Pyrazinamide is a medication used to treat tuberculosis.[2] For active tuberculosis, it is often used with rifampicin, isoniazid, and either streptomycin or ethambutol.[3] It is not generally recommended for the treatment of latent tuberculosis.[2] It is taken by mouth.[1]
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| Trade names | Rifater, Tebrazid, others[1] |
| AHFS/Drugs.com | Monograph |
| MedlinePlus | a682402 |
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| Routes of administration | By mouth |
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| Pharmacokinetic data | |
| Bioavailability | >90% |
| Metabolism | liver |
| Elimination half-life | 9 to 10 hours |
| Excretion | kidney |
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| ECHA InfoCard | 100.002.470 |
| Chemical and physical data | |
| Formula | C5H5N3O |
| Molar mass | 123.115 g·mol−1 |
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Common side effects include nausea, loss of appetite, muscle and joint pains, and rash.[2][4] More serious side effects include gout, liver toxicity, and sensitivity to sunlight.[2] It is not recommended in those with significant liver disease or porphyria.[3] It is unclear if use during pregnancy is safe but it is likely okay during breastfeeding.[3] Pyrazinamide is in the antimycobacterial class of medications.[2] How it works is not entirely clear.[2]
Pyrazinamide was first made in 1936, but did not come into wide use until 1972.[5] It is on the World Health Organization's List of Essential Medicines.[6] Pyrazinamide is available as a generic medication.[2]
Medical uses
editPyrazinamide is only used in combination with other drugs such as isoniazid and rifampicin in the treatment of Mycobacterium tuberculosis and as directly observed therapy (DOT).[4] It is never used on its own. It has no other indicated medical uses. In particular, it is not used to treat other mycobacteria; Mycobacterium bovis and Mycobacterium leprae are innately resistant to pyrazinamide.
Pyrazinamide is used in the first 2 months of treatment to reduce the duration of treatment required.[7] Regimens not containing pyrazinamide must be taken for 9 months or more.
Pyrazinamide is a potent antiuricosuric drug[8] and consequently has an off-label use in the diagnosis of causes of hypouricemia and hyperuricosuria.[9] It acts on URAT1.[9]
Adverse effects
editThe most common (roughly 1%) side effect of pyrazinamide is joint pains (arthralgia), but this is not usually so severe that patients need to stop taking it.[10][11] Pyrazinamide can precipitate gout flares by decreasing renal excretion of uric acid.[12]
The most dangerous side effect of pyrazinamide is hepatotoxicity, which is dose-related. The old dose for pyrazinamide was 40–70 mg/kg daily and the incidence of drug-induced hepatitis has fallen significantly since the recommended dose has been reduced to 12–30 mg/kg daily. In the standard four-drug regimen (isoniazid, rifampicin, pyrazinamide, ethambutol), pyrazinamide is the most common cause of drug-induced hepatitis.[13] It is not possible to clinically distinguish pyrazinamide-induced hepatitis from hepatitis caused by isoniazid or rifampicin; test dosing is required (this is discussed in detail in tuberculosis treatment)[citation needed]
Other side effects include nausea and vomiting, anorexia, sideroblastic anemia, skin rash, urticaria, pruritus, dysuria, interstitial nephritis, malaise, rarely porphyria, and fever.[citation needed]
Pharmacokinetics
editPyrazinamide is well absorbed orally. It crosses inflamed meninges and is an essential part of the treatment of tuberculous meningitis. It is metabolised by the liver and the metabolic products are excreted by the kidneys.[citation needed]
Pyrazinamide is routinely used in pregnancy in the UK and the rest of the world; the World Health Organization (WHO) recommends its use in pregnancy; and extensive clinical experience shows that it is safe. In the US, pyrazinamide is not used in pregnancy, citing insufficient evidence of safety.[14] Pyrazinamide is removed by haemodialysis, so doses should always be given at the end of a dialysis session.[medical citation needed]
Mechanism of action
editPyrazinamide is a prodrug that stops the growth of M. tuberculosis.[citation needed]
Pyrazinamide diffuses into the granuloma of M. tuberculosis, where the tuberculosis enzyme pyrazinamidase converts pyrazinamide to the active form pyrazinoic acid.[15] Under acidic conditions of pH 5 to 6, the pyrazinoic acid that slowly leaks out converts to the protonated conjugate acid, which is thought to diffuse easily back into the bacilli and accumulate. The net effect is that more pyrazinoic acid accumulates inside the bacillus at acid pH than at neutral pH.[15][16]
Pyrazinoic acid was thought to inhibit the enzyme fatty acid synthase (FAS) I, which is required by the bacterium to synthesize fatty acids[17] although this has been discounted.[18][19] The accumulation of pyrazinoic acid was also suggested to disrupt membrane potential and interfere with energy production, necessary for survival of M. tuberculosis at an acidic site of infection. However, since an acidic environment is not essential for pyrazinamide susceptibility and pyrazinamide treatment does not lead to intrabacterial acidification nor rapid disruption of membrane potential, this model has also been discounted.[20] Pyrazinoic acid was proposed to bind to the ribosomal protein S1 (RpsA) and inhibit trans-translation,[21] but more detailed experiments have shown that it does not have this activity.[22]
The current hypothesis is that pyrazinoic acid blocks synthesis of coenzyme A. Pyrazinoic acid binds weakly to aspartate decarboxylase (PanD), triggering its degradation.[23] This is an unusual mechanism of action in that pyrazinamide does not directly block the action of its _target, but indirectly triggers its destruction.[citation needed]
Resistance
editMutations in the pncA gene of M. tuberculosis, which encodes a pyrazinamidase and converts pyrazinamide to its active form pyrazinoic acid, are responsible for the majority of pyrazinamide resistance in M. tuberculosis strains.[24] A few pyrazinamide-resistant strains with mutations in the rpsA gene have also been identified.[21] However, a direct association between these rpsA mutations and pyrazinamide resistance has not been established. The pyrazinamide-resistant M. tuberculosis strain DHMH444, which harbors a mutation in the carboxy terminal coding region of rpsA, is fully susceptible to pyrazinoic acid and pyrazinamide resistance of this strain was previously associated with decreased pyrazinamidase activity.[25] Further, this strain was found to be susceptible to pyrazinamide in a mouse model of tuberculosis.[26] Thus, current data indicate that rpsA mutations are not likely to be associated with pyrazinamide resistance. Currently, three main methods of testing are used for pyrazinamide resistance: 1) phenotypic tests where a tuberculosis strain is grown in the presence of increasing concentrations of pyrazinamide, 2) measuring levels of pyrazinamidase enzyme produced by the tuberculosis strain, or 3) looking for mutations in the pncA gene of tuberculosis.[15] Concerns exist that the most widely used method for phenotypic resistance testing may overestimate the number of resistant strains.[27][28]
Global resistance of tuberculosis to pyrazinamide has been estimated to be in 16% of all cases,[when?] and 60% of people with multidrug-resistant tuberculosis.[15]
Abbreviations
editThe abbreviations PZA and Z are standard, and used commonly in the medical literature, although best practice discourages the abbreviating of drug names to prevent mistakes.[medical citation needed]
Presentation
editPyrazinamide is a generic drug, and is available in a wide variety of presentations. Pyrazinamide tablets form the bulkiest part of the standard tuberculosis treatment regimen. Pyrazinamide tablets are so large, some people find them impossible to swallow: pyrazinamide syrup is an option.[citation needed]
Pyrazinamide is also available as part of fixed-dose combinations with other TB drugs such as isoniazid and rifampicin (Rifater is an example).[citation needed]
History
editPyrazinamide was first discovered and patented in 1936, but not used against tuberculosis until 1952.[19] Its discovery as an antitubercular agent was remarkable since it has no activity against tuberculosis in vitro, due to not being active at a neutral pH, so would ordinarily not be expected to work in vivo.[29] However, nicotinamide was known to have activity against tuberculosis and pyrazinamide was thought to have a similar effect. Experiments in mice at Lederle and Merck confirmed its ability to kill tuberculosis and it was rapidly used in humans.[29]
References
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- ^ a b c d e f g "Pyrazinamide". The American Society of Health-System Pharmacists. Archived from the original on 20 December 2016. Retrieved 8 December 2016.
- ^ a b c World Health Organization (2009). Stuart MC, Kouimtzi M, Hill SR (eds.). WHO Model Formulary. World Health Organization. pp. 136, 140, 594, 608. hdl:10665/44053. ISBN 978-9241547659.
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- ^ Donald PR, van Helden PD (2011). Antituberculosis Chemotherapy. Karger Medical and Scientific Publishers. p. 8. ISBN 978-3805596282. Archived from the original on 10 September 2017.
- ^ World Health Organization (2019). World Health Organization model list of essential medicines: 21st list. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
- ^ "Controlled trial of four thrice-weekly regimens and a daily regimen all given for 6 months for pulmonary tuberculosis". Lancet. 1 (8213): 171–174. January 1981. doi:10.1016/S0140-6736(02)95623-0. PMID 6109855.
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- ^ a b c d Whitfield MG, Soeters HM, Warren RM, York T, Sampson SL, Streicher EM, et al. (28 July 2015). "A Global Perspective on Pyrazinamide Resistance: Systematic Review and Meta-Analysis". PLOS ONE. 10 (7): e0133869. Bibcode:2015PLoSO..1033869W. doi:10.1371/journal.pone.0133869. PMC 4517823. PMID 26218737.
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- ^ Speirs RJ, Welch JT, Cynamon MH (June 1995). "Activity of n-propyl pyrazinoate against pyrazinamide-resistant Mycobacterium tuberculosis: investigations into mechanism of action of and mechanism of resistance to pyrazinamide". Antimicrobial Agents and Chemotherapy. 39 (6): 1269–1271. doi:10.1128/aac.39.6.1269. PMC 162725. PMID 7574514.
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- ^ Chedore P, Bertucci L, Wolfe J, Sharma M, Jamieson F (January 2010). "Potential for erroneous results indicating resistance when using the Bactec MGIT 960 system for testing susceptibility of Mycobacterium tuberculosis to pyrazinamide". Journal of Clinical Microbiology. 48 (1): 300–301. doi:10.1128/JCM.01775-09. PMC 2812260. PMID 19923479.
- ^ Piersimoni C, Mustazzolu A, Iacobino A, Giannoni F, Santoro G, Gherardi G, et al. (December 2016). "Pyrazinamide susceptibility testing: proposed new standard with the BACTECTM MGITTM 960 system". The International Journal of Tuberculosis and Lung Disease. 20 (12): 1677–1680. doi:10.5588/ijtld.16.0360. PMID 27931346.
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External links
edit- "Pyrazinamide". Drug Information Portal. U.S. National Library of Medicine.
