Medicines & Supplements A to Z > Venlafaxine


Last updated on 18/03/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Venlafaxine


BRAND NAME(S) IN HONG KONG: Deprevix, Efexor 怡諾思, Effexine, Trevilor, Valosine, Venexor

DRUG CLASS: Antidepressant; Serotonin / Norepinephrine Reuptake Inhibitor (SNRI)

USED FOR: Major depressive disorder, panic disorder, anxiety

OTHER DRUGS IN THE SAME CLASS: Desvenlafaxine, Duloxetine, Milnacipran

AVAILABLE DOSAGE FORMS: 37.5mg, 75mg, 150mg (prolonged-release capsules)

What is Venlafaxine for?

Venlafaxine belongs to a class of medications called Serotonin / Norepinephrine Reuptake Inhibitor (SNRI). It treats depression by increasing the amount of certain neurotransmitters that correlate with better mood and feelings of satisfaction and calmness. It is also used to relieve anxiety and panic disorder.

How to use it?

Venlafaxine can be taken orally. The usual starting dosage is 37.5-75 mg once daily, then increase gradually up to 225 mg once daily.

What are the side effects of Venlafaxine?

Common side effects include dizziness, drowsiness, dry mouth, constipation, weight loss and sleep disturbance. In some cases, patients have higher blood pressure.

Who should not take Venlafaxine?

Anyone who has an allergy to Venlafaxine or any other components of the formulation.

Pharmacist Tips:

– It might take a few weeks for Venlafaxine to reach its full effect.
– Do not stop taking Venlafaxine suddenly as you may suffer from withdrawal symptoms, such as nausea and dizziness.
– If you have signs of higher blood pressure (e.g. very bad headache, change in eyesight), please find your doctor.

Common dosing schedule:
– Venlafaxine can be taken with or without food.
– Do not drink alcohol as it may worsen your mood or anxiety.
– This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications that Venlafaxine may interact with:
– Monoamine oxidase inhibitors, e.g. Selegiline, Rasagiline
– Nonsteroidal anti-inflammatory drugs, e.g. Diclofenac, Ibuprofen)

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

Where to buy Venlafaxine in Hong Kong?

In Hong Kong, Venlafaxine 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

Need more information?

For detailed information about the use of Venlafaxine 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.