I never forget to take any of my medications. In my opinion, it's very important that people get into some system that avoids doing that. I use various cheap tablet dispensers that you can buy from the chemists shop which I use to set up the various tablets morning and night for the next seven days. Just by looking in that I can see which tablets have or have not been taken.
There are some quite good ones around too. When I was unpacking various nick-nacks when I took my Father's stuff out of storage recently, I found one which has a tray for each day. You take the tray out of the bottom, swallow the pill(s) and then refill and put the tray in the top. Each tray is marked with the day and so you always know whether you've missed a day or not.
Of course, if you forget it for a week, you're in trouble!
Andy