I was put on plaquenil for RA. I had slight diarrhea and no other issues in the first two weeks. I was feeling happy since I've seen people talking about side effects and very scary. In around three weeks, one day when I was in shower, I noticed that a lot of my hair came down. I looked into mirror, both sides of my scalp look thinner. I stopped it ever since then, talked to Dr. I don't want to be bald. Ridiculously I didn't even feel a difference after taking it for three and a half weeks, Dr. said it takes three months to be effective, but I paid for so many of my hair. I don't have a lot of hair, you know, and my hair means a lot to me.