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Dimenhydrinate is primarily used to prevent and treat symptoms of motion sickness and to relieve vertigo that may be associated with inner ear problems.

Last Modified: 20 May 2024

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What is Dimenhydrinate? 

Dimenhydrinate is an over-the-counter antihistamine used to prevent and treat nausea, vomiting, and dizziness caused by motion sickness and vertigo. It is partly composed of another antihistamine called diphenhydramine. 

Global Name

Generic name: Dimenhydrinate 
Brand names: Dramamine, Gravol, Dizinil 


What is Dimenhydrinate used for? 

Dimenhydrinate is primarily used to prevent and treat symptoms of motion sickness and to relieve vertigo that may be associated with inner ear problems. 

How do you use Dimenhydrinate ? 


Dimenhydrinate is available in tablet, chewable tablet, liquid, and suppository forms.

Dosage information: 

  • Adults: 50-100 mg every 4-6 hours, not to exceed 400 mg in 24 hours. 
  • Children: Dosage varies by age; refer to package instructions or consult a doctor. 

Side Effects

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

Pharmacist Tips

  • Storage: Store at room temperature away from moisture and heat. 
  • Timing: Take 30 minutes before traveling for motion sickness prevention. 
  • Hydration: Stay well-hydrated to help minimize dizziness and dry mouth. 
  • Drowsiness: Be aware of how Dimenhydrinate affects you before engaging in activities requiring mental alertness. 


Where is Dimenhydrinate available in Hong Kong?

Dimenhydrinate is an over-the-counter (OTC) medication that can be sold without a prescription. It is found in all chain drug stores, including Mannings and Watsons.


Is Dimenhydrinate available over-the-counter? 

Yes, Dimenhydrinate is available OTC.

Can Dimenhydrinate be used for morning sickness?

Consult with a healthcare provider for use during pregnancy.

How long does the effect of Dimenhydrinate last?

Effects can last up to 4-6 hours; do not exceed recommended dosage. 

This website provides content related to drug use and medicine for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Do not use the information on this website to diagnose or treat a health problem or disease without consulting a qualified healthcare provider. The website's owners and contributors are not liable for any repercussions, adverse effects, or consequences resulting from the use of any medication or information provided herein.

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