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. Chloroquine toxicity dose Plaquenil and respiratory problems Find patient medical information for Hydroxychloroquine Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Taking hydroxychloroquine long-term or at high doses may cause irreversible damage to the retina of your eye. Stop taking hydroxychloroquine and call your doctor at once if you have trouble focusing, if you see light streaks or flashes in your vision, or if you notice any swelling or color changes in your eyes. 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. Hydroxychloroquine sul tabs 200 mg Hydroxychloroquine Oral Tablet 200Mg Drug Medication Dosage., Plaquenil, Plaquenil Sulfate, Quineprox hydroxychloroquine. Plaquenil and anxietyCan plaquenil make ra worse One tablet of hydroxychloroquine sulfate, USP 200 mg, is equivalent to 155 mg base. Lupus erythematosus Initially, the average adult dose is 400 mg =310 mg base once or twice daily. This may be continued for several weeks or months, depending on the response of the patient. Hydroxychloroquine Sulfate Tablets, USP 200 mg*. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Hydroxychloroquine - Welcome to Costco Wholesale. Hydroxychloroquine Oral tablet 200mg Drug Medication Dosage information. Learn about the reported side effects, related class drugs, and how these medications will affect your daily lifestyle. Visit for more details. Mylan manufactures HYDROXYCHLOROQUINE SULFATE Tablets, USP Plaquenil in strengths of 200 mg. Product Profile. Strength 200 mg. HYDROXYCHLOROQUINE SULFATE. Hydroxychloroquine is used to prevent or treat malaria infections caused by mosquito bites. It does not work against certain types of malaria chloroquine-resistant. The United States Center for.