Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Other medications can affect the removal of abemaciclib from your body, which may affect how abemaciclib works. Examples include azole antifungals (such as ketoconazole, itraconazole, voriconazole), macrolide antibiotics (such as clarithromycin), HIV protease inhibitors (such as atazanavir, nelfinavir, indinavir), rifamycins (such as rifampin, rifabutin), drugs to treat seizures (such as phenytoin, carbamazepine, phenobarbital), nefazodone, ritonavir, St. John's wort, telithromycin, among others.

This medication can slow down the removal of other medications from your body, which may affect how they work. An example of an affected drug is dofetilide, among others.