When should we administer metron 100 ml injection to patient on MHD which time of the session. Does it get cleared from Dialyzer
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Metronidazole (Metron 100 mL IV) in Maintenance Hemodialysis (MHD) Patients
Is Metronidazole Cleared by the Dialyzer?
Yes — significantly cleared. Metronidazole is explicitly listed in Comprehensive Clinical Nephrology (Table 77.7) among drugs significantly cleared by hemodialysis that require administration AFTER dialysis or a supplemental dose after dialysis.
Quantitatively (from FDA-approved prescribing data):
- A 4–8 hour HD session removes 40–65% of the administered metronidazole dose, depending on the dialyzer membrane type and session duration
- Regenerated cellulose membrane: clearance ~107 mL/min (extraction ratio 0.65)
- Cuprophan membrane: clearance ~72 mL/min (extraction ratio 0.44)
- Its active metabolites are cleared to a similar extent as the parent drug
When Should It Be Administered?
| Scenario | Recommendation |
|---|---|
| Ideal | Administer metronidazole after the HD session is complete — this ensures full therapeutic drug levels are maintained and not immediately dialyzed out |
| If timing cannot be separated from dialysis | Give the dose, but administer a supplemental/repeat dose after the session ends to compensate for drug removed by dialysis |
| Dosing interval | Standard: 500 mg (100 mL) IV every 8 hours — adjust timing so at least one dose falls post-dialysis |
Key Clinical Points
- No dose reduction is required in ESRD/anuric patients on MHD — the accumulated metabolites are cleared by dialysis itself, so the standard dose applies.
- Supplemental dosing post-HD is the standard practice when dialysis timing overlaps with drug administration.
- Hepatic impairment (common in critically ill dialysis patients) requires dose reduction by 50% — not renal failure alone.
- CAPD (peritoneal dialysis) removes only ~10% over 7.5 hours — no dose supplement needed for CAPD patients.
- The drug's half-life is ~8 hours in healthy individuals; in dialysis patients, metabolite accumulation can occur but is cleared by the dialysis session itself.
Bottom line for practice: Always give metronidazole 100 mL IV after the MHD session whenever possible. If the drug must be given during dialysis, give a supplemental dose once the session ends.
- Comprehensive Clinical Nephrology, 7th Ed. — Table 77.7: Dialysis Clearance of Drugs
- Baxter/Pfizer Metronidazole Injection USP prescribing information
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