Administration of Metronidazole via Gastrostomy Tube

Preparation and Administration Procedure

The American Society for Parenteral and Enteral Nutrition recommends using appropriate ancillaries, including syringes with connectors of a recognized standard (ISO 80369-3/"ENFit"), to avoid misconnection errors 1
Administering drugs individually through the enteral feeding tube is recommended, never mixing medications prior to administration due to the risk of drug-drug interactions, as suggested by the Clinical Nutrition guidelines 1, 2
Flushing the tube before, between, and after each drug administration using 30 mL of water is necessary to prevent tube occlusion, according to the Clinical Nutrition guidelines 1, 3

The Infectious Diseases Society of America recommends standard metronidazole dosing for C. difficile infection as 500 mg orally three times daily for 10 days when vancomycin or fidaxomicin are not available 5, 6
For fulminant C. difficile infection with ileus, the Infectious Diseases Society of America suggests intravenous metronidazole (500 mg every 8 hours) should be administered together with oral or rectal vancomycin 5, 7
Liquid formulations are generally preferred for G-tube administration to minimize the risk of tube occlusion, as recommended by the Clinical Nutrition guidelines 2
If using tablets, ensuring they are thoroughly crushed and dissolved is necessary to prevent tube blockage, according to the Clinical Nutrition guidelines 3

Tube occlusion can be avoided by always flushing with at least 30 mL of water before and after medication administration, as recommended by the Clinical Nutrition guidelines 1, 3
Drug-nutrient interactions can be minimized by administering metronidazole at least 1 hour before or 2 hours after enteral feeding if interaction is suspected, according to the Clinical Nutrition guidelines 2
Inaccurate dosing can be prevented by taking measures to ensure correct drug dosing and avoiding shaking the syringe to remove drug moat when using low-dose ENFit tip syringes, as suggested by the Clinical Nutrition guidelines 1
Cross-contamination can be avoided by never mixing different medications prior to administration through the G-tube, as recommended by the Clinical Nutrition guidelines 2

The site of the enteral tube tip affects drug delivery and efficacy, and G-tube delivers medication to the stomach, which is appropriate for metronidazole administration, according to the Clinical Nutrition guidelines 2
For patients with swallowing disorders or at risk of regurgitation, G-tube administration is safer than administration via upper gastrointestinal tract, as suggested by the Gut guidelines 8