I did it on my taxes this year. I went through H&R Block and my preparer asked me if I had any, and I said heck yes! The caveat is that you can only claim the amount that is more than 10% of your adjusted income. So, say you made $50,000 and spent $7,000 on medical costs, then you can deduct $2000.
Tax Topics - Topic 502 Medical and Dental ExpensesIRS
If you itemize your deductions for a taxable year on Form 1040, Schedule A (PDF), you may be able to deduct expenses you paid that year for medical and dental care for yourself, your spouse and your dependents. For years beginning after December 31, 2012, you may deduct only the amount of your total medical expenses that exceed 10% of your adjusted gross income or 7.5% if you or your spouse is 65 or older.
http://www.irs.gov/taxtopics/tc502.html