I've been taking plaquenil everyday since I was diagnosed a couple years ago. Unfortunately, I continued to have regular flare-ups in my hands, wrists, ankles and feet until my doctor decided to change my medication to quinacrine. I've been taking it with the plaquenil for about two months now and my flare-ups are getting better. Apparently, the quinacrine works better for me (it can have a strange side effect of turning your skin yellow, but luckily that didn't happen to me). My doctor is slowly tapering me off the plaquenil now just to make sure my system doesn't get jarred. I also take an anti-inflammatory everyday called mobic.
I know different medications work differently for different people, but that's my situation.