RT Journal
A1 Howland J, Rohsenow DJ
T1 RIsks of energy drinks mixed with alcohol
JF JAMA
JO JAMA
YR 2013
FD January 16
VO 309
IS 3
SP 245
OP 246
DO 10.1001/jama.2012.187978
UL http://dx.doi.org/10.1001/jama.2012.187978
AB 
Energy drinks contain caffeine and often other substances such as guarana (containing guaranine, similar to caffeine), taurine (an amino acid), and sugar derivatives. The primary active ingredient is caffeine, usually with 80 to 141 mg of caffeine per 8 oz (equivalent to a 5-oz cup of coffee or 2 cans of soda).