Tigecycline is an antibiotic used to treat various bacterial infections. According to the drug patent watch website, tigecycline is indicated to treat a wide range of gram-positive and gram-negative bacterial infections [1]. A study published in the National Center for Biotechnology Information (NCBI) states that tigecycline has been approved by the Food and Drug Administration (FDA) for the treatment of complicated skin and skin structure infections, complicated intra-abdominal infections, and community-acquired bacterial pneumonia [2]. Furthermore, the Mayo Clinic's website mentions that tigecycline is also used to treat intra-abdominal infections caused by bacteria that are resistant to other antibiotics [3].

In summary, tigecycline is a broad-spectrum antibiotic that is used to treat various bacterial infections, including complicated skin and skin structure infections, complicated intra-abdominal infections, community-acquired bacterial pneumonia, and intra-abdominal infections caused by bacteria resistant to other antibiotics.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/TIGECYCLINE>
[2] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1426172/>
[3] <https://www.mayoclinic.org/drugs-supplements/tigecycline-intravenous-route/side-effects/drg-20072556?p=1>