Standard Dosing for Tigecycline
Tigecycline (Tygacil) is administered intravenously for complicated skin/skin structure infections, complicated intra-abdominal infections, and community-acquired bacterial pneumonia in adults. The typical regimen starts with a 100 mg loading dose, followed by 50 mg every 12 hours. Infuse over 30-60 minutes to minimize vein irritation.[1]
How to Prepare and Administer Tigecycline
Reconstitute each 50 mg vial with 5.3 mL sterile water or 0.9% sodium chloride (yielding 10 mg/mL). Further dilute in 100 mL compatible IV fluid (e.g., normal saline, lactated Ringer's) to a final concentration of 0.5-1 mg/mL. Use immediately after reconstitution; stable for up to 6 hours at room temperature or 24 hours refrigerated. Avoid rapid injection or IV push.[1]
Compatibility and Infusion Precautions
Compatible with PVC bags but incompatible with solutions containing calcium (e.g., Ringer's lactate with calcium), magnesium, or bicarbonate—risk of precipitate formation. Do not co-administer with other drugs through the same line. Monitor for infusion-related reactions like nausea or phlebitis.[1]
Adjustments for Kidney or Liver Impairment
No dose adjustment needed for renal impairment, including hemodialysis (95% fecal elimination). For severe hepatic impairment (Child-Pugh C), reduce maintenance dose to 25 mg every 12 hours after 100 mg load.[1]
Why Tigecycline Needs Slow Infusion
Rapid infusion increases risks of nausea, vomiting, and injection-site pain due to its tetracycline-like structure irritating tissues. Guidelines emphasize 30-60 minute infusions to improve tolerability.[1][2]
Common Administration Errors and Risks
Over-dilution or incompatible fluids can cause particulates leading to embolism. Pediatric use (8+ years, ≥45 kg) follows adult dosing but lacks full safety data. Pregnancy category D—avoid due to fetal bone growth risks.[1]
[1] Tygacil Prescribing Information (Pfizer)
[2] FDA Label and Guidelines