> Western Medicines > Plaquenil


Chinese name:

What is Plaquenil?

Plaquenil is a brand product that contains Hydroxychloroquine, which belongs to a class of antimalarial agents. It works by killing the malaria parasite and is therefore used to treat or prevent malaria. It is also used to treat autoimmune conditions such as rheumatoid arthritis and lupus.

How to use it?

Plaquenil is available as tablets. Taking it with meal or milk can enhance absorption.

For prevention of malaria, take 400 mg one day a week. Begin treatment 2 weeks prior to exposure and continue until 8 weeks after exposure.


For rheumatoid arthritis and lupus erythematosus, take 200-400 mg once daily. The maximum daily dose is 400 mg per day.


What are the side effects of Plaquenil?

Common side effects of Plaquenil include nausea and vomiting, fatigue, headache, dizziness, decreased appetite and visual disturbances. Long-term use at higher doses can cause eye toxicity, so it is important to have eyes examined on a regular basis.

Who should not take Plaquenil?

  • People who are allergic to any ingredient of Plaquenil.

Pharmacist Tips:

  • Do not exceed the prescribed dose.
  • Take antacids 4 hours before or after taking Plaquenil.
  • Taking Plaquenil can cause sensitivity to light. Wear sunscreen or avoid sun exposure when taking this medicine.

Common dosing schedule: 
Take with or without food.


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


Some common medications Plaquenil may interact with:

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

Where to buy Plaquenil in Hong Kong?

In Hong Kong, Plaquenil 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 Plaquenil 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
  • 200mg (Tablets)
Drug class
Antimalarial Agents
Sub class
Generic Names
Other drugs in same class