Promethazine is an antihistamine that relieves allergy symptoms and motion sickness. It is also used to treat nausea and vomiting, and for sedation. Promethazine works by blocking the effects of a natural substance in the body.

Promethazine FAQ


What is promethazine used for?

Promethazine is used to treat allergy symptoms, nausea, vomiting, and motion sickness.

How does promethazine work?

Promethazine works by blocking the effects of histamine, a natural substance in the body.

What are the side effects of promethazine?

Common side effects include drowsiness, dizziness, dry mouth, and blurred vision.

Is promethazine safe for children?

Promethazine should not be used in children younger than 2 years old due to the risk of fatal breathing problems.

Can I take promethazine while pregnant?

It is not recommended to use promethazine during pregnancy as it may harm the unborn baby.

How should I take promethazine?

Take promethazine exactly as directed by your doctor. Do not take it in larger or smaller amounts or for longer than recommended.

Is promethazine available over the counter?

Promethazine is not available over the counter. You will need a prescription from a doctor to obtain this medicine.

What should I avoid while taking promethazine?

Avoid drinking alcohol, and be careful if you drive or do anything that requires you to be awake and alert.

Can I take promethazine with other medications?

Tell your doctor about all other medicines you use, especially other drugs that make you sleepy or slow your breathing.

What happens if I miss a dose of promethazine?

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose.

How long does it take for promethazine to work?

You should experience relief from your symptoms within 20 minutes after taking promethazine by mouth.

Can promethazine be habit-forming?

Promethazine has a low potential for abuse, and it is not considered to be habit-forming.

What happens if I overdose on promethazine?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Is promethazine the same as Phenergan?

Yes, Phenergan is a brand name for the drug promethazine.

How should I store promethazine?

Store promethazine at room temperature away from moisture, heat, and light.

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Information provided by Maryam Abdullahi-Mahdi. Reviewed by Prof. Vijay Sangar