OBJECTIVE:To study the in vitro and in vivo bacteriostatic actions of Ganmaoreduqing oral liquid(GMRDQ) METHODS:The bacteriostatic actions of GMRDQ were observed with conventional in vitro and in vivo tests RESULTS:GMRDQ could significantly inhibit Staphylococcus aureus,?-hemolytic streptococcus,?-hemolytic streptococcus,Streptococcus pneumoniae and Hemophilus influenzae and it could protect mice from death induced by intraperitoneal injection of S aureus CONCLUSION:GMRDQ has in vitro and in vivo bacteriostatic actions