Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria. Plaquenil autoimmune thyroiditis Sigma chemical chloroquine phosphate Hydroxychloroquine is a quinoline medicine 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. This medicine is not effective against all strains of malaria. Plaquenil or hydroxychloroquine has been known to cause a darkened discoloration of skin and/or mucous membranes. This is considered an adverse reaction and should be discussed with your prescriber. It is important to evaluate this color change to make sure there is nothing else wrong. Hydroxychloroquine typically is very well tolerated. Serious side effects are rare. The most common side effects are nausea and diarrhea, which often improve with time. Less common side effects include rash, changes in skin pigment such as darkening or dark spots, hair changes, and muscle weakness. Taking hydroxychloroquine long-term or at high doses may cause irreversible damage to the retina of your eye. Hydroxychloroquine is also an antirheumatic medicine and is used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus. Hydroxychloroquine skin ACD A-Z of Skin - Hydroxychloroquine, Skin Discoloration and Plaquenil • Johns Hopkins Arthritis. Sjögren's syndrome hydroxychloroquineChloroquine and fluoroquinolone resistance dissertationHow long does it take for plaquenil to kick inChloroquine and prostate cancerHydroxychloroquine interference with warfarin Red skin lesions, often with a purple center severe mood or mental changes sore throat sores, ulcers, or white spots on the lips or in the mouth sticking out of the tongue stomach pain swelling of the feet or lower legs swollen or painful glands trouble with breathing, speaking, or swallowing Hydroxychloroquine Oral Route Side Effects - Mayo Clinic. Hydroxychloroquine Plaquenil. Hydroxychloroquine Side Effects Common, Severe, Long Term.. 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. 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. Hydroxychloroquine is commonly used alongside other disease-modifying drugs including methotrexate – especially for rheumatoid arthritis. However, some drugs can interact with hydroxychloroquine. Indigestion remedies for example, antacids including some over-the-counter preparations can stop hydroxychloroquine being absorbed.