Most importantly, you help support continued development of this site. The majority of cases of retinotoxicity have occurred in patients that have had a cumulative dose exceeding 1000g of hydroxychloriquine (Plaquenil). This level is reached in about 7 years with the most common daily dose of Plaquenil, 400 mg/day (200 bid). Hydroxychloroquine and antacids Chloroquine purpose Chloroquine dose during pregnancy Ideal Body Weight for Calculating Hydroxychloroquine Dosage. The most important risk factor for hydroxychloroquine retinopathy is the daily dose of the drug. If a patient is overweight, one should use the ideal body weight to assess whether the doaily dose is in the toxic range /= 6.5 mg/kg/day. For prevention or treatment of malaria in infants and children, the amount of hydroxychloroquine is based on the child's weight. Your doctor will calculate this amount and tell you how much hydroxychloroquine your child should receive. For lupus erythematosus, one or two tablets are usually taken once or twice daily. 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. It now solely uses real body weight (rather than ideal body weight) based on new recommendations from a 2014 study (1). Disclaimer: This tool is designed to help eye care professionals better understand the risk the of retinotoxicity from hydroxychloroquine. Please note: This calculator was modified in 9/2015. Hydroxychloroquine dose by weight Hydroxychloroquine Blood Levels in SLE Clarifying dosing., Hydroxychloroquine MedlinePlus Drug Information Plaquenil maculopathy fluorescence angiographyPlaquenil eye examPlaquenil and early menopauseDrugs for rheumatoid arthritis starting with hydroxychloroquineAralen malaria prevention Nov 25, 2019 Initial dose 400 mg 310 mg base orally 1 to 2 times a day; this dose may be continued for several weeks or months, depending on patient response Maintenance dose 200 to 400 mg 155 to 310 mg base orally daily Comments-Each dose should be taken with a meal or a glass of milk. Hydroxychloroquine Dosage Guide with Precautions -. Hydroxychloroquine Plaquenil Side Effects & Dosage for Malaria. Plaquenil Risk Calculators. There is a small risk that hydroxychloroquine can damage your retina part of the eye, and this increases with long-term use and higher dosage. Your doctor will advise you on a safe dose to take according to your weight, and you will need to have regular monitoring of your eyes. At first, 13 mg per kg of body weight taken as a single dose. 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. The usual hydroxychloroquine dose that is prescribed is 400 mg/day. For this dosage, any woman with an ideal body weight less than 135 pounds would be in the toxic dose range. As one can see, the height that corresponds to an ideal body weight of 135 pounds varies across the formulas.