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 drinking alcohol Dmards plaquenil PLAQUENIL ® hydroxychloroquine sulfate is a white or practically white, crystalline powder, freely soluble in water; practically insoluble in alcohol, chloroform, and in ether. The chemical name for hydroxychloroquine sulfate is 2-4-7-Chloro-4-quinolylaminopentylethylamino ethanol sulfate 11. The molecular weight of hydroxychloroquine sulfate is 433.95, and molecular formula is C. 18. H. 26. ClN. 3. O. H. 2. SO. 4. PLAQUENIL hydroxychloroquine sulfate tablets contain 200 mg hydroxychloroquine sulfate, equivalent to 155 mg administration. Inactive Ingredients Dibasic calcium phosphate USP, hypromellose USP, magnesium stearate Plaquenil hydroxychloroquine is an antimalarial medication used to treat or prevent malaria, a disease caused by parasites, which enter the body through the bite of a mosquito. Plaquenil is also used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus. 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. Plaquenile alcohol Plaquenil hydroxychloroquine sulfate dose, indications., PLAQUENIL HYDROXYCHLOROQUINE SULFATE TABLETS, USP DESCRIPTION Hydroxychloroquine dosage by weight Does Plaquenil Interact with other Medications? Severe Interactions. These medications are not usually taken together. Consult your healthcare professional e.g. doctor or pharmacist for more in. Plaquenil Oral Interactions with Other Medication. Side Effects of Plaquenil Hydroxychloroquine, Warnings, Uses. Hydroxychloroquine - Side Effects, Dosage, Interactions.. Alcohol interaction is found among people who take Plaquenil, especially for people who are female, 40-49 old, also take medication Elavil, Note This document contains side effect information about hydroxychloroquine. Some of the dosage forms listed on this page may not apply to the brand name Plaquenil. For the Consumer. Applies to hydroxychloroquine oral tablet. Along with its needed effects, hydroxychloroquine the active ingredient contained in Plaquenil may cause some unwanted effects. 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.