Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria. Chloroquine kinase Plaquenil pill doses Does hydroxychloroquine lower immune system 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. Do not take Plaquenil if you have ever had an allergic reaction to hydroxychloroquine, chloroquine, or related products or any of the ingredients listed under "Product Description". Hydroxychloroquine 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. 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 stomach ulcer Why would Hydroxychloroquine Plaquenil cause my stomach., Plaquenil hydroxychloroquine sulfate Drug / Medicine. 3-hydroxychloroquine The more common side effects that can occur with hydroxychloroquine include headache. dizziness. diarrhea. stomach cramps. vomiting. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Hydroxychloroquine - Side Effects, Dosage, Interactions.. Drug spotlight on hydroxychloroquine Lupus Foundation of.. SIDE EFFECTS. The following adverse reactions have been identified during post-approval use of PLAQUENIL or other 4-aminoqunoline compounds. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. The study is based on hydroxychloroquine sulfate the active ingredients of Plaquenil and Plaquenil the brand name. Other drugs that have the same active ingredients e.g. generic drugs are not considered. Synonyms of Gastric ulcer are also considered in the study. 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.