This eye toxicity limits long-term use of the drugs. The risk of toxicity is low for individuals without complicating conditions during the first 5 years of treatment using less than 6.5 mg/kg/day of hydroxychloroquine or 3 mg/kg/day of chloroquine, and/or cumulative doses of less than 1000 gram and 460 gram (total dose), respectively. Plaquenil testing review of optometry Do hydroxychloroquine get you high Chloroquine and hydroxychloroquine have the same indications and usage, although the dosage regimens are different. Head-to-head comparisons suggest similar responses with equivalent doses, but greater retinal toxicity with chloroquine 2. In dermatology, antimalarial drugs, such as chloroquine, are regarded as appropriate treatments for Chloroquine and hydroxychloroquine both belong to the quinolone family and share similar clinical indications and side effects, including retinal toxicity. Chloroquine-induced retinal toxicity was first described in 1959 and the retinal toxic effects of hydroxychloroquine were later described in 1967 3, 4. Disease Entity. Hydroxychloroquine Plaquenil and chloroquine cause ocular toxicity to various parts of the eye such as the cornea, ciliary body, and retina. Chloroquine can also induce cataract formation; however, no reports of hydroxychloroquine and cataract have been reported. The earliest signs of toxicity include bilateral paracentral visual field changes (best detected with a red test object) and a subtle granular depigmentation of the paracentral RPE. Some physicians suggest that lean body weight is more accurate when calculating daily dosage. Chloroquine toxicity dose Hydroxychloroquine DermNet NZ, Hydroxychloroquine Plaquenil Toxicity and Recommendations. 2016 ophthalmology journal hydroxychloroquinePlaquenil and methotrexate for sjogren's syndromePlaquenil and maculopathy Usual Adult Dose for Malaria Prophylaxis. 500 mg chloroquine phosphate 300 mg base orally on the same day each week Comments-If possible, suppressive therapy should start 2 weeks prior to exposure; if unable to start 2 weeks before exposure, an initial loading dose of 1 g chloroquine phosphate 600 mg base may be taken orally in 2 divided doses, 6 hours apart. Chloroquine Dosage Guide with Precautions -. Hydroxychloroquine toxicity - EyeWiki. Chloroquine and Hydroxychloroquine • LITFL • Toxicology.. Toxicity. Chloroquine toxicity is rare but has been known to occur when unusually high doses of chloroquine are ingested or after chronic IV administration. Accidental ingestion has also occurred in children. When toxicity is present, the most common symptom is retinal toxicity. Abstract. Background The American Academy of Ophthalmology recommendations on screening for chloroquine CQ and hydroxychloroquine HCQ retinopathy are revised in light of new information about the prevalence of toxicity, risk factors, fundus distribution, and effectiveness of screening tools. Retina Manifestations of Chloroquine and Hydroxychloroquine Toxicity. The classical definition of chloroquine toxicity is characterized by bilateral pigmentary change of the macula usually sparing the fovea. This has come to be known as bull’s-eye maculopathy. The retinal periphery may also be involved but infrequently.