Figure 2 : Cough number obtained in the presence of low (2.5%,w/v) and high (5%,w/v) concentrations of methanolic extract of Cressa cretica Linn. compared to those obtained in the presence of saline (baseline) and codeine phosphate (0.03g/ml). Statistical differences between plant extracts, standard (codeine) with baseline values; ** p < 0.001. Statistical differences between cough number obtained in presence of plant extracts with that of codeine; ns: non significant difference. Statistical difference between both the extract concentrations; @: p < 0.01.