> Western Medicines > Diazepam


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What is Diazepam for?

Diazepam (Valium) belongs to a group of medications called benzodiazepines, which have various uses. Diazepam is often prescribed to treat and prevent seizures, to manage anxiety, and to treat alcohol withdrawal. Your doctor may have also prescribed Diazepam for one of the following reasons:

  • Muscle spasms
  • Insomnia associated with anxiety
  • Panic attacks
  • Anxiety and agitation
  • Premedication prior to medical and dental procedures to relieve anxiety and provide light anesthesia

How to use it?

Diazepam (e.g. Valium) is most often taken by mouth as a tablet. It can also be given as an injection or given rectally.


For muscle spasms

2–15 mg daily in divided doses, then increase if necessary (in spastic conditions) to 60 mg daily; Adjust the dose according to response.


For muscle spasm in cerebral spasticity or in postoperative skeletal muscle spasm

Child 1–11 months
Initially 250 micrograms/kg twice daily.


Child 1–4 years
Initially 2.5 mg twice daily.


Child 5–11 years
Initially 5 mg twice daily.


Child 12–17 years
Initially 10 mg twice daily; maximum 40 mg per day.


For anxiety

2 mg 3 times a day, then increase if necessary to 15–30 mg daily in divided doses.


1 mg 3 times a day, then increase if necessary to 7.5–15 mg daily in divided doses.


For insomnia associated with anxiety

5–15 mg daily at bedtime.


For acute anxiety and agitation

500 micrograms/kg, then 500 micrograms/kg after 12 hours as required.


250 micrograms/kg, then 250 micrograms/kg after 12 hours as required.


For premedication / conscious sedation for procedures

5–10 mg 1–2 hours before procedure; For debilitated patients, use elderly dose.


2.5–5 mg 1–2 hours before procedure.


Intravenous injection
100–200 micrograms/kg immediately before procedure, to be administered into a large vein at a maximum rate of 5 mg/minute.


For sedation in dental procedures carried out in hospital

Up to 20 mg 1–2 hours before procedure.

What are the side effects of Diazepam?

Common side effects of Diazepam include decreased alertness, dizziness and drowsiness, nausea, and sleep disorders. Gait and coordination problems (ataxia) and confusion are more commonly seen in the elderly; whereas respiratory depression may occur with high doses of Diazepam, when combined with opioid medications, and when used intravenously.

Who should not take Diazepam?

  • Severe respiratory insufficiency, especially if you are using opioids, since there will be an increased risk of death due to respiratory depression caused by diazepam.
  • Anyone with a history of substance abuse since there is a risk of abuse with benzodiazepines.

Pharmacist Tips:

Patients should avoid abrupt discontinuation of the drug to prevent withdrawal symptoms.

Where to buy Diazepam in Hong Kong?

In Hong Kong, Diazepam 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 Diazepam 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
  • 5mg/ml (Injections)
  • 5mg/2.5ml / 10mg/2.5ml (Rectal Solution)
  • 1mg / 2mg / 5mg / 10mg (Tablets)
Drug class
Hypnotics, Anxiolytics
Sub class
Other drugs in same class
Used for: Anxiety
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Used for: Sedation, Anxiety, Panic disorder
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Used for: Insomnia
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Used for: Anxiety
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Used for: Seizures, Panic disorder, Anxiety disorder
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