Thus, regimens effective against both streptococci and staphylococci are used; for example, one of the following may be used: Dicloxacillin or cephalexin if methicillin-resistant Staphylococcus aureus (MRSA) is not likely TMP / SMX, linezolid, minocycline, or clindamycin if MRSA is suspected (see treatment of cellulitis) Necrotizing fasciitis should be treated in an intensive care unit.