YES!!! You can write them off if the exceed 7.5% of your adjusted gross income. We have been doing this going on our 3rd year now. After our son was born in 2004, was a preemie, and spent 2 weeks in the NICU, we had bills coming out the "whazoo"!!! My mother-in-law told us about writing them off on our taxes. We do our taxes ourselves with Turbo Tax Delux. It is very easy.
You can write off the following:
Medical, Dental, Vision Insurance Premiums paid out
Dr. Visit Co-Pays
ER Visit Co-Pays
Any other out of pocket expenses
Mileage to and from Dr. Offices and Hosptials
I keep a spread sheet with all of the above categories in the top rows and then all our family listed in columns. I have a little notebook in my car that I write mileage down every time I go to the Dr. for myself, kids, and my husbands trips back and forth to the hospital when we had our kids. I update it monthly so it is complete come tax time. The totals are already there and all we have to do is plug them in to Turbo Tax when we get to that section. A little hint that my 500 miles I put on my car last year gave us an extra $200 back when I added up all my mileage for Doctors.