QST 150mg Injection is an antiparasitic drug that is used to treat malaria. It can also be used to relieve and prevent leg cramps at night. It works by killing the malaria-causing parasite and preventing the spread of infection. QST 150mg Injection is given by a healthcare practitioner. Please don't self-medicate. Use insect repellent lotions on regions of your body that aren't covered by clothing to lower your risk of being bitten by mosquitos. Mosquito repellant should be used to eliminate any mosquitos that may have gotten inside rooms despite the screens. When you're outside after dusk, dress in light-colored, covered apparel.