Oh dear, this has happened to me, too....the option of calling the drug manufacturers is a good one, but the problem is that it takes 2-3 weeks to get that ball rolling in most cases.
What my pdoc did was called the drug rep for the drug I needed (seroquel) and had them drop off samples to get me through. If you can tell me what meds you are on, I may be able to offer more help....
--Angela