While it was approved for marketed in several countries, it failed a Phase III trial in the U.S. due to toxicity and never received FDA approval. It was discontinued by Wyeth in 1997 because of the risk of severe liver toxicity and death. It was sold under the tradename Alredase.
^Sestanj K, Bellini F, Fung S et al. (March 1984). "N-[5-(trifluoromethyl)-6-methoxy-1-naphthalenyl]thioxomethyl]- N-methylglycine (Tolrestat), a potent, orally active aldose reductase inhibitor". J. Med. Chem.27 (3): 255–6. doi:10.1021/jm00369a003. PMID6422042.CS1 maint: Explicit use of et al. (link)
^Kador PF, Kinoshita JH, Sharpless NE (July 1985). "Aldose reductase inhibitors: a potential new class of agents for the pharmacological control of certain diabetic complications". J. Med. Chem.28 (7): 841–9. doi:10.1021/jm00145a001. PMID3925146.