At a Glance
Formulation: Combination antibiotic containing ampicillin:sulbactam in a 2:1 ratio; a 1.5 g vial contains 1 g/0.5 g and a 3 g vial contains 2 g/1 g. Confirm beta-lactam allergy and indication.
Vial preparation
| Vial | Sterile water to add | Approximate final volume |
|---|---|---|
| 1.5 g | 3.2 mL | 4 mL |
| 3 g | 6.4 mL | 8 mL |
Reconstituted total concentration is approximately 375 mg/mL (250 mg/mL ampicillin and 125 mg/mL sulbactam). Note displacement: added water and final volume differ.
IV infusion
Further dilute immediately with a compatible fluid to a validated final total concentration of 3–45 mg/mL, then administer according to the product label, commonly over 15–30 minutes. The referenced adult labelled regimen is 1.5–3 g every 6 hours, with sulbactam not exceeding 4 g/day. Children require weight-based age-specific guidance; renal impairment requires dosing interval adjustment.
Nursing checklist
Verify vial strength and allergy, calculate both components, prepare aseptically, select manufacturer-approved fluid, label final concentration and infusion time, and inspect solution. Stability depends substantially on fluid and concentration: dextrose preparations can have much shorter stability than saline. Never assume an eight-hour stability rule applies to every mixture.
Warnings
Assess prior severe penicillin/cephalosporin reactions, infectious mononucleosis, C. difficile diarrhoea, hepatic effects, renal impairment, pregnancy and lactation. Use cultures and local stewardship protocols.
Expanded Clinical and Nursing Notes
Ampicillin–sulbactam contains two active ingredients in a 2:1 mass ratio. A vial marked 1.5 g represents 1 g ampicillin and 0.5 g sulbactam, while a 3 g vial represents 2 g and 1 g respectively. When checking an order, distinguish the total combination dose from the ampicillin component; a prescription expressed in one convention cannot automatically be interpreted in the other.
Before Preparation
Confirm indication, documented penicillin or other beta-lactam allergy, current kidney function, prescription frequency and culture results. Check the vial strength, expiry date, manufacturer-specific reconstitution instructions and permitted diluents. Use aseptic technique and label the prepared solution with drug, total dose, diluent, concentration, preparation time and required administration time.
Administration and Monitoring
Use the infusion duration and stability specified for the local product; do not infer them from another manufacturer’s label. Observe for immediate hypersensitivity, infusion-site reactions and diarrhoea. Reassess antibiotic choice against microbiology and local resistance data. Renal impairment may require an interval adjustment, and neonatal regimens are not interchangeable with adult schedules.
Primary Product Label
DailyMed / FDA-linked prescribing information. Preparation instructions are formulation-specific and must be verified against the locally stocked product.
MedBodh clinical education for trained healthcare professionals; not a patient-specific order. Verify institutional policy, renal adjustment, neonatal and pregnancy/lactation guidance.