(a)
(b)
Figure 4: Microscopic appearance of the films with Sanatyl and the same concentration of ibuprofen (magnified 7.5x, bar 1000 μm): (a) film with suspended drug (0.5-Ibu-2), (b) film with drug incorporated as acetone solution (0.5-Ibu-1); arrows mark points where the thickness of films was measured.