Thats not what taper off means. If you stop some meds quickly, you can suffer side effects. Google the
phentermine to see what I mean.
Point is - don't know if you have one, two, or three docs - but they need to know what you are taking.
And its possible the Adderall could help you lose the weight. I think in some ways its safer then the phentermine. But, the two maybe should not be taken together.