Suppositories containing aminophenazone in quantities of 0.30 g/2 g were prepared by pouring technology. Two kinds of lipophilic suppository masses Witepsol W 35 and Estarinum 299 have been used as vehicles. Both of suppository bases are official in Ph. Hg. VII. As ingredients ten sorts of liquid tensides in concentrations of 5% have been applied. Experimental methods have been described: compression stability, disintegration time, special penetration time and drug release of suppositories by membrane diffusion method. Results of determinations have been discussed in the second part of the publication. On the basis of experimental results it has been established that the physical parameters of Massa Estarinum 299 had proved to be more advantageous. In 5% concentrations tensides softened consistency of suppositories favorably and shortened disintegration time beneficially in the case of both vehicles. The authors think that special penetration time is more suitable for measuring "disintegration" of suppositories of high powder content at 37 degrees C than the classical disintegration time.