Common Liver-Related Side Effects of Tigecycline
Tigecycline, an IV antibiotic for complicated infections, commonly causes elevated liver enzymes. Reported effects include:
- Increased ALT (up to 10% of patients)
- Increased AST (up to 8%)
- Increased alkaline phosphatase (up to 4%)
- Increased bilirubin (up to 2%)
- Hyperbilirubinemia (1-3%)
These are typically mild to moderate and reversible after stopping the drug.[1][2]
Serious Liver Risks and Rare Events
Rare but serious hepatic adverse events occur in <1% of cases:
- Hepatitis
- Hepatic failure
- Jaundice
- Cholestasis
Post-marketing reports note acute liver injury, sometimes fatal, especially in patients with underlying liver disease or concurrent hepatotoxins.[1][3]
How Tigecycline Affects the Liver
It inhibits bacterial protein synthesis but can disrupt mitochondrial function in hepatocytes, leading to enzyme elevations. Risk rises with doses >100mg/day or prolonged use (>14 days).[2][4]
Who Gets Liver Side Effects Most?
Higher incidence in:
- Patients with hepatitis or cirrhosis (monitor closely)
- Those on other liver-stressing drugs (e.g., acetaminophen)
- Elderly or critically ill
Hepatic impairment doesn't require dose adjustment, but baseline LFTs are advised.[1][2]
Monitoring and Management
Check liver function tests before, during (days 3-5), and after therapy. Discontinue if transaminases exceed 5x ULN or symptoms like nausea/fatigue appear.[1][5]
Comparison to Other Antibiotics
Tigecycline has higher hepatotoxicity than tetracyclines like doxycycline (ALT rise <2%) but similar to carbapenems. Avoid in acute hepatic failure unlike safer options like vancomycin.[4][6]
Sources
[1]: Tygacil (tigecycline) Prescribing Information - Pfizer
[2]: Drugs.com - Tigecycline Side Effects
[3]: FDA Adverse Event Reporting System (FAERS) Summary
[4]: Hepatology Journal - Tigecycline Hepatotoxicity Review (2018)
[5]: IDSA Guidelines - Complicated Skin Infections
[6]: Clinical Infectious Diseases - Tetracycline Hepatotoxicity Comparison