Well being that they have to be provided by a doctor, via prescription, your selling them would be illegal. They are prescription only products that can only be given by a physician and their usage must be monitored by a doctor.
I understand you want to recoup some of your losses and help someone else at the same time, but it is illegal to do so and you could end up in serious trouble facing fines and/or jail time for doing so.
Your best bet would be to dispose of them, and if you aren't sure how to get rid of them properly, then return them to the doctors office, or take them to a pharmacy and they will do so for you.
There are many hazards from second hand drugs, though I am sure you didn't do anything to them, there are those who would contaminate them to harm others, there are proper storage issues to worry about, as well as the experition dates. Tampering, improper storage, or the passing of the expiration dates could all affect the drugs efficacy for another user. That is why these types of meds are not allowed to be sold on the general, over the counter market.
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My information is not guaranteed correct. I do not get them right all the time, but I do enjoy the hunt~