<prompt> Answer this question truthfullyWhat drug should patients taking drugs that are excreted via the renal tubular basolateral OAT channels such as Penicillin, Cephalosporins, and Methotrexate be monitored carefully while taking?  <response>: <reason> Patients taking drugs that are excreted via the renal tubular basolateral OAT channels such as Penicillin, Cephalosporins, and Methotrexate should be monitored carefully while taking Probenecid. 