Dofetilide and Trilaciclib interaction
Dofetilide and Trilaciclib: the Trilaciclib prescribing label flags this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Trilaciclib (COSELA) label · effective 2025-08-31
Increased plasma concentrations of dofetilide may cause serious ventricular arrhythmias associated with QT interval prolongation, including torsade de pointes.
Co-administration of COSELA may increase the concentration or net accumulation of OCT2, MATE1, and MATE-2K substrates in the kidney (e.g., dofetilide, dalfampridine, and cisplatin) [see Clinical Pharmacology ( 12.3 )].
Table 4: Potentially Significant Drug Interactions with COSELA Drugs Recommendations Comments Dofetilide The potential benefits of taking COSELA concurrently with dofetilide should be considered against the risk of QT interval prolongation.
Increased dofetilide blood levels may occur in patients who are also receiving COSELA.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.