Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria. What is a potential adverse effect of hydroxychloroquine plaquenil Plaquenil and arthritis 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". Also, generic plaquenil hydroxychloroquine is often associated with more GI side effets than the name brand. Arthritis Center Founded in 1998, the Arthritis Center at Johns Hopkins is dedicated to providing quality education to patients and healthcare providers alike. Hydroxychloroquine is generally prescribed at a daily dose of 6.5 milligrams or less per kilogram of body weight. Using this formula, the dosage for a 150-pound person would be 443 mg/day, as one kilogram equals 2.2 pounds. Because HCQ is formulated as a 200 mg tablet, many people taking it for lupus will take two pills per day. 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 Plaquenil Oral Uses, Side Effects, Interactions., Stomach problems with Plaquenil • Johns Hopkins Arthritis. Chloroquine injection dosage for adultsCost of plaquenil at costco 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 uncontrolled twisting movements of the neck, trunk, arms, or legs unusual behavior unusual bleeding or bruising Hydroxychloroquine Oral Route Side Effects - Mayo Clinic. Drug spotlight on hydroxychloroquine Lupus Foundation of.. Hydroxychloroquine - Side Effects, Dosage, Interactions.. Applies to hydroxychloroquine oral tablet. Along with its needed effects, hydroxychloroquine may cause some unwanted effects. 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 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. Hydroxychloroquine is usually taken with food or milk to prevent stomach upset. The dosage and length of treatment are based on your medical condition and response to therapy. In children, dosage.