This really is not anything new, but NRG thinks it is, or maybe it is becoming more popular..

for those addicted to caffeine, via the daily mug of coffee, or maybe the 3 daily mugs of coffee, Yom Kippur is a day some people dread due to the withdrawal headaches... The basic advice often heard is to cut down on caffeine a few days before Yom Kippur.. The other advice is mainly to suck it up and deal with the headache.

Another, less popular, solution is caffeine suppositories.

NRG says that the suppository is not certified by the Ministry of Health and is sold in stealth. Some pharmacies are more open about it, while others are secretive and don't want to get caught selling this stuff. It even says this is more common in the American-Israeli crowd. There are two types of suppositories - 1 that has just caffeine and a second that has caffeine and codeine and acamol all bundled within to give a more powerful punch.

NRG says some rabbonim allow it, some say it should only be used by someone with great difficulty fasting...

this reminds me of the joke.. a few days before Yom Kippur Reuven goes into the pharmacy and asks for 200 caffeine suppositories. The pharmacist asks what Reuven could possibly need so many suppositories for. Reuven answers that in a few days it will be Yom Kippur and he is sponsoring the kiddush in shul...

and here is a funny video about caffeine suppositories..