> Western Medicines > Mirtazapine


Used for: Major depression, Tension-type headache, Panic disorder
Chinese name:

What is Mirtazapine for?

Mirtazapine is a tetracyclic antidepressant. It works by balancing different chemicals in your brain to improve your mood. Mirtazapine is therefore used to treat depression, generalized anxiety disorder and tension-type headaches.

How to use it?

Mirtazapine can be taken by mouth as conventional tablets or orodispersible tablets. You should start with 15-30 mg daily at bedtime for 2-4 weeks. The dose will then be adjusted according to your response. The maximum daily dose is 45 mg at bedtime. If you are taking orodispersible tablets, you should dissolve the tablets on your tongue and suck gently.

What are the side effects of Mirtazapine?

Common side effects of Mirtazapine include increased appetite, dizziness, drowsiness, dry mouth, sedation, and increased weight. Sedation seems to be more common at lower doses (15 mg per day).

Who should not take Mirtazapine?

  • People who are allergic to Mirtazapine or any ingredient of the formulation
  • People who are taking or took monoamine oxidase inhibitors (including Linezolid) within the past 14 days

Pharmacist Tips:

  • It takes about 4 to 6 weeks for Mirtazapine to work.
  • Do not stop Mirtazapine abruptly if you have been taking it for a long time (>3 weeks). Discuss with your doctor or pharmacist for advice on how to stop the medicine.
  • Do not break, chew or crush the orodispersible tablet. Allow it to dissolve in your mouth.
  • Antidepressants put children and young adults at risk for suicidal thoughts and behaviors. Caregiver should pay close attention.

Common dosing schedule:
Mirtazapine can be taken with or without food.


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


Some common medications Mirtazapine may interact with:

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

Where to buy Mirtazapine in Hong Kong?

In Hong Kong, Mirtazapine 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 Mirtazapine 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
Mirtazapine Sandoz
Remirta OD
Available dosage
  • 15mg / 30mg (Orodispersible Tablets)
  • 15mg / 30mg (Tablets)
Drug class
Sub class
Serotonin and norepinephrine reuptake inhibitors (SNRIs)
Other drugs in same class