Even my dog's on ephedrine. It's common for large dogs to get urinary incontinence after spaying, and the vet recommended Thermo-Lean. Wondering why, I searched on the net and found that ephedrine is the most commonly prescibed treatment. (Thermo-Lean doesn't even have ephedrine, maybe he meant ThermoPro). Anyway, I was giving her one 8mg ephedrine tablet twice a day, then upped it to 2 tabs/twice a day. It worked for a while but the problem returned, so I took her to the vet again because I was afraid to give her more.
The vet said to raise her dosage to 24 mg 3x/day, and said that's still nowhere near the limit. The dog weighs about 85 pounds. That put the ephedrine hysteria in perspective for me.