Hi Jeanie,
Yes, they are available in .5 mg tabs (bottle of 56). My doctor didn't even know about that and had suggested that I continue cutting them in half. I found out about the lower dosage on some web site. It's for people (like me) who can't tolerate the higher dosage. It's not very cost effective, since I think the prescription costs about the same regardless of the dosage (not sure--I just pay a copayment), but I got really tired of cutting them.
I am still taking them. My quit date was on Saturday, so I'm on day two. I had quit for a few weeks and then relapsed. If all goes well, I will probably continue on the .5 mg for at least a couple of months.
Cheers,
Rob