Azithromycin

Azithromycin, sold under the brand names Zithromax (in oral form) and Azasite (as an eye drop), is an antibiotic medication used for the treatment of a number of bacterial infections.[4] This includes middle ear infections, strep throat, pneumonia, traveler's diarrhea, and certain other intestinal infections.[4] Along with other medications, it may also be used for malaria.[4] It can be taken by mouth or intravenously.[4]

Not to be confused with Erythromycin.

Azithromycin
Clinical data
Trade namesZithromax, Azithrocin, Sumamed, others[1]
Other names9-deoxy-9α-aza-9α-methyl-9α-homoerythromycin A
AHFS/Drugs.comMonograph
MedlinePlusa697037
License data
Pregnancy
category
Routes of
administration		By mouth (capsule, tablet or suspension), intravenous, eye drop
Drug classMacrolide antibiotic
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability38% for 250 mg capsules
MetabolismLiver
Elimination half-life11–14 h (small doses) 68 h (large or multiple dosing)
ExcretionBile duct, kidney (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
Chemical and physical data
FormulaC38H72N2O12
Molar mass748.996 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
  GLAH&page2=Azithromycin (verify)

Common side effects include nausea, vomiting, diarrhea and upset stomach.[4] An allergic reaction, such as anaphylaxis, QT prolongation, or a type of diarrhea caused by Clostridium difficile is possible.[4] No harm has been found with its use during pregnancy.[4] Its safety during breastfeeding is not confirmed, but it is likely safe.[5] Azithromycin is an azalide, a type of macrolide antibiotic.[4] It works by decreasing the production of protein, thereby stopping bacterial growth.[4][6]

Azithromycin was discovered in 1980 by the Croatian pharmaceutical company Pliva and approved for medical use under the brand name Sumamed in 1988.[7][8] It is on the World Health Organization's List of Essential Medicines.[9] The World Health Organization classifies it as critically important for human medicine.[10] It is available as a generic medication[11] and is sold under many trade names worldwide.[1] In 2020, it was the 68th most commonly prescribed medication in the United States, with more than 10 million prescriptions.[12][13]

Medical uses

Azithromycin is used to treat diverse infections, including:

  • Acute bacterial sinusitis due to H. influenzae, M. catarrhalis, or S. pneumoniae. Other agents, such as amoxicillin/clavulanate are generally preferred, however.[14][15]
  • 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.[16]
  • Community-acquired pneumonia due to C. pneumoniae, H. influenzae, M. pneumoniae, or S. pneumoniae[17]
  • Genital ulcer disease (chancroid) in men due to H. ducreyi
  • Pharyngitis or tonsillitis caused by S. pyogenes as an alternative to first-line therapy in individuals who cannot use first-line therapy[18]
  • 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.[19]
  • Trachoma due to C. trachomatis[20]
  • Uncomplicated skin infections due to S. aureus, S. pyogenes, or S. agalactiae
  • Urethritis and cervicitis due to C. trachomatis or N. gonorrhoeae. 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 and due to frequent co-infection with C. trachomatis and N. gonorrhoeae.[21]
Sumamed 500 mg

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,[22] but the drug is not widely used as monotherapy due to a low barrier to resistance development.[21] Extensive use of azithromycin has resulted in growing Streptococcus pneumoniae resistance.[23]

Aerobic and facultative Gram-positive microorganisms

Aerobic and facultative anaerobic Gram-negative microorganisms

Anaerobic microorganisms

Other microorganisms

Pregnancy and breastfeeding

No harm has been found with use during pregnancy.[4] However, there are no adequate well-controlled studies in pregnant women.[24]

The safety of the medication during breastfeeding is unclear. It was reported that because only low levels are found in breast milk and the medication has also been used in young children, it is unlikely that breastfed infants would have adverse effects.[5] Nevertheless, it is recommended that the drug be used with caution during breastfeeding.[4]

Airway diseases

Azithromycin appears to be effective in the treatment of chronic obstructive pulmonary disease through its suppression of inflammatory processes.[25] And potentially useful in asthma and sinusitis via this mechanism.[26] Azithromycin is believed to produce its effects through suppressing certain immune responses that may contribute to inflammation of the airways.[27][28]

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, skin reactions, and anaphylaxis have been reported.[29] Clostridium difficile infection has been reported with use of azithromycin.[4] Azithromycin does not affect the efficacy of birth control unlike some other antibiotics such as rifampin. Hearing loss has been reported.[30]

Occasionally, people have developed cholestatic hepatitis or delirium. Accidental intravenous overdose in an infant caused severe heart block, resulting in residual encephalopathy.[31][32]

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.[33][34][35]

It has been reported that azithromycin blocks autophagy and may predispose cystic fibrosis patients to mycobacterial infection.[36]

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.[24]

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. Azithromycin's half-life allows a large single dose to be administered and yet maintain bacteriostatic levels in the infected tissue for several days.[37]

Following a single dose of 500 mg, the apparent terminal elimination half-life of azithromycin is 68 hours.[37] 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 an unchanged drug in urine.

History

A team of researchers at the pharmaceutical company Pliva in Zagreb, Croatia,—Gabrijela Kobrehel, Gorjana Radobolja-Lazarevski, and Zrinka Tamburašev, led by Slobodan Đokić—discovered azithromycin in 1980.[38] The company Pliva patented it in 1981.[8] 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.[39] Patent protection ended in 2005.[40]

Society and culture
Zithromax (azithromycin) 250 mg tablets (CA)

Available forms

Azithromycin is available as a generic medication. 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,[41] whereas in Sweden, where outpatient antibiotic use is a third as prevalent, macrolides are only on 3% of prescriptions.[42] In 2017, azithromycin was the second most prescribed antibiotic for outpatients in the United States.[43]

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]

Research

Azithromycin is researched for its supposed anti-inflammatory and immunomodulatory properties, which are believed to be exhibited through its suppression of proinflammatory cytokines and enhancing the production of anti-inflammatory cytokines, which is important in dampening inflammation. Cytokines are small proteins that are secreted by immune cells and play a key role in the immune response. Studies suggest that azithromycin can decrease the release of pro-inflammatory cytokines such as TNF-alpha, IL-1β, IL-6, and IL-8 while increasing the levels of anti-inflammatory cytokine IL-10. By decreasing the number of pro-inflammatory cytokines, azithromycin probably controls potential tissue damage during inflammation. These effects are believed to be due to azithromycin's ability to suppress a transcription factor called nuclear factor-kappa B (NF-κB) resulting in blockade of inflammatory response pathways downstream from NF-κB activation leading to decreased chemokine receptor CXCR4 signaling causing reduced inflammation.[44][45][46][47][48] Despite the efficiency of treating rosacea with azithromycin, the exact mechanism of why azithromycin is effective in treating rosacea are not completely understood.[49] It is unclear whether its antibacterial or immunomodulatory properties or a combination of both mechanisms contribute to its efficacy. Azithromycin may prevent mast cell degranulation and thus can suppress inflammation of dorsal root ganglia through various signaling pathways such as decreased numbers of CD4+ T cells which are particularly relevant since they mediate the response of hair follicle antigens.[50] Inflammation in rosacea is thought to be associated with increased production of reactive oxygen species (ROS) by inflammatory cells. The ability of azithromycin to decrease ROS production can help reduce oxidative stress and inflammation, but this remains speculation.[49]

The therapeutic role of azithromycin has been explored in various diseases such as cystic fibrosis exacerbation, burn injury-induced lung injury, asthma, chronic obstructive pulmonary disease, and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in COVID-19 infection.[51][52][53][54][55] Despite early evidence showing azithromycin slowed down coronavirus multiplication in laboratory settings, further research indicates it to be ineffective as a treatment for COVID-19 in humans.[56] After a large-scale trial showed no benefit of using azithromycin in treating COVID-19, the UK's National Institute for Health and Care Excellence (NICE) updated its guidance and no longer recommends the medication for COVID-19.[57]

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