Does insulin still work if you drink it?

nothing when my little brother learnt how to undo zips he got into my bag and sucked insulin fron a cartridge and when we took him to hospital and they told use that your stomach acid is stronger than insulin and will destroy it before it can have any affect on you

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That is perfectly true.

Insulin is a type of protein (a hormone), and as all the other protein, insulin is broken down into amino acids (which make up the proteins), started in the stomach, finished in the small intestine. It is absorbed from the small intestine for further use in the body.

Once it is broken down, it becomes just a number of harmless amino acids. That is the reason why insulin has to be injected. If it goes through digestion it is no longer a 'hormone'; it loses all the function of an insulin hormone has, including its affects on blood glucose.