Is it ok to take phentermine with plexus slim?

Plexus Slim is: Reported to be a 'natural' supplement that enhances weight loss. Apidex- p (phentermine) is a stimtulant that suppresses appetite. I recommend weight loss the old fashioned way for my patients- exercise ; healthy eating w portion control. I am concerned that you feel the need to be on two different types of weight loss programs at the same time.