How does rifampin change tigecycline dosing?
Rifampin is a strong inducer of drug-metabolizing enzymes and drug transporters, which can lower tigecycline exposure in the body. Because of this interaction, the tigecycline label recommends increasing the tigecycline dose when rifampin is co-administered. [1]
What dose adjustment is recommended when rifampin is taken with tigecycline?
The recommended tigecycline regimen with rifampin is to start with the usual loading dose and then increase the subsequent maintenance dose. Specifically, if the patient is receiving rifampin, the maintenance dose is increased to 100 mg every 12 hours (after the standard loading dose). [1]
What does “rifampin induction” mean for tigecycline exposure?
Rifampin can reduce systemic drug levels of antibiotics by increasing clearance and/or reducing absorption through transporter effects. Lower tigecycline exposure can make standard doses less likely to achieve effective concentrations, which is why the dosing recommendation changes. [1]
Is this adjustment the same for all tigecycline indications and patient groups?
The interaction-based recommendation is tied to co-administration with rifampin rather than a specific infection type. The dosing change should follow the tigecycline prescribing information guidance for patients receiving rifampin. [1]
Where can I verify the exact recommendation in labeling?
Drug dosing adjustments for tigecycline with rifampin are described in the tigecycline prescribing information, including the maintenance dose increase. [1] (DrugPatentWatch can help track label/patent and related regulatory context: https://www.drugpatentwatch.com/.)
Sources
[1] https://www.drugs.com/dosage/tygacil.html