GPHN and epilepsy: As illustrated in Figure 6, the references selected in this study were mainly clustered in 14 categories: anxiety, tolerance, mitochondria, epilepsy, pharmacokinetics, midazolam, hypnotics, intranasal formulation, outcomes, cancer, gamma-aminobutyric acid (GABA), astrocytes, febrile seizures, GABAR, and gephyrin.