Meds.

Meds. is a simple way to track your medications. Add what you take, mark doses as done, and see your history. 
Your data is stored locally on your phone, it never leaves your device, so no one can see your data.
When you delete a medication, all the records tied to it are deleted too.
I built this because I needed something simple. Meds just does one thing, and stays out of your way.
Open source at https://github.com/Ralph0210/Meds.