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. What is in chloroquine Chloroquine phosphate syrup Plaquenil and omeprazole Side effects include irritability, headache, weakness, hair lightening or loss, stomach upset, nausea, dizziness, muscle pain, rash and itching. Rarely, hydroxychloroquine can affect the bone marrow leading to reduced white blood cells leukopenia or platelets thrombocytopenia and abnormal red blood cells anemia. Plaquenil is the brand name for the prescription drug hydroxychloroquine. It's used to treat and prevent malaria infection, and to reduce symptoms and progression of autoimmune diseases such as lupus, rheumatoid arthritis, and others. These medications may interact and cause very harmful effects. Consult your healthcare professional e.g. doctor or pharmacist for more in formation. HYDROXYCHLOROQUINE/POSSIBLE QT PROLONGING AGENTS 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. Side effects of hydroxychloroquine medication Hydroxychloroquine Side Effects Common, Severe, Long Term -, Plaquenil Hydroxychloroquine - Side Effects, Dosage. Plaquenil and adrenal insufficiencyCan a 13 year old take hydroxychloroquine 200 mg tabletPlaquenil and discoid lupus dosageChloroquine and doxycycline similar drugsNonbiological dmard antimalarial hydroxychloroquine plaquenil Feb 19, 2020 Hydroxychloroquine may also be used for purposes not listed in this medication guide. What are the possible side effects of hydroxychloroquine Plaquenil, Plaquenil Sulfate, Quineprox? Get emergency medical help if you have signs of an allergic reaction hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Plaquenil Hydroxychloroquine Side effects, Images, Uses.. Hydroxychloroquine Oral Interactions with Other Medication. Hydroxychloroquine Side Effects -. The more common side effects that can occur with hydroxychloroquine include headache. dizziness. diarrhea. stomach cramps. vomiting. Aug 14, 2017 Long-Term Side Effects of Plaquenil for Rheumatoid Arthritis. Plaquenil is the brand name of hydroxychloroquine, a drug used to prevent or treat malaria. Plaquenil is also used for long-term treatment of autoimmune diseases such as rheumatoid arthritis RA and systemic lupus erythmatosis. Common side effects may include headache, dizziness, ringing in your ears; nausea, vomiting, stomach pain; loss of appetite, weight loss; mood changes, feeling nervous or irritable; skin rash or itching; or. hair loss.