STILNOCT® contains zolpidem tartrate, a gamma-aminobutyric acid (GABA) A agonist of the imidazopyridine class. STILNOCT® (Zolpidem tartrate prolonged release tablets IP) is available in 6.25 mg and 12.5 mg strength tablets for oral administration. It is indicated for the short term treatment of insomnia, characterized by difficulties with sleep onset and/or sleep maintenance.