AbstractA thin-layer chromatography (TLC)-densitometric method was developed to determine N-(hydroxymethyl)nicotinamide in tablets and basic solutions along with nicotinic acid. Analysis was performed on silica gel F254 plates using chloroformethanol (2 + 3, v/v) mobile phase. The densitometric observations were made at 260 nm. The results showed good precision and accuracy; relative standard deviation was 2.37, and recovery ranged from 97.60 to 100.82. The limit of detection was 0.1 g/spot, while the linearity range was from 0.2 to 1.75 g/spot. Applicability of the newly developed method was tested for determination of N-(hydroxymethyl)nicotinamide in the preparation Cholamid<sup/>. Densitometric measurements were used to evaluate stability of N-(hydroxymethyl)nicotinamide in basic solutions. It was found that decomposition corresponded to first-order reaction kinetics. The computed kinetic and thermodynamic parameters at 30C were as follows: k 0.00675/min, t0,5 1.71 h, t0,1 0.26 h, and Ea 44.75 kJ/mol.