It's a disease-modifying anti-rheumatic drug (DMARD). It reduces inflammation and so reduces pain and swelling.
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It’s used to treat rheumatoid arthritis and lupus.
It’s usually given as 200–400 mg tablets daily to begin with. When your condition is very well controlled this may drop to 2–3 times per week.
Side-effects are uncommon, but some people may experience, skin rashes, indigestion, diarrhoea, headaches and blurred vision.