'masheadatronic' asked for a link. Sorry i do not have one. I read this in the "Australian Drug-X Guide" writen by a doctor who believes that all people should have information about drugs, not just elite doctors. It was in the amphetamine section of the book. My parents gave me the book, knowing that i am interested in drugs (and taking them). The book covers all prescription drugs and illegal drugs.
I follow the directions on the packets of Urals, and take 2 every 3 hours about 15 minutes before i drop. I find the rush is a bit more intense, but lasts much longer than normal, 50% longer in my opinion, but the come down is like taking 1.5 pills - as the moderator said, you rush longer, but you loose more seratonin.
The urals contain :Sodium bicarbonate 1.76 g, sodium citrate (anhyd.) 0.63 g, citric acid (anhyd.) 0.72 g, tartaric acid.
I asked a chemist if Eno's (stomach alkaline netralizers) work the same, and she said no, but she may have wanted to sell me the Ural's which are much more expensive than Eno which i can by from the supermarket.
In my original message i said coke lasted 50%-100% longer. I was pretty drunk at the time so it was not a very scientific experiment, so thats why i put a big variance in the extra duration - but it defiently made the coke last a lot longer than usual, which is great, because coke is very annoying going up and down all the time as you may know.
I use the Urals to take less drugs - but of course like everything in life they can be used to cause more damage. Moderation in everything i guess.