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Hydroxychloroquine is a prescription medicine for autoimmune conditions such as rheumatoid arthritis and lupus, and some skin conditions.
What should I know about Hydroxychloroquine?
It takes several weeks to start working. Long-term users, and people at higher risk of eye problems, have regular eye checks.
What are the side effects?
Stomach ache, nausea, diarrhoea, headache, itchy rash, mood changes and early blurred vision can occur.
Who should check first?
Tell your doctor if you have liver, kidney, blood or heart problems, diabetes, psoriasis or an eye condition. Interactions include digoxin, epilepsy medicines, antacids, some antibiotics and antidepressants.
When should I get help?
Get urgent advice for persistent vision changes, blistering or peeling skin, dark urine, pale stools or yellow skin. Call your local emergency number (000 in Australia) for swelling of the throat or tongue, or trouble breathing.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency. Outside Australia, use your local emergency number.
Source: NHS: About hydroxychloroquine. General education does not replace individual medical advice. Updated November 2026.
Explore our health guides and medicine FAQs. Medicine availability and product instructions vary by country; follow the leaflet supplied with your medicine.