A Review and Comparative Study of Preservative Efficacy Test in the . . . A Review and Comparative Study of Preservative Efficacy Test in the United States, European, Indian, and Japanese Pharmacopeias and Implications for Asian Pharmacopeias Sara Sajjadi1, 2 , Fatemeh Shafizadeh1, 2 , Somayeh Hallaj-Nezhadi2*