网页Antibiotic Study Guide & Cheat Sheet. When You See... Consider Using... GRAM POSITIVES. MSSA. Oral: cephalexin; IV: Oxacillin, nafcillin, cefazolin. MRSA. Oral: Bactrim, doxycycline, clindamycin, linezolid, tedizolid; IV: vancomycin, daptomycin, telavancin, dalbavancin, oritavancin, ceftaroline, tigecycline.