After a week off vetoryl, Reggie's cortisol rebounded to ~4.7 and his electrolytes are normal. So, looks like no lasting damage from potential over-treatment. He's also got borderline too much appetite, is urinating very copiously, and panting more than I'd expect although we are having a little warm spell. So we're resuming treatment, 50 mg twice a day for a month and then rechecking. I have enough 30 and 10 mg tablets on hand from earlier treaments to start out using them to add up to 50, but we are also going to see how he does on Chewy's 50mg compounded trilostane.