|Protein binding||>99.9% |
|Metabolism||Liver, by CYP3A4|
|Biological half-life||5.5 months |
|Synonyms||Bedaquiline fumarate, TMC207, R207910, AIDS222089|
|Chemical and physical data|
|Molar mass||555.5 g/mol|
|3D model (Jmol)|
Bedaquiline, sold under the brand name Sirturo, is a medication used to treat active tuberculosis. It is specifically used to treat multidrug-resistant tuberculosis (MDR-TB) when other treatment cannot be used. It should be used along with at least three other medications for tuberculosis. It is used by mouth.
Common side effects include nausea, joint pains, headaches, and chest pain. Serious side effects include QT prolongation, liver dysfunction, and an increased risk of death. While harm during pregnancy has not been found, it has not been well studied in this population. It is in the diarylquinoline antimycobacterial class of medications. It works by blocking the ability of M. tuberculosis to make adenosine 5'-triphosphate (ATP).
Bedaquiline was approved for medical use in the United States in 2012. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. The cost for six months is approximately $900 USD in low income countries, $3,000 USD in middle income countries, and $30,000 USD in high income countries.
Its use was formally approved (Dec 2012) by the U.S. Food and Drug Administration (FDA) for use in tuberculosis (TB) treatment, as part of a Fast-Track accelerated approval, for use only in cases of multidrug-resistant tuberculosis, and the more resistant extensively drug resistant tuberculosis.
As of 2013[update] Both the World Health Organization (WHO) and US Centers for Disease Control (CDC) have recommended (provisionally) that bedaquiline be reserved for patients with multidrug-resistant tuberculosis when an otherwise recommended regimen cannot be designed.
Bedaquiline has been studied in phase IIb studies for the treatment of multidrug-resistant tuberculosis while phase III studies are currently underway. It has been shown to improve cure rates of smear-positive multidrug-resistant tuberculosis, though with some concern for increased rates of death (further detailed in the Adverse effects section).
The most common side effects of bedaquiline in studies were nausea, joint and chest pain, and headache. The drug also has a black-box warning for increased risk of death and arrhythmias, as it may prolong the QT interval by blocking the hERG channel. All patients on bedaquiline should have monitoring with a baseline and repeated ECGs. If a patient has a QTcF of > 500ms or a significant ventricular arrythmia, bedaquiline and other QT prolonging drugs should be stopped.
There is considerable controversy over the approval for the drug, as one of the largest studies to date had more deaths in the group receiving bedaquiline that those receiving placebo. 10 deaths occurred in the bedaquiline group out of 79, while 2 occurred in the placebo group, out of 81. Of the 10 deaths on bedaquiline, 1 was due to a motor vehicle accident, 5 were judged as due to progression of the underlying tuberculosis and 3 were well after the patient had stopped receiving bedaquiline. However there is still significant concern for the higher mortality in patients treated with bedaquiline, leading to the recommendation to limit its use to situations where a 4 drug regimen cannot otherwise be constructed, limit use with other medications that prolong the QT interval and the placement of a prominent black box warning.
Bedaquiline should not be co-administered with other drugs that are strong inducers or inhibitors of CYP3A4, the hepatic enzyme responsible for oxidative metabolism of the drug. Co-administration with rifampin, a strong CYP3A4 inducer, results in a 52% decrease in the AUC of the drug. This reduces the exposure of the body to the drug and decreases the antibacterial effect. Co-administration with ketoconazole, a strong CYP3A4 inhibitor, results in a 22% increase in the AUC, and potentially an increase in the rate of adverse effects experienced
Since bedaquiline can also prolong the QT interval, use of other QT prolonging drugs should be avoided. Other medications for tuberculosis that can prolong the QT interval include fluoroquinolones and clofazimine.
Mode of action
Bedaquiline blocks the proton pump for ATP synthase of mycobacteria. ATP production is required for cellular energy production and its loss leads to cell death, even in dormant or nonreplicating mycobacteria. It is the first member of a new class of drugs called the diarylquinolines. Bedquiline is bactericidal.
The specific part of ATP synthase affected by bedaquiline is subunit c which is encoded by the gene atpE. Mutations in atpE can lead to resistance. Mutations in drug efflux pumps have also been linked to resistance.
Bedaquiline was described for the first time in 2004 at the Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) meeting, after the drug had been in development for over seven years. It was discovered by a team led by Koen Andries at Janssen Pharmaceutica.
Bedaquiline was approved for medical use in the United States in 2012.
It is manufactured by Johnson & Johnson (J&J), who sought accelerated approval of the drug, a type of temporary approval for diseases lacking other viable treatment options. By gaining approval for a drug that treats a neglected disease, J&J is now able to request expedited FDA review of a future drug.
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- BPaMZ @ TB Alliance
- Two new drug therapies might cure every form of tuberculosis. Feb 2017
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