This app was mentioned in 2 comments, with an average of 1.50 upvotes
This one is great: It keeps repeating the notification until you expand it and press "Take all". You can also skip the dose, but that's up to you, I guess.
https://play.google.com/store/apps/details?id=ru.pilluling.android
Pilluling to remind you to take any kind of medication, you can customize notifications. It is great.