Alcoholics using other drugs especially stimulants is nothing new. Here the A has been using adderall among other things. He's addicted to sports drinks using them before almost all physical activity and workouts. He supposedly dabbled with cocaine off and on for decades but judging by his other addictive behaviors/habits the 1980s are still calling.
I guess like many addicts they use different substances to offset each other.
Be careful, stimulants by themselves let alone with alcohol can quickly put a person into a highly agitated & volatile state . Especially if they already have temper or patience issues.