How does renal function affect tigecycline dosing?

Standard Tigecycline Dosing

Tigecycline, an IV glycylcycline antibiotic, uses fixed dosing regardless of renal function: 100 mg loading dose, then 50 mg every 12 hours for most infections.[1]

No Adjustments for Renal Impairment

No dose changes are needed in patients with renal impairment, including those on hemodialysis or continuous renal replacement therapy. Tigecycline's pharmacokinetics show minimal renal clearance—less than 20% of the dose is excreted unchanged in urine. Primary elimination occurs via biliary/fecal routes and metabolism.[1][2]

Evidence from Studies

Pharmacokinetic trials confirm stable tigecycline exposure (AUC and Cmax) across creatinine clearance levels from normal (>80 mL/min) to severe (<30 mL/min). A study in end-stage renal disease patients on hemodialysis found no accumulation post-dialysis, as tigecycline is not significantly dialyzable.[2]

Hepatic Impairment Adjustments

Renal function does not alter dosing, but hepatic issues do: reduce maintenance dose to 25 mg every 12 hours in Child-Pugh B/C cirrhosis (after 100 mg load).[1]

Clinical Considerations for Renal Patients

Monitor for superinfections or side effects like nausea, as tigecycline's broad-spectrum activity and fixed dosing apply uniformly. No loading dose adjustment needed even in acute kidney injury.[1][3]

[1]: Tigecycline Prescribing Information (Pfizer)
[2]: Clinical Pharmacology Review - NDA 21-821 (FDA)
[3]: DrugPatentWatch.com - Tigecycline Patent Status