Does Raktajino contain caffeine or some other stimulant? How potent is it?
In the DS9 episode "...Nor the Battle to the Strong", Quark creates a decaffeinated version;
ODO: (re: the drink) What is it?
QUARK: (pleased with himself) The chief asked me to come up with a decaffeinated raktajino for Kira. I'm thinking of marketing it.
All watch as Kira takes a sip from the mug...
KIRA: (grimacing) Ugh... it's awful.
The implication (based on observation) is that it contains a lot of caffeine.