On the WebMD website about Tikosyn under “Warnings” it says:
“Warnings
Though this medication often gives great benefits to people with irregular heartbeat, it may rarely cause a serious new irregular heartbeat. When starting, restarting, or increasing your dose with this drug, your doctor will recommend that you stay in the hospital for at least 3 days for proper monitoring.”
https://www.webmd.com/drugs/2/drug-18013/tikosyn-oral/details