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. Does chloroquine interact with vitamins Plaquenil 200 mg tablet Effects of hydroxychloroquine? Hydroxychloroquine is a relatively well tolerated medicine. The most common adverse reactions. reported are stomach pain, nausea, vomiting, and headache. These side effects can often be lessened by taking hydroxychloroquine with food. Hydroxychloroquine may also cause itching in some people. Drugs That Prolong QT Interval And Other Arrhythmogenic Drugs. PLAQUENIL prolongs the QT interval and should not be administered with other drugs that have the potential to induce cardiac arrhythmias. Also, there may be an increased risk of inducing ventricular arrhythmias if PLAQUENIL is used concomitantly with other arrhythmogenic drugs. 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. 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. What are the warning on the nnedicine named hydroxychloroquine Plaquenil, Plaquenil Sulfate, Quineprox., Plaquenil Hydroxychloroquine Uses, Dosage, Side Effects. What are the ingredients in hydroxychloroquineHydroxychloroquine win side effects Hydroxychloroquine has been shown to cause severe hypoglycaemia including loss of consciousness that could be life threatening in patients treated with and without antidiabetic medications. Plaquenil-Hydroxychloroquine sulfate 200mg Film-coated.. Plaquenil Hydroxychloroquine - Side Effects, Dosage.. Hydroxychloroquine Uses, Dosage & Side Effects -. Plaquenil ® hydroxychloroquine – New Warnings • On January 27, 2017, the FDA approved new updates to the. Warnings. section of the Plaquenil hydroxychloroquine drug label regarding cardiac effects, including cardiomyopathy and QT prolongation, and hypoglycemia. • Plaquenil is indicated for the treatment of uncomplicated malaria due to Side effects include irritability, headache, weakness, hair lightening or loss, stomach upset, nausea, dizziness, muscle pain, rash and itching. Rarely, hydroxychloroquine can affect the bone marrow leading to reduced white blood cells leukopenia or platelets thrombocytopenia. Sep 13, 2019 Some side effects of hydroxychloroquine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.