I have used this app for the past 10 years, as a student and in practice.
This is a great app, very easy to use, and I frequently show its information to my patients.
The only thing that I find a bit negative is that the duration of doses is frequently absent but this is the case with many apps and references anyway.
Well worth the money for Internal Medicine, family Medicine, and Emergency Medicine.
Mark Na about 5 Minute Clinical Consult, v1.16