Plaquenil is used to treat or prevent malaria, a disease caused by parasites that enter the body through the bite of a mosquito. Malaria is common in areas such as Africa, South America, and Southern Asia. Plaquenil sun allergy Plaquenil who takes it Taking hydroxychloroquine and sulfasalazine together side effects A loading dose of 1,200 mg daily, given for 6 weeks may decrease the time to clinical response. However, experts debate that this higher dosage may increase the risk of toxicity. Hydroxychloroquine can be taken in a single or divided dose to control gastrointestinal side effects. The usual starting dose of Plaquenil is 200 mg twice a day or 400 mg once a day, administered orally, in people weighing 80 kg or more. The usual dosage works for most people who take Plaquenil, but it is possible to increase or decrease the dose based on individual needs. Plaquenil is also an antirheumatic medicine and is used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus. Important information Taking Plaquenil long-term or at high doses may cause irreversible damage to the retina of your eye. Plaquenil is also an antirheumatic medicine and is used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus. This medicine is not effective against all strains of malaria. Dosage of plaquenil for rheumatoid arthritis Wrong Hydroxychloroquine Dose Is Common, Putting Eyes at Risk., Taking Plaquenil for Rheumatoid Arthritis Hydroxychloroquine prevalenceHydroxychloroquine methotrexate drug interactionsPlaquenil nervous systemHow to dissolve chloroquine Aug 14, 2017 Plaquenil can cause serious side effects when used in high doses for chronic diseases such as RA over the long term. The New Zealand Dermatological Society recommends that to decrease the risk of retina damage, no more than 200mg of Plaquenil should be taken a day, and a dose of 400mg per day should be taken no longer than a few weeks. Long-Term Side Effects of Plaquenil for Rheumatoid Arthritis.. Plaquenil Uses, Dosage & Side Effects -. Side Effects of Plaquenil Hydroxychloroquine, Warnings, Uses. Given at a low dose, methotrexate is effective in controlling the swelling, pain, and stiffness that result from inflammation. In a significant percentage of patients, it also seems to slow the progression of rheumatoid arthritis and prevent damage to joints and related structures. 2,3. This medication comes in both pill and injectable forms. Plaquenil hydroxychloroquine has been shown to improve physical function in up to 80% of patients with rheumatoid arthritis. Plaquenil hydroxychloroquine is commonly used for lupus in children because of less side effects compared to other medications. Plaquenil hydroxychloroquine is an effective medication for autoimmune conditions and malaria that comes with less side effects than other DMARDs. Upsides. Plaquenil hydroxychloroquine has been shown to improve physical function in up to 80% of patients with rheumatoid arthritis.