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. Plaquenil toxicity icd9 Cyp2d6 and plaquenil What are hydroxychloroquine Plaquenil and chloroquine Aralen? These medications are in a class of medications called Disease Modifying Anti-Rheumatic Drugs, or DMARDS. DMARDs are a slow acting but effective treatment for rheumatoid arthritis and other forms of inflammatory arthritis. Hydroxychloroquine is in a class of drugs called antimalarials. It is used to prevent and treat acute attacks of malaria. It is also used to treat discoid or systemic lupus erythematosus and rheumatoid arthritis in patients whose symptoms have not improved with other treatments. Urine hydroxychloroquine levels were still detectable after 3 months with approximately 10% of the dose excreted as the parent drug. Results following a single dose of a 200 mg tablet versus i.v. infusion 155 mg, demonstrated a half-life of about 40 days and a large volume of distribution. 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. Splitting hydroxychloroquine Cutting Pills in Half Could Pose Problems, Hydroxychloroquine MedlinePlus Drug Information Lichen planopilaris plaquenil Diagnosis Hydroxychloroquine-induced retinal toxicity Discussion. Chloroquine CQ and hydroxychloroquine Plaquenil HCQ have been used for many years, initially for the treatment of malaria but now more commonly for the treatment of inflammatory diseases such as rheumatoid arthritis and lupus 1. It is now considered for new disease applications in diabetes, heart disease and adjunct cancer therapies 2. Hydroxychloroquine Plaquenil Toxicity and.. PLAQUENIL HYDROXYCHLOROQUINE SULFATE TABLETS, USP DESCRIPTION. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Hydroxychloroquine HCQ is nearly identical in structure to CQ and has a similar mechanism of action and therapeutic efficacy in rheumatological and infectious diseases. Like CQ, it also has a long half-life, and a very high volume of distribution. For patients taking hydroxychloroquine to prevent malaria Your doctor may want you to start taking this medicine 1 to 2 weeks before you travel to an area where there is a chance of getting malaria. This will help you to see how you react to the medicine. Plaquenil hydroxychloroquine is a medication most known for its original purpose of treating or preventing malaria, a disease caused by parasites that enter the body through the bite of a mosquito.