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. Mucinex and hydroxychloroquine Avn with hydroxychloroquine To make sure Plaquenil is safe for you, tell your doctor if you have a history of vision changes or damage to your retina caused by an anti-malaria medication; heart disease, heart rhythm disorder such as long QT syndrome; diabetes; a stomach disorder; an allergy to quinine; liver or kidney. A drug developed over half a century ago to treat malaria is showing signs that it may also help cure COVID-19 -- especially when combined with an antibiotic, a promising new study reveals. Hydroxychloroquine Plaquenil is used to treat malaria, lupus, and rheumatoid arthritis. Learn about side effects, warnings, dosage, and more. 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. Information on the medication plaquenil Plaquenil - FDA prescribing information, side effects and uses, Old malaria drug hydroxychloroquine may help cure. Plaquenil biologicWhat heart problems are associated with plaquenilChloroquine diphosphate in transfectionPlasmodium falciparum chloroquine resistance first seen Note This document contains side effect information about hydroxychloroquine. Some of the dosage forms listed on this page may not apply to the brand name Plaquenil. For the Consumer. Applies to hydroxychloroquine oral tablet. Along with its needed effects, hydroxychloroquine the active ingredient contained in Plaquenil may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Plaquenil Side Effects Common, Severe, Long Term -. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Hydroxychloroquine Plaquenil. PLAQUENIL is indicated for the treatment of uncomplicated malaria due to P. falciparum, P. malariae, P. ovale, and P. vivax. PLAQUENIL is indicated for the prophylaxis of malaria in geographic areas where chloroquine resistance is not reported. Limitations Of Use In Malaria. PLAQUENIL is not recommended for the treatment of complicated malaria. Plaquenil may be used for short or long-term rheumatoid arthritis treatment. In treating rheumatoid arthritis, Plaquenil may slow down the process of joint damage and relieve the symptoms of the. Plaquenil Dosage Malaria. Adults 400 mg 310 mg base once weekly on the same day of each week starting 2 weeks prior. Lupus Erythematosus. The recommended adult dosage is 200 to 400 mg 155 to 310 mg base daily. Rheumatoid Arthritis. The action of hydroxychloroquine is cumulative and may.