Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria. Hydroxychloroquine allergic reaction Ciprofloxacin and hydroxychloroquine Serious side effects. blurred vision or other vision changes. ringing in your ears or hearing loss. angioedema, or rapid swelling of your skin. hives. mild or severe bronchospasm that causes trouble breathing. sore throat. unusual bleeding or bruising. blue-black skin color. muscle weakness. hair. Check with your doctor immediately if any of the following side effects occur Incidence not known. Blistering, peeling, loosening of the skin blurred vision or other vision changes chest discomfort, pain, or tightness cough or hoarseness dark urine decreased urination defective color vision diarrhea difficulty breathing Common Side Effects of Plaquenil. Tell your doctor if any of the following side effects, as they may be indications of a more serious reaction. Hydroxychloroquine 200 mg-INV, white, oblong. 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. Side effects of plaquenil 400 mg Side Effects of Plaquenil Hydroxychloroquine, Warnings, Uses, Hydroxychloroquine Oral Route Side Effects - Mayo Clinic Hydroxychloroquine uctdChloroquine antimalarial side effects Hydroxychloroquine Side Effects. Get emergency medical help if you have signs of an allergic reaction. Hydroxychloroquine 200 mg-TEV, white, oblong. Hydroxychloroquine 200 mg-WAT, white, oval. Hydroxychloroquine - Side Effects, Dosage, Interactions.. Plaquenil Hydroxychloroquine - Side Effects, Dosage.. Plaquenil - Uses, Side Effects, Interactions -. Drug Information on Plaquenil, Plaquenil Sulfate, Quineprox hydroxychloroquine includes side effects, uses, drug interactions, dosage, drug pictures, overdose symptoms, and what to avoid. The usual starting dose of Plaquenil is 200 mg twice a day or 400 mg once a day, administered orally, in people weighing 80 kg or more. The usual dosage works for most people who take Plaquenil, but it is possible to increase or decrease the dose based on individual needs. It's important to watch for possible side effects and toxicity. Common hydroxychloroquine 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.