> Western Medicines > Stemetil


What is Stemetil for?

Stemetil belongs to a class of medications called typical antipsychotics. It works by balancing the chemicals in the brain, and hence restores normal neurological behavior. Stemetil is therefore used to relieve nausea and vomiting, anxiety, vertigo due to ear diseases, and is used to treat psychotic disorders such as schizophrenia.

How to use it?

Stemetil is taken orally, and the dosages are listed below.


Vertigo in patients with Meniere’s syndrome or labyrinthitis
5 mg three times daily, which may be increased gradually to 30 mg daily in divided doses. After several weeks, reduce the dose to 5-10 mg daily.

Dose reduction may be necessary.


Nausea and vomiting
For prevention of nausea and vomiting, use 5-10 mg 2-3 times daily.
For treatment of nausea and vomiting, use 20 mg initially, followed by 10 mg after 2 hours if necessary.

Dose reduction may be necessary.

Child over 1 year
Body weight >10 kg: 0.25 mg/kg body weight 2-3 times daily.


Short term management of severe anxiety
As adjunct therapy. Initially 15-20 mg daily in divided doses. May increase to a maximum of 40 mg daily if necessary.

Dose reduction may be necessary.


Mania, Schizophrenia
Initially 12.5 mg twice daily for 7 days, then gradually increase in 4-7 days interval until satisfactory response is achieved. Usual dose is 75-100 mg daily.

Dose reduction may be necessary.

What are the side effects of Stemetil?

Common side effects of Stemetil include palpitation, irregular heartbeat, constipation, dizziness, drowsiness, dry mouth, insomnia, seizure, tremor and vomiting.

Who should not take Stemetil?

  • People who are allergic to Prochlorperazine, phenothiazines or any component of the formulation
  • Children under 2 years of age or weighing under 9 kg (20 lbs)
  • Patient in coma or presence of large amounts of CNS depressants (e.g. alcohol, opioids, barbiturates)

Pharmacist Tips:

  • Avoid alcohol and antacids use while taking this medication.
  • Do not stop taking this medication suddenly even if you feel well.
  • This medication may cause drowsiness. Avoid driving or operating machinery until you know how you respond to Stemetil.
  • Stemetil can cause your skin to be more sensitive to sunlight. You should avoid exposure to direct sunlight or heat while taking this medicine.
  • Rise slowly from a sitting or lying position as this medication can cause postural hypotension.
  • Report to your doctor immediately if you experience extrapyramidal symptoms, such as involuntary or uncontrollable movements, restlessness, muscle spasms and tremors.
  • This medication may cause false readings on some types of pregnancy tests.

Common dosing schedule:
Stemetil can be taken with or without food. Taking it with food may help to reduce gastrointestinal discomfort.


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


Some common medications Stemetil may interact with:

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Stemetil in Hong Kong?

In Hong Kong, Stemetil 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 Stemetil 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.

Available dosage
  • 5mg (Tablets)
Drug class
Antiemetics, Antipsychotics
Sub class
Typical Antipsychotics
Generic Names
Other drugs in same class
Used for: Behavioral problems in children, Intractable hiccups, Bipolar disorder, Nausea and vomiting, Schizophrenia
Chinese name:
Used for: Depression
Chinese name: