Thank you both for the replies.
Yes the pills are 25mg and they are cut in half, so it's a 12.5mg dose given every other day. My cat weighs 13.8 lbs.
Today is pill day, so this will be his second dose. He seemed ok after the first one, didn't notice anything unusual and he has been up and about more than he was 3 days ago, although he still has his sneezy sounding cough.
I really appreciate the help, I feel a bit better about giving him the med. now that I've received some input from others that have had experience with it.
Thanks again