ALIMTA Â®. Generic name: Pemetrexed. Alimta is the trade name for the generic drug name Pemetrexed. In some cases, health care professionals may use the trade name Alimta when referring to the generic drug name Pemetrexed. Drug type: Alimta is an anti-cancer (antineoplastic or cytotoxic) chemotherapy drug.This medication is classified as an antimetabolite.n some cases, health care professionals may use the trade name Alimta when referring to the generic drug name Pemetrexed. Drug type: Alimta is an anti-cancer (antineoplastic or cytotoxic) chemotherapy drug.