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. North pharmaceuticals makers of hydroxychloroquine Plaquenil heat Chloroquine antimalarial Chloroquine for ra Aug 29, 2014 Plaquenil, hydroxychloroquine HCQ, is an anti-malarial medication that has been proven to be useful in the treatment of patients with rheumatoid arthritis RA, systemic lupus erythematosus SLE and other inflammatory and autoimmune diseases. In Sjögren’s, Plaquenil is used to treat many symptoms. Plaquenil Hydroxychloroquine is used to treat and prevent malaria infection, and to reduce symptoms and progression of autoimmune diseases such as lupus & others. Hydroxychloroquine may cause a condition that affects the heart rhythm QT prolongation. 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. Hydroxychloroquine issues Long-Term Side Effects of Plaquenil for Rheumatoid Arthritis., Plaquenil Hydroxychloroquine - Side Effects, Dosage. Chloroquine cancer 2015Hydroxychloroquine for vasculities rash Hydroxychloroquine and diabetes drugs all decrease your blood sugar level. Taking hydroxychloroquine with these drugs could cause hypoglycemia low blood sugar. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Hydroxychloroquine Oral Uses, Side Effects, Interactions.. Hydroxychloroquine Uses, Dosage & Side Effects -. Hydroxychloroquine-related eye problems were once considered rare, but better detection methods now show that they occur in about 7 percent of patients. The risk increases with a higher dose and longer therapy. Vision risks. Hydroxychloroquine is dosed according to body weight. Many systemic medications may cause retinal toxicity. One such commonly used medication for dermatologic and rheumatologic inflammatory conditions is hydroxychloroquine Plaquenil, a chloroquine derivative. It is used to treat many diseases including malaria, rheumatoid arthritis and systemic lupus erythematosus. Hydroxychloroquine can cause serious liver or heart problems, especially if you use certain medicines at the same time, including other medicines to treat malaria; an antibiotic or antifungal medicine; antiviral medicine to treat hepatitis or HIV/AIDS; antidepressants or antipsychotic.