<prompt> All of the following statements about penicillin G are true EXPCEPT:It is actively secreted in tubulesIt is never administered orallyIt is effective against gram positive as well as some gram negative bacteriaIt acts by inhibiting cell wall synthesis  <response>: penicillin G is acid labile-destroyed by gastric acid. As such, less than 13rd of an oral dose is absorbed in the active form. Absorption of sod. PnG from i.m. site is rapid and complete; peak plasma level is attained in 30 min. ESSENTIALS OF PHARMACOLOGY page no. 718 