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Terbinafine-d₃ is intended for use as an internal standard for the quantification of terbinafine by GC- or LC-MS. Terbinafine is a broad-spectrum antifungal agent that has activity against T. rubrum, T. mentagrophytes, T. verrucosum, E. floccosum, M. canis, A. fumigatus, and S. schenckii (MIC₅₀s = 0.003-0.8 μg/ml). It selectively inhibits C. albicans squalene epoxidase over rat liver epoxidase (IC₅₀s = 0.03 and 77 μM, respectively). Terbinafine (90-120 μM) induces cell cycle arrest at the G₀/G₁ phase in COLO 205 tumor cells and human umbilical vein endothelial cells (HUVECs). Formulations containing terbinafine have been used in the treatment of nail and skin fungal infections.

Terbinafine-d3 HCl (N-methyl-d3) (CAS# 1310012-15-7) is a useful isotopically labeled research compound.

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