Coffee-based, not a typical energy drink
Starbucks Doubleshot Energy, Coffee is built around real espresso rather than the guarana or synthetic-caffeine blends most energy drinks use. A 15 fl oz can carries 135 mg of caffeine, roughly the same as two Solo shots of Starbucks Espresso (150 mg), which matches the “doubleshot” in the name.
Weaker than the big energy-drink names
Despite the “energy” branding, this can carries less caffeine than a similarly sized Monster Energy Original, which packs 160 mg into 16 oz. It has less caffeine per ounce than a standard Red Bull too: a 12 oz Red Bull carries 114 mg in a smaller can. It is nowhere near an energy shot like 5-hour Energy, which packs 200 mg into under 2 oz.
A coffee-flavoured energy drink
Because it’s marketed alongside energy drinks but built from actual espresso, Doubleshot Energy sits in a middle category: real coffee flavour and a coffee-scale caffeine dose, packaged and sold like an energy drink for convenience. That distinguishes it from drinks that use guarana extract or synthetic caffeine to hit a similar number without any coffee in the ingredient list at all.
Where it fits in a day
At 135 mg, a can sits well under the 200 mg single dose EFSA assessed as safe for healthy adults. Two cans, 270 mg, still leave room under the 400 mg daily figure the FDA cites for healthy adults. In pregnancy, where ACOG uses a 200 mg daily ceiling, one can uses just over half the day’s allowance; the FDA also notes that medical experts advise against energy drinks for children and teens.