- Receiving enzyme-inducing antiepileptic drugs (enzyme inducing anti-epileptic drugs [EIAEDs]; e.g., phenytoin, fosphenytoin, carbamazepine, oxcarbazepine, phenobarbital, or primidone); any other potent cytochrome P450, family 3, subfamily A, polypeptide 4 (CYP3A4) inducer such as rifampin, glucocorticoids at greater than adrenal replacement levels, or St. John's wort; or receiving strong CYP3A4 inhibitors * Note: if these agents are discontinued, temsirolimus therapy can begin >= 7 days after discontinuation of such agent