Actually it's not. But that's a common misconception.
"Isn't Phentermine an Amphetamine?
Phentermine is a sympathetic amine, classified as an anorectic medication under schedule IV of the Drug Enforcement Agency's Controlled Substances Act. Although phentermine is a stimulant, it is not classified as an amphetamine. Amphetamines have much greater abuse potential, work primarily on dopamine receptors, and are mostly, if not entirely classified under schedule II. The lower the number, the more abuse potential the medication has."
I've used it, but didn't like it very much. All I wanted to do was sleep all day.
Well, I'm taking t3 too, 150mcg to be exact.

Also the main reason I'm taking the Phentermine is for the appetite suppression (DNP makes me *hungry*), but the energy doesn't hurt either.
"Does Phentermine speed up my metabolism?
Phentermine DOES have some thermogenic effect. What this means in plain English, is that it speeds up your metabolism. This effect lasts long after you feel any other effects from the medication. However, the thermogenic effect of phentermine and any other currently available obesity medications is minor compared to the effect on appetite. The major reason that phentermine results in weight loss, is that patients eat less. The thermogenic effect, on the other hand, may be useful in weight maintenance."
I've looked into it, believe me.
"Phentermine is the most commonly prescribed prescription appetite suppressant, accounting for 50% of the prescriptions. Part of this reason is because it's significantly cheaper than the other major FDA-approved diet drugs, Meridia and Xenical.
Phentermine first received approval from the Food and Drug Administration (FDA) in 1959 as an appetite suppressant for the short-term treatment of obesity."
It's been around for a long time and still going strong. I guess I'm going to worry about you using UA, and you're going to worry about me using Phentermine.
Thanx bro.