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 drug study Plaquenil and diabetic retinopathy What does hydroxychloroquine do to the body How long do i have to take plaquenil Check with your doctor immediately if any of the following side effects occur while taking hydroxychloroquine Incidence not known Blistering, peeling, loosening of the skin 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. Before taking hydroxychloroquine, tell your doctor and pharmacist if you are allergic to hydroxychloroquine, chloroquine Aralen, primaquine, or any other drugs. tell your doctor and pharmacist what prescription and nonprescription drugs you are taking, especially acetaminophen Tylenol, others, digoxin Lanoxin. 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. Plaquenil medication side effects Plaquenil oral Reviews and User Ratings Effectiveness, Ease of Use., Hydroxychloroquine Uses, Dosage & Side Effects - Lupus like illness normal blood work plaquenil effectiveChloroquine hydrochloride tabletsChloroquine phosphate ip 250 mgWhat kind of medicine is mefloquine chloroquine primaquine and quinine Tell your doctor if any of the following side effects, as they may be indications of a more serious reaction Headache. Loss of appetite. Dizziness. Nausea. Diarrhea, vomiting, or stomach pain. Skin rash. Plaquenil Hydroxychloroquine - Side Effects, Dosage.. Hydroxychloroquine MedlinePlus Drug Information. Plaquenil Oral Uses, Side Effects, Interactions.. SIDE EFFECTS Nausea, stomach cramps, loss of appetite, diarrhea, dizziness, or headache may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. 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, Hydroxychloroquine Plaquenil is used to treat malaria, lupus, and rheumatoid arthritis. Learn about side effects, warnings, dosage, and more.