In-situ high-pressure room temperature synchrotron X-ray diffraction and optical Raman and infrared spectroscopy were used to examine the structural properties, equation of state, and vibrational dynamics of diaminotetrazolium nitrate (HDAT-NO3)The X-ray measurements show that the pressure-volume relations remain smooth to 12 GPa. X-ray diffraction measurements at pressures above 12 GPa were not possible in this study because of sample decomposition resulting from several factors. X-ray diffraction reveals no indication of a phase transition to at least 12 GPa, but slight variations in the c/b unit cell ratio suggests modifications within the hydrogen bonding sub-lattice. Vibrational measurements show the ambient phase of HDAT-NO3 to remain the dominant phase to 33 GPa.