See the DrugPatentWatch profile for tigecycline

Based on the information provided, I was unable to find a specific recommendation for how often liver values should be checked when using Tigecycline. However, Tigecycline, like many other antibiotics, is known to have the potential to affect liver function [1].

The prescribing information for Tigecycline, as provided by the drug's manufacturer, includes a warning about the potential for hepatotoxicity and recommends monitoring liver function in patients receiving the drug [2]. The frequency of monitoring, however, is not specified.

It is recommended to follow the guidelines and recommendations of the healthcare provider or institution when it comes to monitoring liver function while on Tigecycline or any other medication. They will take into account the patient's overall health, the duration of treatment, and other factors when determining the appropriate monitoring schedule.

In general, it is important to regularly check liver function when using drugs that have the potential to affect liver function. This can help to detect any potential liver damage early and take appropriate action.

Sources:

[1] DrugPatentWatch.com "Tigecycline" <https://www.drugpatentwatch.com/drugs/tigecycline>

[2] Pfizer. "Tygacil (tigecycline) Prescribing Information." Pfizer, October 2018, <https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/021877s031lbl.pdf>