Hello,
There are a few ways.
1. A academic fellowship will help you with the proper credentials.
2. Completing a residency (and getting that teaching certificate through your residency) is another option.
Sometimes it is the right place, right time, right position, right focus (ie specialty)
Another way is to be higher up admin and teach on the side.
In the meantime, teaching a pharmacy practice course once in a while as an adjuct or as an affiliated faculty is another way.
Goodluck and I commend your passion in teaching.