
Keywords: 4-Benzylpiperidine; Gel; Permeation; Rheology; Transdermal; Permeability coefficient; HPC; hydroxyl propyl cellulose; RP-HPLC; reverse phase high performance liquid chromatography; LVR; Linear viscoelastic region; MTT; 3-(4,5-dimethylthiazol-2-yl)-2,5-dip