Famotidine (FMT) is a competitive histamine-2 (H2) receptor antagonist that inhibits gastric acid secretion for the treatment of Gastroesophageal reflux disease. To study the promoting effect and mechanism of terpenes, including l-menthol, borneol, and geraniol, as chemical enhancers, FMT was used as a model drug. Attenuated total reflectance-Fourier transform IR spectroscopy (ATR-FTIR) and differential scanning calorimetry (DSC) were used to explore the effects of terpenes on the skin. Hairless mouse skin was mounted on Franz-type diffusion cell, and skin permeation experiment of FMT hydrogel was carried out. The results suggested that the thermodynamic activity influenced the permeability of the drug, and the main mechanism of terpenes to enhance skin permeation of the drug was based on increasing the fluidity of the intercellular lipids. Moreover, it was revealed that l-menthol simultaneously relaxed the packing structure and lamellar structure, whereas geraniol had a great influence on the lamellar structure only. Collectively, all terpenes had a promoting effect on skin permeation of FMT, indicating their potential as chemical enhancers to change the microstructure of stratum corneum and improve the permeation of FMT through the skin, and it has great potential to be used in transdermal formulations of FMT.
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