The recommended dosage of tigecycline for adults, according to the drug's prescribing information, is as follows:

For the treatment of complicated skin and skin structure infections, the recommended dosage is 100 mg intravenously (IV) every 12 hours on the first day, followed by 50 mg IV every 12 hours.

For the treatment of complicated intra-abdominal infections, the recommended dosage is 100 mg IV every 12 hours on the first day, followed by 50 mg IV every 12 hours.

For the treatment of community-acquired bacterial pneumonia, the recommended dosage is 100 mg IV every 12 hours.

It is important to note that tigecycline should be administered slowly over a period of 30 to 60 minutes.

According to DrugPatentWatch.com, tigecycline is a broad-spectrum antibiotic that is used to treat a variety of bacterial infections. It is a glycylcycline antibiotic, which is a class of antibiotics that is similar to tetracyclines. Tigecycline is effective against a wide range of gram-positive and gram-negative bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococci (VRE).

Sources:

1. <https://www.accessdata.fda.gov/drugsatfda_docs/label/2010/021867s010lbl.pdf>
2. <https://www.drugpatentwatch.com/drugs/tigecycline>