Microscopic morphologies and particle size distributions of microspheres varied with the use of Eudragit and sucrose stearate concentrations. Morphologies of microspheres: The concentration of sucrose stearate was 1%, and Eudragit was 4.5% (A), 7.5% (B), and 10.5% (C), respectively; the sucrose stearate was 4%, and Eudragit was 4.5% (D), 7.5% (E), and 10.5% (F), respectively; the sucrose stearate was 7%, and the Eudragit was 4.5% (G), 7.5% (H), and 10.5% (I), respectively. Particle size distributions of microspheres with 1% (J), 4% (K) and 7% (L) sucrose stearate.