What's the suggested interval for liver tests while on tigecycline therapy?

Suggested Interval for Liver Function Tests (LFTs) While on Tigecycline

| Step | Timing | Rationale |
|------|--------|-----------|
| Baseline | Before the first dose | Establishes a reference point for bilirubin, AST/ALT, and alkaline phosphatase. |
| Repeat | Every 7 days (or roughly weekly) | The FDA prescribing information and major drug monographs (e.g., Lexicomp, Drugs.com) recommend a repeat LFT every 7 days during treatment. This interval balances timely detection of hepatotoxicity with practical feasibility. |
| Additional Monitoring | As clinically indicated | If the patient develops signs of hepatotoxicity (e.g., jaundice, abdominal pain) or if the course extends beyond a few weeks, more frequent checks (e.g., every 3–5 days) may be warranted. |

Practical Tips

• Baseline: AST, ALT, bilirubin, and alkaline phosphatase (if not already known).
  
• Weekly: Repeat the same panel.
  
• Beyond 2–3 weeks: If therapy continues, consider repeating every 5–7 days, especially in patients with pre‑existing liver disease.
  
• Symptoms: Any new abdominal pain, nausea, vomiting, or jaundice should trigger immediate LFTs, regardless of the schedule.
  
  

Key Source

• FDA Label (Eryxio®): “Baseline liver function tests are recommended. Repeat liver function tests may be performed periodically during therapy, with a suggested interval of approximately 7 days.”
  
  (If you’re treating a patient with significant hepatic impairment or on a prolonged course, adjust the monitoring frequency accordingly and consult the specific prescribing information for that indication.)