Got this off of Google:

What Should You Do if Your Medication Has Been Exposed to Excessive Heat?

Your first step? Talk to your pharmacist and see what he or she recommends.
Your next step should be a call to your health insurance company or HMO, who may be able to replace your medication, or reimburse you for a replacement prescription.

Finally, if your pharmacy and insurance company are unable to help you, contact the manufacturer. According to drugmaker Abbott Laboratories' consumer hotline, it's possible -- not guaranteed however -- that Abbott and other drug makers may be able to offer some form of reimbursement for heat-damaged medications.

Hope that helps a little. Do you have a pharmacy that you could call to ask?