I have basically no knowledge of reptiles specifically, but generally there are two things you do when someone consumes something toxic. You either A) get them to throw up, OR B) get them to consume a lot of water and other food to dilute the effect. In some only one of these options is good and the other is bad. Obviously you can't induce vomiting very well, so I'd look into feeding him a lot of other things that he likes, especially such with a lot of water content. But I'd research it first.