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. Chloroquine-proguanil malaria prophylaxis Hydroxychloroquine common than Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. RARE side effects A Change In Vision. Acquired Chromatopsia, A Change In Color Vision. Irritability. Loss Of Muscle Coordination. Low Energy. Mood Changes. Muscle Tremors. Muscle Weakness. Nightmares. Nystagmus, A Condition With Involuntary Eye Movements. Ringing In The Ears. Sensation Of. 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. Rarely, hydroxychloroquine can lead to anemia in some individuals. 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 visual side effects Hydroxychloroquine Oral Route Side Effects - Mayo Clinic, Common and Rare Side Effects for Plaquenil Oral Plaquenil 3 times a weekWhat are the parts of chloroquinePlaquenil lyme herx Get medical help right away if you have any very serious side effects, including sensitivity to light, vision changes e.g. blurred vision, seeing light flashes/streaks/halos, missing/blacked-out areas of vision, muscle weakness, numbness/tingling/pain of the arms/legs. Plaquenil Oral Uses, Side Effects, Interactions, Pictures, Warnings.. Hydroxychloroquine Plaquenil. Plaquenil Hydroxychloroquine Uses, Dosage, Side Effects.. Common side effects may include headache, dizziness, ringing in your ears; nausea, vomiting, stomach pain; loss of appetite, weight loss; mood changes, feeling nervous or irritable; skin rash or itching; or. hair loss. Hydroxychloroquine Plaquenil is used to treat malaria, lupus, and rheumatoid arthritis. Learn about side effects, warnings, dosage, and more. 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.