Augmentin Administration via Gastrostomy Tube
Augmentin can be administered through a gastrostomy tube using standard enteral medication administration protocols: flush the tube with 30 mL of water before administration, deliver each medication individually, and flush with 30 mL of water after each drug. 1
Administration Protocol
The ESPEN 2022 guidelines provide clear direction for medication administration through enteral feeding tubes 1:
- Flush before drug: Use 30 mL of water to clear the tube
- Administer medication individually: Never mix medications together before administration
- Flush after drug: Use 30 mL of water to ensure complete delivery and prevent tube occlusion
- Use ENFit-compatible syringes: Required by ISO 80369-3 standard to prevent fatal misconnection errors
Pharmacokinetic Considerations
Augmentin is well-absorbed from the gastrointestinal tract after oral administration 2. The FDA label indicates:
- Feeding state has minimal impact on amoxicillin absorption, though clavulanate absorption is slightly enhanced with food
- Safety and efficacy established in trials where Augmentin was given without regard to meals 2
- Gastrostomy tube delivery directly into the stomach provides appropriate drug delivery site, as the medication is designed for gastric administration
Dosing Remains Standard
Standard oral dosing applies when administering through G-tube 2:
- 250/125 mg q8h, 500/125 mg q8h or q12h, or 875/125 mg q12h depending on indication
- Peak concentrations occur approximately 1.5 hours after administration
- Half-life: amoxicillin 1.3 hours, clavulanic acid 1.0 hour
Critical Pitfalls to Avoid
Do not mix Augmentin with enteral formula or other medications before administration, as this risks drug-drug interactions and tube occlusion 1. The guideline specifically warns that phenytoin and other drugs can bind to enteral formulas and feeding tubes themselves.
Ensure adequate flushing volume: The 30 mL water flush is evidence-based to reduce tube occlusions, particularly important for small-diameter tubes 1.
Use proper syringe technique: With low-dose ENFit syringes, do not shake to remove drug moat, as this can alter dosing accuracy and expose personnel to medication 1.
Tube Material Considerations
Polyurethane gastrostomy tubes are preferable to silicone tubes for medication administration, as they maintain patency better and allow continued tube use 1. This is particularly relevant for long-term antibiotic administration.