• Chloroquine phosphate tablets are an antimalarial and amebicidal drug.
• Chloroquine is rapidly and almost completely absorbed from the gastrointestinal tract, and only a small proportion of the administered dose is found in the stools.

Chloroquine is used to prevent or treat malaria caused by mosquito bites due to susceptible strains of P. falciparum, P.malariae, P. ovale, and P.vivax.

• Prophylaxis of malaria in geographic areas where resistance to chloroquine is not present.
• Chloroquine is also used to treat infection caused by a different type of parasite 
• Chloroquine phosphate tablets do not prevent relapses in patients with vivax or ovale malaria because it is not effective against exoerythrocytic forms of the parasites.

• Nausea, vomiting, abdominal cramps, headache, and diarrhea may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.
• Tell your doctor right away if you have any serious side effects, including: slow heartbeat, symptoms of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/sudden weight gain), mental/mood changes, hearing changes (such as ringing in the ears, hearing loss), easy bruising/bleeding, signs of infection (such as sore throat that doesn't go away, fever), signs of liver disease (such as severe stomach/abdominal pain, yellowing eyes/skin, dark urine), muscle weakness, unwanted/uncontrolled movements (including tongue/face twitching), hair loss, hair/skin color changes.
•  This medication may cause low blood sugar (hypoglycemia). Tell your doctor right away if you develop symptoms of low blood sugar, such as sudden sweating, shaking, hunger, blurred vision, dizziness, or tingling hands/feet. If you have diabetes, be sure to check your blood sugars regularly. Your doctor may need to adjust your diabetes medication.
•  This medication may cause serious eye/vision problems. The risk for these side effects is increased with long-term use of this medication and with taking this medication in high doses. Get medical help right away if you have any symptoms of serious eye problems.

•  Before taking chloroquine, tell your doctor or pharmacist if you are allergic to it; or to hydroxychloroquine; or if you have any other allergies.
•  Before using this medication, tell your doctor or pharmacist your medical history, especially of: a certain enzyme problem (glucose-6-phosphate dehydrogenase deficiency-G6PD), vision/eye problems, hearing problems, kidney disease, liver disease, regular alcohol use/abuse, skin problems (such as psoriasis), a certain blood disorder (porphyria), seizures.
•  If you have diabetes, this product may affect your blood sugar. Check your blood sugar regularly as directed and share the results with your doctor.
•  This medication may make you more sensitive to the sun. Limit your time in the sun
•  Before using chloroquine, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions: certain heart problems (heart failure, slow heartbeat, QT prolongation in the EKG), family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death).
•  Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Talk to your doctor about using chloroquine safely.
•  Older adults may be more sensitive to the side effects of this drug, especially QT prolongation.
•  During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
•  This drug passes into breast milk. Consult your doctor before breast-feeding.