What should I know about primaquine before taking it?

Before taking primaquine, you should know that it can cause temporary changes in vision, so use caution when driving. You may also feel dizzy or drowsy. You should also monitor the color of your urine. If it becomes darker, you need to notify your physician. During treatment take precautions against mosquitoes, the main carriers of malaria. Primaquine also may cause heart rhythm changes in people with heart disease or heart rhythm disorders. Your doctor may give you tests to monitor your heart while you are taking primaquine.