I need a Windows 10 app (desktop) that will remind me to take medicine. I DO NOT want to use the calendar to do this.  I tried using Microsoft ToDo and I don't ever remember seeing a popup on my desktop to nag me.  It worked on my iPhone, but only while the app was running.  Once I rebooted my phone, the notifications seemed to stop.

Repeated recurring nags at a certain interval would be most welcome.