Although not all of these side effects may occur, if they do occur they may need medical attention. Check with your doctor immediately if any of the following side effects occur while taking hydroxychloroquine: Incidence not known Some side effects of hydroxychloroquine may occur that usually do not need medical attention. Plaquenil and zithromax for lyme Plaquenil insomnia Hydroxychloroquine sulfate is a colorless crystalline solid, soluble in water to at least 20 percent; chemically the drug is 2-4-7-Chloro-4-quinolylaminopentylethylamino ethanol sulfate 11. PLAQUENIL hydroxychloroquine sulfate tablets contain 200 mg hydroxychloroquine sulfate, equivalent to 155 mg base, and are for oral administration. Plaquenil is the brand name for the prescription drug hydroxychloroquine. It's used to treat and prevent malaria infection, and to reduce symptoms and progression of autoimmune diseases such as. Plaquenil is the brand name of hydroxychloroquine, a drug used to prevent or treat malaria 2. Plaquenil is also used for long-term treatment of autoimmune diseases such as rheumatoid arthritis RA and systemic lupus erythmatosis. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. These side effects may go away during treatment as your body adjusts to the medicine. Plaquenil for diarrhea Plaquenil aka HCQS – Anyone on this getting severe., Plaquenil Hydroxychloroquine - Side Effects, Dosage. Glioblastoma chloroquineSle lupus and plaquenilFatcs on chloroquineRemission with plaquenil Plaquenil hydroxychloroquine belongs to a group of medicines called quinolines. Plaquenil is used to treat or prevent malaria, a disease caused by parasites that enter the body through the bite of a mosquito. Malaria is common in areas such as Africa, South America, and Southern Asia. Plaquenil Uses, Dosage & Side Effects -. Long-Term Side Effects of Plaquenil for Rheumatoid Arthritis.. Plaquenil Use in Autoimmune Diseases. I've been on Plaquenil for almost 2 wks now and I'm also taking Prednisone, could one of these be causing my extreme stomach cramps? 2 nights ago, I had a cheeseburger and mac and cheese and I thought I was going to die about 1 in the morning. I ended up throwing up once and then I had diarrhea for a bit and then it passed once my system cleared. My doctor recently added Plaquenil to my medication list. He told me that my blood is clotting and Plaquenil is a blood thinner. He knew I had to do stressful depositions this past week, so to start the Plaquenil after because it's been known to cause stomach pains and diarrhea. Plaquenil is also used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus. Plaquenil is available in generic form. What Are Side Effects of Plaquenil? Common side effects of Plaquenil include. nausea, vomiting, stomach pain or cramps, loss of appetite, weight loss, diarrhea, dizziness, spinning sensation.