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. Sjogren's syndrome and plaquenil Success with plaquenil Can plaquenil cause inflammation in my respiratory system Coronary heart disease is found among people who take Plaquenil, especially for people who are female, 60+ old, have been taking the drug for 1 - 6 months, also take medication Vioxx, and have Osteoporosis Cardiac Effects, including Cardiomyopathy and QT prolongation Postmarketing cases of life-threatening and fatal cardiomyopathy have been reported with use of Plaquenil as well as with use of chloroquine. Patients may present with atrioventricular block, pulmonary hypertension, sick sinus syndrome or with cardiac complications. Cardiac disorders Cardiomyopathy which may result in cardiac failure and in some cases a fatal outcome see WARNINGS and OVERDOSAGE. PLAQUENIL prolongs the QT interval. Ventricular arrhythmias and torsade de pointes have been reported in patients taking PLAQUENIL see OVERDOSAGE and DRUG INTERACTIONS. 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 cardiac Hydroxychloroquine Side Effects, Dosage, Uses, and More, Plaquenil - FDA prescribing information, side effects and uses Life extension chloroquineOrder aralen malariaPlaquenil and dental workHydroxychloroquine sulfate drug interactions Hydroxychloroquine Plaquenil is a drug that is classified as an anti-malarial drug. Plaquenil is prescribed for the treatment or prevention of malaria. It is also prescribed for the treatment of rheumatoid arthritis, lupus, and the side effects of lupus such as hair loss, joint pain, and more. Hydroxychloroquine Plaquenil Side Effects & Dosage for.. Side Effects of Plaquenil Hydroxychloroquine, Warnings, Uses. Maternal Use of Hydroxychloroquine is Associated with a.. Chloroquine CQ and hydroxychloroquine Plaquenil HCQ have been used for many years, initially for the treatment of malaria but now more commonly for the treatment of inflammatory diseases such as rheumatoid arthritis and lupus 1. It is now considered for new disease applications in diabetes, heart disease and adjunct cancer therapies 2. The American Heart Association is qualified 501c3 tax-exempt organization. *Red Dress ™ DHHS, Go Red ™; AHA; National Wear Red Day ® is registered trademark. Find information about common, infrequent and rare side effects of Plaquenil Oral.