> Western Medicines > Flunitrazepam


Used for: Insomnia
Chinese name:

What is Flunitrazepam for?

Flunitrazepam is an intermediate to long-acting benzodiazepine hypnotic working by binding to GABA receptors to depress the central nervous system, hence used for insomnia.

How to use it?

Flunitrazepam is taken as oral tablets just before bedtime with or without food for short-term to prevent the development of dependence.


Severe insomnia
0.5-2 mg daily at bedtime.


0.5-1 mg daily at bedtime.

What are the side effects of Flunitrazepam?

Common side effects of Flunitrazepam include, but not limited to, cardiac failure, abnormal dreams, amnesia, psychosis, sweating, skin rash and muscle pain.

Who should not take Flunitrazepam?

  • People who are allergic to Flunitrazepam or any component of the formulation or other benzodiazepines.
  • Patients with severe hepatic impairment.
  • Patients with myasthenia gravis.
  • Patients with severe respiratory insufficiency and sleep apnea.

Pharmacist Tips:

  • Ensure good sleep hygiene to aid sleep like keeping your nightly routine consistent and unplug from electronics.
  • Benzodiazepines like Flunitrazepam cannot be used long-term to prevent the development of dependence.
  • Do not drive or operate machinery after taking Flunitrazepam.

Common dosing schedule:
Flunitrazepam is to be taken once at bedtime to aid sleep.


This schedule is for reference only, adjustments may be made according to individual needs.


Some common medications Flunitrazepam may interact with:

Flunitrazepam may interact with many other medications. Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Flunitrazepam in Hong Kong?

In Hong Kong, Flunitrazepam is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. 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 https://www.drugoffice.gov.hk

Need more information?

For detailed information about the use of Flunitrazepam 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.

Brands in Hong Kong
Available dosage
  • 1mg / 2mg (Tablets)
Drug class
Sub class
Alternative Names
Other drugs in same class
Used for: Anxiety
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Used for: Insomnia
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