Alimta (generic: pemetrexed) is a prescription medication used to treat mesothelioma (a form of cancer) and non-squamous non-small cell lung cancer. Alimta belongs to a group of drugs called antifolate antineoplastic agents, which help stop cancer cells from multiplying.

This medication comes in an injectable form to be given directly into a vein (IV) over 10 minutes every 3 weeks by a healthcare provider.

Common side effects of Alimta include fever, diarrhea, and nausea.