-Purpose. This study was aimed at developing co-encapsulated stealth nanoliposomes containing PSC 833, an efficient MDR modulator, and doxorubicin (DOX) in order to increase the effectiveness and decrease adverse effects of the anticancer drug. Methods. In attempt to increase the encapsulation efficiency of drugs, different methods for liposome preparation were tested and the effect of different parameters such as drug to lipid molar ratio, cholesterol mole percent and lipid compositions, were investigated. The final product with a lipid composition of EPC:DSPE-PEG2000:Chol (60:5:30 %mol) was prepared by thin layer film hydration method. After preparation of empty liposomes, DOX and PSC 833 were loaded using ammonium sulfate gradient and remote film loading methods, respectively. Physical characteristics of optimized liposomes (DOX/PSC-L) such as particle size, zeta potential, encapsulation efficiency, in-vitro drugs release and stability were evaluated. Furthermore, in vitro cytotoxicity study of various liposomal formulations as well as drugs, solutions against resistant human breast cancer cell line, T47D/TAMR-6, was evaluated using MTT assay. Results. The best formulation showed a narrow size distribution with average diameter of 91.3 ± 0.2 nm with zeta potential of -6 ± 1.2, the encapsulation efficiency for DOX and PSC 833 were more than 95% and 65.5%, respectively. In DOX-resistant T47D/TAMR-6 cells, dual-agent stealth liposomes showed significantly greater cytotoxicity (P < 0.05) than free DOX and liposomal DOX plus free PSC 833 treatments. Conclusions. Co-encapsulation of DOX and PSC 833 presents a promising anticancer formulation, capable of effective reversal of drug resistance, and should be explored further in therapeutic studies with animal tumor xenograft models.

Pharyngitis or sore thtableoat is an infl ammation of the oropharynx, which is one of the most common complaints seen by emergency physicians. The aim of this study was to extract the Salvia offi cinalis leaves, and to formulate the lozenge tablets in order to investigate a profi table dosage form. Methods: Lozenge tablets were prepared using wet granulation. The tablets also were evaluated for the physicochemical properties such as hardness, friability, weigh uniformity, thickness and disintegration time. Results:The selected formulation tablets containing 2.5% (w/w) gelatin as a binder and 0.1 ml of Salvia offi cinalis extract showed their physicochemical properties in the acceptable limits. Furthermore, palatability and the taste of the tablets were found desirable after testing by human volunteers. Salvia offi cinalis lozenge tablets were studied under accelerated stability conditions, and based on the stability test results it is suggested to package the tablets as single unit dosage form to drug content constancy. Conclusion: The results clearly indicate that the prepared lozenge tablets can be a good alternative for traditional forms of sage.