to add to this, there is a reason 'Four Loko' was ultimately banned in it original recipe back in 2010. there was multiple occurrences of people being hospitalized and even some possible deaths resulting from the consumption of "caffeinated alcoholic beverages"
please drink responsibly, and dont mix your drugs. YES CAFFEINE IS A DRUG!
same with simple things like headache meds (tylenol, asprin, etc) please do not mix alcohol and any medications of other drugs unless you are cleared by a doctor, or have EXTENSIVE experience and knowledge on the specifics