They typically need to be given ~150mg, once a day, and it'll last for two weeks. The drug is very water insoluble, becomes almost like a paste, not suitable for tube feeding. And yes, this is for for real lifesaving medical research.
The best we can come up with right now is putting them to sleep, mixing the powder into Nutella, and putting it under their tongue. The idea being they'll wake up and swallow the mixture.