do not break, chew, or crush the drug.
While having this medication, it is important to drink plenty of fluids. It may help lessen the risk of having certain side effects. The recommended dosage is based on your medical condition, age, and response to the treatment. Your doctor may start you on a lower dose and in due course increase the dose.
You should not take more or less than it is given. Even if you feel well, continue to take the medication until the full prescription is done. Do not suddenly stop taking Promethazine without the consent of your doctor.
What are the precautions of Promethazine?
Cost of Promethazine vs. Phenergan
The generic name Promethazine is a prescription that only costs $0.22 per unit and $13 for 60 tabs. The brand name Phenergan costs $0.63 per unit and $37.88 for 60 tabs. Therefore, Promethazine is a lot cheaper than Phenergan.