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. Hydroxychloroquine lymphadenopathy Hydroxychloroquine step 1 Sam's club pharmacy hydrochloride hydroxychloroquine If your doctor prescribes blood thinners, your blood will be periodically tested for the presence of cardiolipin and beta-2 glycoprotein 1 antibodies. If your test results show that the antibodies. 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. SIDE EFFECTS. The following adverse reactions have been identified during post-approval use of PLAQUENIL or other 4-aminoqunoline compounds. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. 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 blood thinner Hydroxychloroquine Is A Blood Thinner - MedsChat, Plaquenil Uses, Dosage & Side Effects - How to switch from plaquenil to methotrexate200 plaquenil day lupusPlaquenil side effects skin discolorationHow long does it take plaquenil to affect bones 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 Malaria. Side Effects of Plaquenil Hydroxychloroquine, Warnings, Uses. Plaquenil Is Thinning My Blood Lupus Forums at The Lupus Site. 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. Blood Disorders. According to the New Zealand Dermatological Society, Plaquenil can cause abnormalities in blood counts. An abnormally low number of white blood cells can lead to infection, because white blood cells defend the body against bacteria. Low platelet count thrombocytopenia can lead to easy bleeding and bruising. What is antiphospholipid syndrome? Antiphospholipid syndrome APS is a systemic autoimmune disease characterized by production of antibodies – antiphospholipid antibodies aPL – that “attack” the person’s own body, resulting in blood clots and/or pregnancy complications. Antiphospholipid-antibody-positive patients also may develop other clinical problems.