Reported Adverse Effects from Tigecycline Overdose
Tigecycline, an intravenous glycylcycline antibiotic, has limited documented cases of overdose due to its hospital-only administration. In clinical trials and post-marketing reports, overdoses up to 216 mg (double the maximum recommended dose) showed no specific toxic effects beyond those seen at standard doses, such as nausea, vomiting, diarrhea, and abdominal pain.[1][2]
Symptoms in Overdose Cases
Known overdose incidents (doses 100-200 mg) primarily mirror common side effects:
- Gastrointestinal: Nausea (up to 26% at standard doses, higher risk in overdose), vomiting, diarrhea.
- Other: Headache, dizziness, elevated liver enzymes (ALT/AST), possible pancreatitis (rare, linked to high exposure).[1][3]
No deaths or life-threatening events directly attributed to tigecycline overdose in available data. Symptoms are generally reversible with supportive care.[2]
Management of Overdose
No specific antidote exists. Treatment is supportive:
- Discontinue drug immediately.
- Monitor vital signs, liver/kidney function, and electrolytes.
- Hemodialysis removes negligible amounts (<10%), but may help for concurrent issues.[1][4]
Consult poison control; gastric lavage or activated charcoal not typically useful due to IV route.
Why Overdose Risks Are Low but Present
Tigecycline's wide therapeutic index (from animal studies) limits acute toxicity, but prolonged high exposure risks accumulation, especially in liver/kidney impairment. Pancreatitis reports stem from elevated serum levels.[3] Vulnerable patients: elderly, those with hepatic dysfunction.
Comparison to Standard Dosing Side Effects
Overdose effects overlap standard ones (nausea in 20-30%, vomiting 15-20%), but intensity may increase. Serious risks like superinfection (C. difficile) or hepatotoxicity emerge more with excess.[1][2]
[1]: Tygacil (tigecycline) Prescribing Information - Pfizer
[2]: FDA Adverse Event Reporting System (FAERS) Summary for Tigecycline
[3]: PubMed: Tigecycline Overdose Case Reports
[4]: Lexicomp: Tigecycline Monograph