Although ibuprofen and other non-steroidal inflammatory drugs (NSAID) can be administered with pemetrexed in patients with normal renal function (creatinine clearance 80 mL/min), caution should be used when administering NSAID concurrently with pemetrexed to patients with mild to moderate renal insufficiency (creatinine clearance from 45 to 79 mL/min). Patients with mild to moderate renal insufficiency should avoid taking NSAID with short elimination half lives (e.g. ibuprofen) for a period of 2 days before, the day of, and 2 days following administration of pemetrexed. In the absence of data regarding potential interaction between pemetrexed and NSAID with longer half lives, all patients taking these NSAID should interrupt dosing for at least 5 days before, the day of, and 2 days following pemetrexed administration. If concomitant administration of an NSAID is necessary, patients should be monitored closely for toxicity, especially myelosuppression, renal, and gastrointestinal toxicity.