Most polymers used are based on lactic acid. D-lactic polylactic acid (DLPLA). A combination of Glycolide (GA), lactide (LA), ϵ-caprolactone (CL), and polyethylene glycol (PEG). And a combination of Poly L-Lactide, 50/50 Poly DL-Lactide-co-Glycolide and Polyvinyl Pyrrolidone. There are also some new ones based on salicylates, 

Talking about the drugs, they are either rapalogs (sirolimus, everolimus, temsirolimus, novolimus etc etc) or the less used paclitaxel. Both classes of drugs are proliferation/migration inhibitors, rapalogs inhibit mTOR while paclitaxel inhibit tubulin.