This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. For prevention of malaria in adults, one dose is usually taken once a week on exactly the same day of the week. What will happen if i don't take plaquenil Mycophenolate and plaquenil Common Side Effects of Chloroquine. Tell your doctor if any of the following side effects become severe or don't go away Loss of appetite; Mild dizziness; Mild diarrhea; Clumsiness; Mild headache In this study, no serious side effects related to chloroquine were reported. But during the first week of treatment with chloroquine, 1 participant stopped the study because of moderately severe digestive gastrointestinal side effects. 12. Additional information on side effects known to be associated with chloroquine can be found in the FDA-approved Full Prescribing Information for Chloroquine. 5. Because chloroquine is still being studied, information on possible side effects of the drug. Drug information provided by. To do so may increase the chance of serious side effects. For patients taking chloroquine to prevent malaria Your doctor will want you to start taking this medicine 1 to 2 weeks before you travel to an area where there is a chance of getting malaria. This will help you to see how you react to the medicine. One dose is taken beginning 2 weeks before traveling to an area where malaria is common, while you are in the area, and then for 8 weeks after you return from the area. Your doctor will tell you how many tablets to take for each dose. Side effects of chloroquine phosphate tablets Chloroquine - FDA prescribing information, side effects., Chloroquine Clinical Trials, Side Effects AIDSinfo Vertigo from plaquenil Chloroquine Phosphate. Uses. Chloroquine is used to prevent or treat malaria caused by mosquito bites in countries where malaria is common. Malaria parasites can enter. Side Effects. Precautions. Interactions. Chloroquine Oral Uses, Side Effects, Interactions.. Chloroquine Oral Route Proper Use - Mayo Clinic. Chloroquine Indications, Side Effects, Warnings -. Side Effects Nausea, vomiting, dizziness, stomach upset, and abdominal cramps may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. Remember that your. Avoid taking antacids and kaolin within 4 hours of taking this medicine. It is best to separate these medicines by at least 4 hours. Tell your doctor or health care professional right away if you have any change in your eyesight. Your vision and blood may be tested before and during use of this medicine. WHO lists some adverse side effects with chloroquine when used in malaria treatment, including headaches and gastrointestinal symptoms.