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Azithromycin

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Azithromycin
Clinical data
Trade namesZithromax, Azithrocin, others[1]
Other names9-deoxy-9α-aza-9α-methyl-9α-homoerythromycin A
AHFS/Drugs.comMonograph
MedlinePlusa697037
License data
Pregnancy
category
  • AU: B1
Routes of
administration		By mouth (capsule, tablet or suspension), intravenous, ophthalmic
Drug classMacrolide
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability38% for 250 mg capsules
MetabolismHepatic
Elimination half-life11–14 h (single dose) 68 h (multiple dosing)
ExcretionBiliary, renal (4.5%)
Identifiers
  • (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-15-oxo- 11-{[3,4,6-trideoxy-3-(dimethylamino)-β-D-xylo-hexopyranosyl]oxy}-1-oxa-6-azacyclopentadec-13-yl 2,6-dideoxy-3C-methyl-3-O-methyl-α-L-ribo-hexopyranoside
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
NIAID ChemDB
CompTox Dashboard (EPA)
ECHA InfoCard100.126.551 Edit this at Wikidata
Chemical and physical data
FormulaC38H72N2O12
Molar mass748.984 g·mol−1 g·mol−1
3D model (JSmol)
  • CN(C)[C@H]3C[C@@H](C)O[C@@H](O[C@@H]2[C@@H](C)[C@H](O[C@H]1C[C@@](C)(OC)[C@@H](O)[C@H](C)O1)[C@@H](C)C(=O)O[C@H](CC)[C@@](C)(O)[C@H](O)[C@@H](C)N(C)C[C@H](C)C[C@@]2(C)O)[C@@H]3O
  • InChI=1S/C38H72N2O12/c1-15-27-38(10,46)31(42)24(6)40(13)19-20(2)17-36(8,45)33(52-35-29(41)26(39(11)12)16-21(3)48-35)22(4)30(23(5)34(44)50-27)51-28-18-37(9,47-14)32(43)25(7)49-28/h20-33,35,41-43,45-46H,15-19H2,1-14H3/t20-,21-,22+,23-,24-,25+,26+,27-,28+,29-,30+,31-,32+,33-,35+,36-,37-,38-/m1/s1 checkY
  • Key:MQTOSJVFKKJCRP-BICOPXKESA-N checkY
  (verify)

Azithromycin is an antibiotic useful for the treatment of a number of bacterial infections.[3] This includes middle ear infections, strep throat, pneumonia, traveler's diarrhea, and certain other intestinal infections.[3] It may also be used for a number of sexually transmitted infections including chlamydia and gonorrhea infections.[3] Along with other medications, it may also be used for malaria.[3] It can be taken by mouth or intravenously with doses once per day.[3]

Common side effects include nausea, vomiting, diarrhea and upset stomach.[3] An allergic reaction or a type of diarrhea caused by Clostridium difficile is possible.[3] No harm has been found with its use during pregnancy.[3] Its safety during breastfeeding is not confirmed, but it is likely safe.[4] Azithromycin is an azalide, a type of macrolide antibiotic.[3] It works by decreasing the production of protein, thus stopping bacterial growth.[3]

Azithromycin was first discovered in 1980.[5] It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.[6] It is available as a generic medication[7] and is sold under many trade names worldwide.[1] The wholesale cost in the developing world is about US$0.18 to US$2.98 per dose.[8] In the United States it is about US$4 for a course of treatment as of 2018.[9]

Medical uses

Azithromycin is used to treat many different infections, including:

  • Prevention and treatment of acute bacterial exacerbations of chronic obstructive pulmonary disease due to H. influenzae, M. catarrhalis, or S. pneumoniae. The benefits of long-term prophylaxis must be weighed on a patient-by-patient basis against the risk of cardiovascular and other adverse effects.[10]
  • Acute bacterial sinusitis due to H. influenzae, M. catarrhalis, or S. pneumoniae. Other agents, such as amoxicillin/clavulanate are generally preferred, however.[11][12]
  • Community-acquired pneumonia due to C. pneumoniae, H. influenzae, M. pneumoniae, or S. pneumoniae[13]
  • Acute otitis media caused by H. influenzae, M. catarrhalis or S. pneumoniae. Azithromycin is not, however, a first-line agent for this condition. Amoxicillin or another beta lactam antibiotic is generally preferred.[14]
  • Pharyngitis or tonsillitis caused by S. pyogenes as an alternative to first-line therapy in individuals who cannot use first-line therapy[15]
  • Uncomplicated skin and skin structure infections due to S. aureus, S. pyogenes, or S. agalactiae
  • Urethritis and cervicitis due to C. trachomatis or N. gonorrhoeae
  • Trachoma due to C. trachomatis[16]
  • Genital ulcer disease (chancroid) in men due to H. ducreyi
  • In combination with ceftriaxone, azithromycin is part of the United States Centers for Disease Control-recommended regimen for the treatment of gonorrhea. Azithromycin is active as monotherapy in most cases, but the combination with ceftriaxone is recommended based on the relatively low barrier to resistance development in gonococci.[17]

Bacterial susceptibility

Azithromycin has relatively broad but shallow antibacterial activity. It inhibits some Gram-positive bacteria, some Gram-negative bacteria, and many atypical bacteria.

A strain of gonorrhea reported to be highly resistant to azithromycin was found in the population in 2015. Neisseria gonorrhoeae is normally susceptible to azithromycin,[18] but the drug is not widely used as monotherapy due to a low barrier to resistance development.[17]Extensive use of azithromycin has resulted in growing Streptococcus pneumoniae resistance.[19]

Aerobic and facultative Gram-positive microorganisms

Aerobic and facultative Gram-negative microorganisms

Anaerobic microorganisms

Other microorganisms

Pregnancy and breastfeeding

No harm has been found with use during pregnancy.[3] However, there are no adequate well-controlled studies in pregnant women.[20]

Safety of the medication during breastfeeding is unclear. It has been reported that because only low levels are found in breastmilk and the medication has also been used in young children, it is unlikely that breastfed infants would suffer adverse effects.[4] Nevertheless, it is recommended that the drug be used with caution during breastfeeding.[3]

Adverse effects

Most common adverse effects are diarrhea (5%), nausea (3%), abdominal pain (3%), and vomiting. Fewer than 1% of people stop taking the drug due to side effects. Nervousness, dermatologic reactions, and anaphylaxis have been reported.[21] As with all antimicrobial agents, pseudomembranous colitis can occur during and up to several weeks after azithromycin therapy. In the past, physicians cautioned women that antibiotics can reduce the effectiveness of oral contraceptives. However, antibiotics, with the exception of rifampin and rifabutin, do not affect the effectiveness of hormonal contraceptives.[22] This change in advice comes because to date, no evidence conclusively demonstrates antibiotics (other than rifampicin or rifabutin) affect these contraceptives.[citation needed] Hearing loss has been reported.[23]

Occasionally, patients have developed cholestatic hepatitis or delirium. Accidental intravenous overdose in an infant caused severe heart block, resulting in residual encephalopathy.[24][25] Clostridium difficile has been reported with use of azithromycin.[3]

In 2013 the FDA issued a warning that azithromycin "can cause abnormal changes in the electrical activity of the heart that may lead to a potentially fatal irregular heart rhythm." The FDA noted in the warning a 2012 study that found the drug may increase the risk of death, especially in those with heart problems, compared with those on other antibiotics such as amoxicillin or no antibiotic. The warning indicated people with preexisting conditions are at particular risk, such as those with QT interval prolongation, low blood levels of potassium or magnesium, a slower than normal heart rate, or those who use certain drugs to treat abnormal heart rhythms.[26][27][28]

Pharmacology

Mechanism of action

Azithromycin prevents bacteria from growing by interfering with their protein synthesis. It binds to the 50S subunit of the bacterial ribosome, thus inhibiting translation of mRNA. Nucleic acid synthesis is not affected.[20]

Pharmacokinetics

Azithromycin is an acid-stable antibiotic, so it can be taken orally with no need of protection from gastric acids. It is readily absorbed, but absorption is greater on an empty stomach. Time to peak concentration (Tmax) in adults is 2.1 to 3.2 hours for oral dosage forms. Due to its high concentration in phagocytes, azithromycin is actively transported to the site of infection. During active phagocytosis, large concentrations are released. The concentration of azithromycin in the tissues can be over 50 times higher than in plasma due to ion trapping and its high lipid solubility.[citation needed] Azithromycin's half-life allows a large single dose to be administered and yet maintain bacteriostatic levels in the infected tissue for several days.[29]

Following a single dose of 500 mg, the apparent terminal elimination half-life of azithromycin is 68 hours.[29] Biliary excretion of azithromycin, predominantly unchanged, is a major route of elimination. Over the course of a week, about 6% of the administered dose appears as unchanged drug in urine.

History

A team of researchers at the pharmaceutical company Pliva—Gabrijela Kobrehel, Gorjana Radobolja-Lazarevski, and Zrinka Tamburašev, led by Dr. Slobodan Đokić—discovered azithromycin in 1980. It was patented in 1981. In 1986, Pliva and Pfizer signed a licensing agreement, which gave Pfizer exclusive rights for the sale of azithromycin in Western Europe and the United States. Pliva put its azithromycin on the market in Central and Eastern Europe under the brand name Sumamed in 1988. Pfizer launched azithromycin under Pliva's license in other markets under the brand name Zithromax in 1991.[30]

Society and culture

Cost

It is available as a generic medication.[7] The wholesale cost is about US$0.18 to US$2.98 per dose.[8] In the United States it is about US$4 for a course of treatment as of 2018.[9] In India it is about US$1.7 for a course of treatment

Available forms

Azithromycin is commonly administered in film-coated tablet, capsule, oral suspension, intravenous injection, granules for suspension in sachet, and ophthalmic solution.[1]

Usage

In 2010, azithromycin was the most prescribed antibiotic for outpatients in the US,[31] whereas in Sweden where outpatient antibiotic use is a third as prevalent, macrolides are only on 3% of prescriptions.[32]

Brands

It is sold under many trade names worldwide and in combinations with cefixime, nimesulide, ambroxol, and with both tinidazole and fluconazole.[1]

Brand name listings

It is sold under many trade names worldwide including 3-Micina, A Sai Qi, Abacten, Abbott, Acex, Acithroc, Actazith, Agitro, Ai Mi Qi, Amixef, Amizin, Amovin, An Mei Qin, Ao Li Ping, Apotex, Lebanon, Aratro, Aruzilina, Arzomicin, Arzomidol, Asizith, Asomin, Astidal, Astro, Athofix, Athxin, Atizor, Atromizin, Avalon, AZ, AZA, Azacid, Azadose, Azalid, Azalide, AzaSite, Azath, Azatril, Azatril, Azax, Azee, Azeecor, Azeeta, Azelide, Azeltin, Azenil, Azeptin, Azerkym, Azi, Aziact, Azibact, Azibactron, Azibay, Azibect, Azibest, Azibiot, Azibiotic, Azicare, Azicin, Azicine, Aziclass, Azicom, Azicure, Azid, Azidose, Azidraw, Azifam, Azifarm, Azifast, Azifine, Azigen, Azigram, Azigreat, Azikare, Azilide, Azilife, Azilip, Azilup, Azimac, Azimax, Azimed, Azimepha, Azimex, Azimit, Azimix, Azimon, Azimore, Azimycin, Azimycine, Azin, Azindamon, Azinew, Azinex, Azinif, Azinil, Azintra, Aziom, Azipar, Aziped, Aziphar, Azipin, Azipro, Aziprome, Aziquilab, Azirace, Aziram, Aziresp, Aziride, Azirol, Azirom, Azirox, Azirute, Azirutec, Aziset, Azisis, Azison, Azissel, Aziswift, Azit, Azita, Azitam, Azitex, Azith, Azithral, Azithrin, Azithro, Azithrobeta, Azithrocin, Azithrocine, Azithromax, Azithromed, Azithromicina, Azithromycin, Azithromycine, Azithromycinum, Azithrovid, Azitic, Azitive, Azitome, Azitrac, Azitral, Azitrax, Azitredil, Azitrex, Azitrim, Azitrin, Azitrix, Azitro, Azitrobac, Azitrocin, Azitroerre, Azitrogal, Azitrolabsa, Azitrolid, Azitrolit, Azitrom, Azitromac, Azitromax, Azitromek, Azitromicin, Azitromicina, Azitromycin, Azitromycine, Azitrona, Azitropharma, Azitroteg, Azitrox, Azitsa, Azitus, Azivar, Azivirus, Aziwill, Aziwok, Azix, Azizox, Azmycin, Azo, Azobat, Azocin, Azoget, Azoheim, Azoksin, Azom, Azomac, Azomax, Azomex, Azomycin, Azomyne, Azores, Azorox, Azostar, Azot, Azoxin, Azras, Azro, Azrocin, Azrolid, Azromax, Azrosin, Aztin, Aztrin, Aztro, Aztrogecin, Azvig, Azycin, Azycyna, Azydrop, Azypin, Azytact, Azytan, Azyter, Azyter, Azyth, Azywell, Azza, Ba Qi, Bactizith, Bactrazol, Bai Ke De Rui, Batif, Bazyt, Bezanin, Bin Qi, Binozyt, BinQi, Biocine, Biozit, Bo Kang, Canbiox, Cetaxim, Charyn, Chen Yu, Cinalid, Cinetrin, Clamelle, Clearsing, Corzi, Cozith, Cronopen, Curazith, Delzosin, Dentazit, Disithrom, Doromax, Doyle, Elzithro, Eniz, Epica, Ethrimax, Ezith, Fabodrox, Fabramicina, Feng Da Qi, Figothrom, Floctil, Flumax, Fu Qi-Hua Yuan, Fu Rui Xin, Fuqixing, Fuxin-Hai Xin Pharm, Geozif, Geozit, Gitro, Goldamycin, Gramac, Gramokil, Hemomicin, Hemomycin, I-Thro, Ilozin, Imexa, Inedol, Infectomycin, Iramicina, Itha, Jin Nuo, Jin Pai Qi, Jinbo, Jun Jie, Jun Wei Qing, Kai Qi, Kang Li Jian, Kang Qi, Katrozax, Ke Lin Da, Ke Yan Li, Koptin, Kuai Yu, L-Thro, Laz, Legar, Lg-Thral, Li Ke Si, Li Li Xing, Li Qi, Lin Bi, Lipuqi, Lipuxin, Lizhu Qile, Loromycin, Lu Jia Kang, Luo Bei Er, Luo Qi, Maazi, Macroazi, Macromax, Macrozit, Maczith, Makromicin, Maxmor, Mazit, Mazitrom, Medimacrol, Meithromax, Mezatrin, Ming Qi Xin, Misultina, Na Qi, Nadymax, Naxocina, Neblic, Nemezid, Neofarmiz, Nifostin, Nobaxin, Nokar, Novatrex, Novozithron, Novozitron, Nurox, Odaz, Odazyth, Onzet, Oranex, Oranex, Ordipha, Orobiotic, Pai Fen, Pai Fu, Paiqi, Pediazith, Portex, Pu He, Pu Le Qi, Pu Yang, Qi Gu Mei, Qi Mai Xing, Qi Nuo, Qi Tai, Qi Xian, Qili, Qiyue, Rarpezit, Razimax, Razithro, Rezan, Ribotrex, Ribozith, Ricilina, Rizcin, Romycin, Rothin (Rakaposhi), Rozalid, Rozith, Ru Shuang Qi, Rui Qi, Rui Qi Lin, Rulide, Sai Jin Sha, Sai Le Xin, Sai Qi, Selimax, Sheng Nuo Ling, Shu Luo Kang, Simpli-3, Sisocin, Sitrox, Sohomac, Stromac, Su Shuang, Sumamed, Sumamox, Tailite, Talcilina, Tanezox, Te Li Xin, Tetris, Texis, Thoraxx, Throin, Thromaxin, Tong Tai Qi Li, Topt, Toraseptol, Tremac, Trex, Tri Azit, Triamid, Tridosil, Trimelin, Tritab, Tromiatlas, Tromix, Trozamil, Trozin, Trozocina, Trulimax, Tuoqi, Udox, Ultreon, Ultreon, Vectocilina, Vinzam, Visag, Vizicin, Wei Li Qinga, Wei Lu De, Wei Zong, Weihong, Xerexomair, Xi Le Xin, Xi Mei, Xin Da Kang, Xin Pu Rui, Xithrone, Ya Rui, Yan Sha, Yanic, Yi Nuo Da, Yi Song, Yi Xina, Yin Pei Kang, Yong Qi, You Ni Ke, Yu Qi, Z-3, Z-PAK, Zady, Zaiqi, Zaret, Zarom, Zathrin, Zedbac, Zeemide, Zenith, Zentavion, Zetamac, Zetamax, Zeto, Zetron, Zevlen, Zibramax, Zicho, Zigilex, Zikti, Zimacrol, Zimax, Zimicina, Zindel, Zinfect, Zirom, Zisrocin, Zistic, Zit-Od, Zitab, Zitax, Zithrax, Zithrin, Zithro-Due, Zithrobest, Zithrodose, Zithrogen, Zithrokan, Zithrolide, Zithromax, Zithrome, Zithromed, Zithroplus, Zithrotel, Zithrox, Zithroxyn, Zithtec, Zitinn, Zitmac, Zitraval, Zitrax, Zitrex, Zitric, Zitrim, Zitrobid, Zitrobiotic,Zithrolect, Zitrocin, Zitrocin, Zitrogram, Zitrolab, Zitromax, Zitroneo, Zitrotek, Ziyoazi, Zmax, Zocin, Zomax, Zotax, Zycin, and Zythrocin.[1]

It is sold as a combination drug with cefixime as Anex-AZ, Azifine-C, Aziter-C, Brutacef-AZ, Cezee, Fixicom-AZ, Emtax-AZ, Olcefone-AZ, Starfix-AZ, Zeph-AZ, Zicin-CX, and Zifi-AZ.[1]

It is also sold as a combination drug with nimesulide as Zitroflam; in a combination with tinidazole and fluconazole as Trivafluc, and in a combination with ambroxol as Zathrin-AX, Laz-AX and Azro-AM.[1]

References

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  2. ^ "FDA-sourced list of all drugs with black box warnings (Use Download Full Results and View Query links.)". nctr-crs.fda.gov. FDA. Retrieved 22 Oct 2023.
  3. ^ a b c d e f g h i j k l m "Azithromycin". The American Society of Health-System Pharmacists. Archived from the original on 2015-09-05. Retrieved Aug 1, 2015. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  4. ^ a b "Azithromycin use while Breastfeeding". Archived from the original on 5 September 2015. Retrieved 4 September 2015. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
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  6. ^ "WHO Model List of Essential Medicines (19th List)" (PDF). World Health Organization. April 2015. Archived from the original (PDF) on 13 December 2016. Retrieved 8 December 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  7. ^ a b Hamilton, Richart (2015). Tarascon Pocket Pharmacopoeia 2015 Deluxe Lab-Coat Edition. Jones & Bartlett Learning. ISBN 9781284057560.
  8. ^ a b "Azithromycin". International Drug Price Indicator Guide. Retrieved 4 September 2015.
  9. ^ a b "NADAC as of 2018-05-23". Centers for Medicare and Medicaid Services. Retrieved 24 May 2018.
  10. ^ Taylor SP, Sellers E, Taylor BT (2015). "Azithromycin for the Prevention of COPD Exacerbations: The Good, Bad, and Ugly". Am. J. Med. 128: 1362.e1-6. doi:10.1016/j.amjmed.2015.07.032. PMID 26291905.
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  15. ^ Randel A (2013). "IDSA Updates Guideline for Managing Group A Streptococcal Pharyngitis". Am Fam Physician. 88 (5): 338–40. PMID 24010402.
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  19. ^ Lippincott Illustrated Reviews : Pharmacology Sixth Edition. p. 506.
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  21. ^ Mori F, Pecorari L, Pantano S, Rossi M, Pucci N, De Martino M, Novembre E (2014). "Azithromycin anaphylaxis in children". Int J Immunopathol Pharmacol. 27 (1): 121–6. doi:10.1177/039463201402700116. PMID 24674687. Retrieved 19 February 2016.
  22. ^ Toh, Sengwee; Mitchell, Allen A.; Anderka, Marlene; de Jong-Van den Berg, Lolkje T.W.; Hernández-Díaz, Sonia; National Birth Defects Prevention Study (2011). "Antibiotics and oral contraceptive failure — a case-crossover study". Contraception. 83 (5): 418–25. doi:10.1016/j.contraception.2010.08.020. PMC 3326585. PMID 21477683.
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  29. ^ a b "Archived copy". Archived from the original on 2014-10-14. Retrieved 2014-10-10. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)CS1 maint: archived copy as title (link)
  30. ^ Banić Tomišić, Z. (2011). "The Story of Azithromycin". Kemija u industriji. 60 (12): 603–617. ISSN 0022-9830. Archived from the original on 2017-09-08. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  31. ^ Hicks, LA; Taylor TH, Jr; Hunkler, RJ (Apr 11, 2013). "U.S. outpatient antibiotic prescribing, 2010". The New England Journal of Medicine. 368 (15): 1461–1462. doi:10.1056/NEJMc1212055. PMID 23574140.
  32. ^ Hicks, LA; Taylor TH, Jr; Hunkler, RJ (Sep 19, 2013). "More on U.S. outpatient antibiotic prescribing, 2010". The New England Journal of Medicine. 369 (12): 1175–1176. doi:10.1056/NEJMc1306863. PMID 24047077.
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