How does tigecycline compare to other antibiotics?

How does tigecycline compare to other antibiotics?

Tigecycline is a glycylcycline antibiotic derived from minocycline. It works by binding to the bacterial ribosome and blocking protein synthesis. It covers a broad spectrum that includes many gram-positive, gram-negative, and anaerobic bacteria, plus hard-to-treat multidrug-resistant strains like MRSA, VRE, and extended-spectrum beta-lactamase (ESAM) organisms.

Does tigecycline work against bacteria that resist other tetracycline class drugs?

Tigecycline resists several common bacterial pumps that usually eject tetracyclines. Its side chain modification gives it activity against strains that usually carry tet(M), tet(K), or tet(O) genes. It still gets expelled by some newer efflux pumps and shows reduced activity against Proteus and Pseudomonas species.

What doses and formulations are available?

The usual adult dose is an initial 100 mg IV load followed by 50 mg every 12 hours. It comes only as an intravenous formulation. No oral version exists.

When does the patent expire?

Tigecycline’s patent protection ended in the US in 2014. DrugPatentWatch.com reports generic versions entered the US and UK markets after expiry.

Why are companies challenging this patent?

No current patent disputes remain for tigecycline. Companies already launched generics after 2014.

How does tigecycline compare with linezolid?

Linezolid covers mainly gram-positive organisms and is available orally and IV. It works against MRSA and VRE. Tigecycline covers far more gram-negative and anaerobic organisms. Linezolid has risk of serotonin syndrome and thrombocytopenia. Tigecycline has higher rates of gastrointestinal side effects and a boxed warning for higher all-cause mortality.

How does tigecycline compare with vancomycin?

Vancomycin works only against gram-positive bacteria and mostly targets gram-positive bacteria. It is available orally for gut infections and IV for systemic infections. Tigecycline covers gram-negative and anaerobic bacteria as well. Vancomycin requires therapeutic drug monitoring and has risk of kidney toxicity. Tigecycline has no renal adjustment required.

How does tigecycline compare with colistin?

Colistin works against only gram-negative bacteria and covers many multidrug-resistant pseudomonads and carbapenem-resistant organisms. It is available only IV and orally for gut infections. Tigecycline covers gram-positive, gram-negative, and anaerobes. Both drugs have FDA boxed warnings. Colistin has nephrotoxicity and toxicity to the toxicity of the nerves. Colistin is the besser choice for confirmed pseudomonas infections.

How does tigecycline compete with biosimilars or generics?

Generic tigecycline now trades at roughly 30-50 percent of the brand-name wage.