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. Synthesis of chloroquine from 4 7 dichloroquinoline Does plaquenil help with inflammation If the initiation of chemoprophylaxis is delayed ie, 2 weeks of therapy not completed prior to the exposure, the manufacturer recommends initiating therapy by doubling the initial dose 13 mg/kg of hydroxychloroquine sulfate and administering in 2 divided doses 6 hours apart; maximum single dose 400 mg/dose hydroxychloroquine sulfate. Hydroxychloroquine is used to treat or prevent malaria, a disease caused by parasites that enter the body through the bite of a mosquito. One PLAQUENIL tablet contains 200 mg of hydroxychloroquine sulfate, which is equivalent to 155 mg base. Take PLAQUENIL with a meal or a glass of milk. Malaria Prophylaxis. Adults. 400 mg 310 mg base once weekly on the same day of each week starting 2 weeks prior to exposure, and continued for 4 weeks after leaving the endemic area. 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. Hydroxy chloroquine 400 mg Hydroxychloroquine Oral Route Side Effects - Mayo Clinic, Hydroxychloroquine - Side Effects, Dosage, Interactions. Chloroquine dose in rheumatoid arthritisExtraerythrocytic malria and chloroquine Efficacy and Safety of Hydroxychloroquine for Treatment of Pneumonia Caused by 2019-nCoV HC-nCoV The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Efficacy and Safety of Hydroxychloroquine for Treatment of.. Plaquenil Hydroxychloroquine Uses, Dosage, Side Effects.. Hydroxychloroquine - Side Effects, Dosage, Interactions - Drugs.. One of the most serious side effects is retinopathy generally with chronic use. People taking 400 mg of hydroxychloroquine or less per day generally have a negligible risk of macular toxicity, whereas the risk begins to go up when a person takes the medication over 5 years or has a cumulative dose of more than 1000 grams. Find patient medical information for Hydroxychloroquine Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Then, 6.5 mg per kg of body weight taken 6 hours, 24 hours, and 48 hours after the first dose. However, dose is usually not more than 800 mg for the first dose and not more than 400 mg for the next doses. For treatment of arthritis Adults—At first, 400 to 600 milligrams mg taken as a single dose or in two divided doses once a day.