Welcome to Plumb's Veterinary Drugs. Plumb’s Veterinary Drugs, accessible on your tablet, smartphone, and computer, is continually updated so you have the most current information available to help you make more informed drug decisions. Mylan manufactures AMPICILLIN for Injection, USP (Unasyn) in strengths of 1 g Ampicillin as sodium salt and 05 g Sulbactam as sodium salt2 g Ampicillin as sodium salt and 1 g Sulbactam as sodium salt10 g Ampicillin as sodium salt and 5 g Sulbactam as sodium salt Detailed Ampicillin / Sulbactam dosage information for adults and children. Includes dosages for Bacterial Infection, Sinusitis, Skin or Soft Tissue Infection and more; plus renal, liver and dialysis adjustments. Available Products. Ampicillin Sodium and Sulbactam Sodium powder for solution for injection, Pfizer, 1.5 gram, ADD-Vantage vial, 10 count, NDC 00409-2689-01 Ampicillin/sulbactam is a combination of the common penicillin-derived antibiotic ampicillin and sulbactam, an inhibitor of bacterial beta-lactamase. AMPICILLIN/SULBACTAM (UNASYN ®) The authors make no claims of the accuracy of the information contained herein; and these suggested doses are not a substitute for clinical judgment. Detailed dosage guidelines and administration information for Unasyn (ampicillin sodium and sulbactam sodium). Includes dose adjustments, warnings and precautions. DESCRIPTION. UNASYN is an injectable antibacterial combination consisting of the semisynthetic antibacterial ampicillin sodium and the beta-lactamase inhibitor sulbactam sodium for intravenous and intramuscular administration. Unasyn (ampicillin sodium/sulbactam sodium) is a combination antibiotic indicated for the treatment of infections due to susceptible strains of microorganisms. 1.5 g (1 g ampicillin and 0.5 g sulbactam) or 3 g (2 g ampicillin and 1 g sulbactam) IV/IM every 6 hours. For inpatient, non-ICU patients with community-acquired pneumonia (CAP), use in combination with a macrolide antibiotic (azithromycin, clarithromycin, or erythromycin) or with doxycycline.