Tykosin (Dofetilide) and kidney disease?

[GooseEggs]

My mother has stage 3 kidney disease, and was just started on Tykosin. Her labs for creatinine and GFR are already worse after the initial 3 day dosing...anyone have similar experience? What happened? Any chance of improving the lab results once she's off the Tykosin? She just had 2nd ablation and already had afib twice in the 2 weeks since...so Dr. put her on Tykosin as a temp or long term plan (TBD). She's allergic to amiodarone (pulmonary fibrosis).

Thank you!