In this thesis morphological characterization of samples of posaconazole was carried out with the following techniques: optical microscopy, scanning electron microscopy, low-angle laser light scattering and dynamic light scattering. By preparing suspensions of posaconazole with one of the surface-active agents (sodium dodecyl sulfate, cetyltrimethylammonium bromide, polysorbate 80 and polyoxyethylene lauryl ether) either with one of the polymeric stabilizer (poloxamer 407 and hydroxypropyl cellulose), their effect on the stabilization of the suspension was determined. Suspensions were made in the concentration ratios of the active and auxiliary substances 10:1 as well as 100:1. Suspensions were characterized by means of zeta potential determination, optical microscopy, appearance and resuspensibility observation. Afterwards posaconazole suspensions with the combination of one surfactant and the polymer in a ratio of 100:1:1 were prepared and characterized. Parallel with the examination of the properties of the suspensions, the contact angle of posaconazole comprimates was mesured. The contact angle was determined for water and all of the individual excipients and combinations of both polymers with the tested surfactants. The posaconazole suspension with hydroxypropyl cellulose and sodium dodecyl sulfate is a suspension with optimal properties: the highest zeta potential, no agglomerates and short time of resuspensibility. Besides it is the combination of two excipients that has the lowest contact angle. Therefore this suspension could be proposed for development of final drug product.