Do you mean Hydroxychloroquine? The common brand name in the US is Plaquenil.
Plaquenil is used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus, specifically to reduce inflammation. It is a very common first medication when Lupus and other anti-inflammatory diseases are suspected. (Yes, that includes Sjogren's.)
Two things to note with this medication -
1) It takes 2-3 months to build up in your system, so don't expect immediate results.
2) There is a rare side effect on the eyes, you need to have a baseline eye exam by an ophthalmologist (not an optometrist!) soon, and a follow up exam at least once a year as long as you take it.
Check our first post, Lupus 101 for a list of questions most people will want to ask the rheumy. GO ahead an write down your questions - make 2 copies of the list, hand one to the Dr so s/he can follow along as you read off your copy of the list. Take extra paper & a pencil so you can take notes, too!
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde