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. When does plaquenil start working Chloroquine quinine in a fish dt If common side effects do occur, they are usually minor and last only for a short period of time. Please note the rare side effects listed below, specifically retinopathy, which causes damage to the eyes. Side effects associated with Plaquenil are placed in three categories common, less common, and rare. Some side effects 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. Check with your health care professional if any of the following. What are the side effects of Plaquenil? The most common side effects are diarrhea, nausea, vomiting, headache, dizziness, skin rash or black spots when you look at things. Most side effects will go away when your body gets used to the medicine. Tell your doctor if you have these side effects. A lower dose may stop them. Do not lower the dose on. 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. How long do plaquenil side effects last Common and Rare Side Effects for Plaquenil Oral, Hydroxychloroquine Oral Route Side Effects - Mayo Clinic Plaquenil use for sjogrens syndrome Our Plaquenil hydroxychloroquine Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. Side Effects of Plaquenil Hydroxychloroquine, Warnings, Uses. Lupus Medicines Hydroxychloroquine - Brigham and Women's.. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Find patient medical information for Plaquenil Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. May 07, 2012 Saturday was a week since I stopped taking Plaquenil, aka Hydroxychloroquine, per my doctor's instructions, and I think I am going through some form of withdrawal. I took the drug as a treatment for sarcoidosis and one of the side effects is a reduction in white blood cells, which is what has happened to me. Aug 29, 2014 This means that the side effects of Plaquenil are mild and infrequent compared with its potential benefits. As with any medication, allergic reactions including skin rashes and non-allergic reactions can occur. The side effect that is of greatest concern is retinal toxicity.