Avycaz Cannot Be Given Intramuscularly
Avycaz (ceftazidime-avibactam) is only approved for intravenous administration and must never be given intramuscularly. The FDA-approved prescribing information explicitly states that all doses are administered by intravenous (IV) infusion over 2 hours 1.
Route of Administration
The drug label is unequivocal on this point:
- Adults: 2.5 grams IV infusion over 2 hours every 8 hours 1
- Pediatrics: Weight-based dosing IV infusion over 2 hours every 8 hours 1
- All renal adjustment doses: Administered intravenously over 2 hours 1
Why IV Only
Avycaz is supplied as a dry powder that must be:
- Constituted with 10 mL of sterile solution
- Further diluted to 50-250 mL before administration
- Infused intravenously over 2 hours 1
The constituted solution is explicitly labeled as "not for direct injection" 1, which further emphasizes that this medication requires careful preparation and controlled IV infusion.
Clinical Context
The published literature consistently describes IV administration in all clinical studies. Research evaluating continuous infusion versus intermittent infusion still maintains the intravenous route 2. Even studies examining CNS penetration used intravenous administration to achieve therapeutic CSF concentrations 3.
Critical Pitfall to Avoid
Do not attempt IM administration of Avycaz under any circumstances. The formulation is not designed for intramuscular use, has not been studied via this route, and the large volume required after reconstitution makes IM injection impractical and potentially harmful. If IV access cannot be established, alternative antibiotics appropriate for IM administration should be selected instead.