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. Drug of choice for chloroquine resistant malaria Chloroquine retinopathy after drug cessation Chloroquine phosphate tablets 250 mg dosage Applies to hydroxychloroquine oral tablet. Along with its needed effects, hydroxychloroquine may cause some unwanted effects. 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 Hydroxychloroquine Plaquenil is a drug that is classified as an anti-malarial drug. Plaquenil is prescribed for the treatment or prevention of malaria. It is also prescribed for the treatment of rheumatoid arthritis, lupus, and the side effects of lupus such as hair loss, joint pain, and more. Effects of chloroquine? Chloroquine is a relatively well-tolerated. medicine. The most common adverse reactions reported are stomach pain, nausea, vomiting, and headache. These side effects can often be lessened by taking chloroquine with food. Chloroquine may also cause itching in some people. All medicines may have some side effects. 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. Chloroquine headache Chloroquine Oral Uses, Side Effects, Interactions., Hydroxychloroquine Plaquenil Side Effects & Dosage for. Why hydroxychloroquine for porphyria cutanea tardaHydroxychloroquine sulfate and prednisone togetherPlaquenil e malariaPlaquenil and pain reliefChloroquine phosphate for uronema marinum treatment Find patient medical information for Chloroquine Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Chloroquine Oral Uses, Side Effects, Interactions, Pictures.. Medicines for the Prevention of Malaria While Traveling.. Hydroxychloroquine MedlinePlus Drug Information. For all uses of chloroquine Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered. Signs of liver problems like dark urine, feeling tired, not hungry, upset stomach or stomach pain. Signs of low blood sugar like dizziness, headache, feeling sleepy, feeling weak. 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. In usual doses for treatment of malaria, headache, blurred vision, and lichenoid rash can occur. Chloroquine may block the entrance of potassium into the cells and primaquine also has an effect on blocking sodium channels.