Coyne is correct in pointing out that the Weintraub1 trial used phentermine resin rather than phentermine hydrochloride. This reference was an error in my commentary, and I apologize for the unintentional mistake. He is also correct in stating that the clinical significance of this difference is unknown.
Kushner R. Phentermine—Resin or Salt— There Are Differences-Reply. Arch Intern Med. 1997;157(20):2382. doi:10.1001/archinte.1997.00440410115016