I don't remember exactly when the last time he ate was, but I know it's been somewhere between a week and a week and a half. I'm going to a reptile expo tomorrow so I'm going to get more roaches to build my colony. I haven't been able to feed off my colony yet because I don't have very many adults. I think he'll improve quicker eating roaches. How long do you think it will take for the medicine to start working?