About Diet Pills

One dieter shares:

Didrex is the “speediest” diet pill out there. And also a lot less frequently precribed, so you may not see the same economies of scale compared to a drug like phertermine. Where are you getting these prices? From the little price shopping I’ve done, generic phendimetrazine (brand names Bontril, Prelu-II) isn’t a whole lot more expensive than generic phentermine. I don’t know anything at all about the price of Didrex or its generic equivalents.

Phentermine is a C-IV controlled substance; phendimetrazine (Bontril) and Didrex (benzphetamine) are both in C-III, because they’re believed to have a higher abuse potential than the C-IV anorectic drugs like phentermine, mazindol and diethylpropion. (As a comparison,
dextroamphetamine/Dexedrine is a C-II drug and requires special Rx blanks, no refills, and is much more tightly controlled.) While there’s no doubt about dextroamphetamine’s abuse potential, the classification of the other drugs was pretty much a subjective decision on the part of the Drug Enforcement Administration.

You would expect almost complete cross-tolerance between these drugs, since they all act more or less identically. I’ve just tried Bontril after being on phentermine for about a year, and I frankly don’t notice much of a difference subjectively (stimulation) or objectively (my weight).
But your mileage may vary–I’m pretty impervious to most drug’s side effects. Benzphetamine is metabolized in part to methamphetamine and amphetamine, which may explain its reputation for having a greater abuse potential than phentermine, and also has the drawback of making
you test positive for amphetamine and methamphetamine in urine drug screens. I’ve never tried it, so can’t share my own experience with it.