Tigecycline Dosage in Liver Impairment
Tigecycline, an IV glycylcycline antibiotic, requires dosage adjustments for patients with moderate to severe hepatic impairment due to its primary metabolism and biliary excretion via the liver. No adjustment is needed for mild impairment (Child-Pugh A).[1][2]
- Loading dose: Remains 100 mg for all hepatic categories.
- Maintenance dose:
| Hepatic Impairment | Adjustment |
|--------------------|------------|
| Mild (Child-Pugh A) | No change: 50 mg IV q12h |
| Moderate (Child-Pugh B) | Reduce to 25 mg IV q12h after 100 mg load |
| Severe (Child-Pugh C) | Reduce to 25 mg IV q12h after 100 mg load |
End-stage liver disease (e.g., awaiting transplant) follows severe guidelines. Monitor for reduced efficacy with lower doses.[1][3]
Why Adjustments Are Needed
Tigecycline undergoes minimal renal clearance (about 15-20%); over 50% is excreted unchanged in bile. Hepatic dysfunction prolongs half-life (from ~27 hours normal to ~50+ hours in severe cases), raising exposure risk without dose cuts. Pharmacokinetic studies in Child-Pugh B/C patients show 2-3x AUC increases without adjustment.[2][4]
What About Kidney Problems or Dialysis?
No tigecycline adjustment for renal impairment, including dialysis, as it is not hemodialyzable. Supplemental doses post-dialysis are unnecessary.[1][3]
Key Warnings and Monitoring
Avoid in severe hepatic impairment if alternatives exist; limited safety data. Watch for nausea (common, dose-related), elevated LFTs, or superinfections. Duration typically ≤14 days.[1][5]
How Providers Make Decisions
Use Child-Pugh score for classification. Consult infectious disease specialists for complex cases like cirrhosis with ascites. Guidelines from IDSA and FDA label emphasize these adjustments.[1][2]
Sources
[1]: FDA Tigecycline Label
[2]: Tygacil Prescribing Information
[3]: Drugs.com Tigecycline Dosing
[4]: PubMed PK Study in Hepatic Impairment
[5]: Lexicomp Tigecycline Monograph