Microbiology All India exam c85086ea Drugs least effective against MRSA A Teicoplanin B Meropenem C Quinupristin D Linezolid High-Yield Explanation Drugs effective against MRSA are SS Cotrimoxazole, SS Ceain cephalosporins, SS Vancomycin, SS Teicoplanin, SS Dalfopris n, SS Quinupris n SSLinezolid.