Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria. Side effects of chloroquine Chloroquine phosphate marine Plaquenil costfor generic Plaquenil is generally well-tolerated, but side effects are possible. Common side effects linked to Plaquenil include nausea and diarrhea. Taking the medication with food eases nausea for most people taking the drug. Less common side effects include skin rashes, hair thinning, and weakness. Hydroxychloroquine plaquenil and sulfasalazine azulfidine are used for mild rheumatoid arthritis. they are not as powerful as other dmards, but they usually cause fewer side effects. 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. Hydroxychloroquine may also be used for purposes not listed in this medication guide. Hydroxychloroquine is also used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus. Side effects of hydroxychloroquine for ra Treatments for Rheumatoid Arthritis, What are the side effects of using hydroxychloroquine Plaquenil and. Is hydroxychloroquine an anti inflammatory Hydroxychloroquine Plaquenil and sulfasalazine Azulfidine are used for mild rheumatoid arthritis. They are not as powerful as other DMARDs, but they usually cause fewer side effects. In rare cases, Plaquenil can adversely affect the eyes, and people taking this medicine should be seen by an ophthalmologist at least once a year. What are the side effects of using hydroxychloroquine.. Hydroxychloroquine Plaquenil. RA and Hydroxychloroquine How Effective is it for.. What Are Side Effects of Plaquenil? nausea, vomiting, stomach pain or cramps, loss of appetite, weight loss, diarrhea, dizziness, spinning sensation, headache, ringing in your ears, 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. Hydroxychloroquine side effects. nausea. irritability. sensation of spinning. shaking or unsteadiness. unsteady walk. vomiting. diarrhea. nervousness. buzzing or ringing in the ears.