[CounterJihadReport] The drug of choice for ISIL members is an amphetamine known as Captagon. A Lebanese Captagon manufacturer who supplies drugs for various groups fighting in Syria says that those who consume the drug 'have a thirst for fighting and killing and will shoot at whatever they see. 'They lose any feeling or empathy for the people in front of them and can kill them without caring at all. They forget about their mother, father, and their families.'
Although US military personnel (usually pilots) utilize "go-pills," I suspect ISIL has more relaxed dosing protocols.