Oh I don't think he's 'drugged up to his eyeballs'! When Hendrix needed pain meds for his knees or fractured paw, it meant he was charging around like a lunatic (or typical Bengal!) instead of hobbling as he couldn't feel the pain.
The zylkene is simply a milk protein which just calms them and reduces their stress levels. It's also supposed to be useful with inappropriate peeing. I certainly wouldn't give it to my two if they were stumbling around in a drug induced stupor. To be honest, I see no difference in energy levels or their Bengal mischief-making personalities.... But they aren't trying to kill each other and the atmosphere is more harmonious. It's not permanent, it's just a way of retraining them to get along together again. Two dominant males can be difficult to handle!
I know mackattack is doing everything she possibly can to resolve the situation, and I'm sure she is looking at every possibility - if only theses bengals could tell us the problem! I'm convinced I'm ageing prematurely due to my guys