Medicines & Supplements A to Z > Dimenhydrinate


Last updated on July 3, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Dimenhydrinate


COMMON BRANDS IN HONG KONG: Novomin, Garcol, Gravol, Dramamine, Setmenate

What is Dimenhydrinate for?

Dimenhydrinate is a sedating (first generation) antihistamine that can be used to treat nausea and vomiting caused by motion sickness.

How to use it?

Dimenhydrinate can be taken by mouth as tablets and syrup or inserted into the rectum as suppositories. The adult dose is 50-100 mg 3-4 times daily and the maximum daily dose is 400 mg. If you are taking it for prevention of motion sickness, you should take it at least 30 minutes before your trip. The dose for children between 2 and 5 years old is 12.5-25 mg every 6-8 hours and the maximum daily dose is 75 mg; whereas that for children between 6 and 12 years old is 25-50 mg every 6-8 hours and the maximum daily dose is 150 mg. For suppositories, you should remove the wrapper, and insert suppository into the rectum.

What are the side effects of Dimenhydrinate? 

Common side effects of Dimenhydrinate include drowsiness and dizziness, dry mouth, blurred vision, and constipation. Avoid driving or operating machinery until you know how you respond to Dimenhydrinate. 

Where to buy Dimenhydrinate in Hong Kong?

In Hong Kong, Dimenhydrinate is an over-the-counter medicine and can be purchased without a prescription in a pharmacy by speaking with the pharmacist. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

For detailed information about the use of Dimenhydrinate in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.