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'''Erythromycin''' is an [[macrolide]] [[antibiotic]] useful for the treatment of a number of [[bacterial infection]]s.<ref name=AHFS2015/> This includes [[respiratory tract infections]], [[skin infections]], [[chlamydia infections]], and [[syphilis]].<!-- <ref name=AHFS2015/> --> It may also be used during [[pregnancy]] to prevent [[Group B streptococcal infection]] in the newborn.<ref name=AHFS2015/> Erythromycin may be used to improve [[gastroparesis|delayed stomach emptying]].<ref>{{cite journal|last1=Camilleri|first1=M|last2=Parkman|first2=HP|last3=Shafi|first3=MA|last4=Abell|first4=TL|last5=Gerson|first5=L|last6=American College of|first6=Gastroenterology|title=Clinical guideline: management of gastroparesis.|journal=The American journal of gastroenterology|date=January 2013|volume=108|issue=1|pages=18-37; quiz 38|pmid=23147521}}</ref> It can be given intravenously and by mouth.<ref name=AHFS2015/> An eye ointment is routinely recommended after delivery to prevent [[neonatal conjunctivitis|eye infections in the newborn]].<ref>{{cite journal|last1=Matejcek|first1=A|last2=Goldman|first2=RD|title=Treatment and prevention of ophthalmia neonatorum.|journal=Canadian family physician Medecin de famille canadien|date=November 2013|volume=59|issue=11|pages=1187-90|pmid=24235191}}</ref>
'''Erythromycin''' is an [[antibiotic]] useful for the treatment of a number of [[bacterial infection]]s.<ref name=AHFS2015/> This includes [[respiratory tract infections]], [[skin infections]], [[chlamydia infections]], and [[syphilis]].<!-- <ref name=AHFS2015/> --> It may also be used during [[pregnancy]] to prevent [[Group B streptococcal infection]] in the newborn.<ref name=AHFS2015/> Erythromycin may be used to improve [[gastroparesis|delayed stomach emptying]].<ref>{{cite journal|last1=Camilleri|first1=M|last2=Parkman|first2=HP|last3=Shafi|first3=MA|last4=Abell|first4=TL|last5=Gerson|first5=L|last6=American College of|first6=Gastroenterology|title=Clinical guideline: management of gastroparesis.|journal=The American journal of gastroenterology|date=January 2013|volume=108|issue=1|pages=18-37; quiz 38|pmid=23147521}}</ref> It can be given intravenously and by mouth.<ref name=AHFS2015/> An eye ointment is routinely recommended after delivery to prevent [[neonatal conjunctivitis|eye infections in the newborn]].<ref>{{cite journal|last1=Matejcek|first1=A|last2=Goldman|first2=RD|title=Treatment and prevention of ophthalmia neonatorum.|journal=Canadian family physician Medecin de famille canadien|date=November 2013|volume=59|issue=11|pages=1187-90|pmid=24235191}}</ref>


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<!-- Side effects and mechanism -->

Revision as of 20:10, 21 September 2015

"Eryc" redirects here. For the local authority of the East Riding of Yorkshire, see East Riding of Yorkshire Council.
Erythromycin
Clinical data
Trade namesEryc, Erythrocin, others[1]
AHFS/Drugs.comMonograph
MedlinePlusa682381
Pregnancy
category
Routes of
administration		oral, iv, im, topical, eye drops
ATC code
Legal status
Legal status
  • AU: S4 (Prescription only)
  • UK: POM (Prescription only)
  • US: ℞-only
Pharmacokinetic data
BioavailabilityDepends on the ester type between 30% - 65%
Protein binding90%
Metabolismliver (under 5% excreted unchanged)
Elimination half-life1.5 hours
Excretionbile
Identifiers
  • (3R,4S,5S,6R,7R,9R,11R,12R,13S,14R)-6-
    {[(2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy}-
    14-ethyl-7,12,13-trihydroxy-4-{[(2R,4R,5S,6S)-
    5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy}-
    3,5,7,9,11,13-hexamethyl-1-oxacyclotetradecane-2,10-dione
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.003.673 Edit this at Wikidata
Chemical and physical data
FormulaC37H67NO13
Molar mass733.93 g/mol g·mol−1
3D model (JSmol)
  • CC[C@@H]1[C@@]([C@@H]([C@H](C(=O)[C@@H](C[C@@]([C@@H]([C@H]([C@@H]([C@H](C(=O)O1)C)O[C@H]2C[C@@]([C@H]([C@@H](O2)C)O)(C)OC)C)O[C@H]3[C@@H]([C@H](C[C@H](O3)C)N(C)C)O)(C)O)C)C)O)(C)O
  • InChI=1S/C37H67NO13/c1-14-25-37(10,45)30(41)20(4)27(39)18(2)16-35(8,44)32(51-34-28(40)24(38(11)12)15-19(3)47-34)21(5)29(22(6)33(43)49-25)50-26-17-36(9,46-13)31(42)23(7)48-26/h18-26,28-32,34,40-42,44-45H,14-17H2,1-13H3/t18-,19-,20+,21+,22-,23+,24+,25-,26+,28-,29+,30-,31+,32-,34+,35-,36-,37-/m1/s1 checkY
  • Key:ULGZDMOVFRHVEP-RWJQBGPGSA-N checkY
  (verify)

Erythromycin is an antibiotic useful for the treatment of a number of bacterial infections.[1] This includes respiratory tract infections, skin infections, chlamydia infections, and syphilis. It may also be used during pregnancy to prevent Group B streptococcal infection in the newborn.[1] Erythromycin may be used to improve delayed stomach emptying.[3] It can be given intravenously and by mouth.[1] An eye ointment is routinely recommended after delivery to prevent eye infections in the newborn.[4]

Common side effects include abdominal cramps, vomiting, and diarrhea. More serious side effects may include Clostridium difficile colitis, liver problems, prolonged QT, and allergic reactions. It is generally safe in those who are allergic to penicillin.[1] Erythromycin also appears to be safe to use during pregnancy and breastfeeding.[2][5] It is in the macrolide family and works by decreasing the making of protein by bacteria.[1]

Erythromycin was first isolated in 1952.[6] It is on the World Health Organization's List of Essential Medicines, the most important medications needed in a basic health system.[7] It is avaliable as a generic medication and is not very expensive.[5] The wholesale price is between 0.03 and 0.06 USD per pill.[8] Erythromycin is produced from the bacteria strain Saccharopolyspora erythraea.[1]

Medical uses

Erythromycin can be used to treat bacteria responsible for causing infections of the skin and upper respiratory tract, including Streptococcus, Staphylococcus, and Haemophilus genera. The following represents MIC susceptibility data for a few medically significant bacteria:[9]

  • Haemophilus influenzae: 0.015 to 256 μg/ml
  • Staphylococcus aureus: 0.023 to 1024 μg/ml
  • Streptococcus pyogenes: 0.004 to 256 μg/ml

Adverse effects

Gastrointestinal disturbances, such as diarrhea, nausea, abdominal pain, and vomiting, are very common because erythromycin is a motilin agonist.[10] Because of this, erythromycin tends not to be prescribed as a first-line drug. However, it may be useful in treating gastroparesis due to this promotility effect. Intravenous erythromycin may also be used in endoscopy as an adjunct to clear gastric contents.

More serious side effects include arrhythmia with prolonged QT intervals including torsades de pointes, and reversible deafness. Allergic reactions range from urticaria to anaphylaxis. Cholestasis, Stevens–Johnson syndrome, and toxic epidermal necrolysis are some other rare side effects that may occur.

Studies have shown evidence both for and against the association of pyloric stenosis and exposure to erythromycin prenatally and postnatally.[11][12] Exposure to erythromycin (especially long courses at antimicrobial doses, and also through breastfeeding) has been linked to an increased probability of pyloric stenosis in young infants.[13][14] Erythromycin used for feeding intolerance in young infants has not been associated with hypertrophic pyloric stenosis.[13]

Erythromycin estolate has been associated with reversible hepatotoxicity in pregnant women in the form of elevated serum glutamic-oxaloacetic transaminase and is not recommended during pregnancy. Some evidence suggests similar hepatotoxicity in other populations.[15]

It can also affect the central nervous system, causing psychotic reactions, nightmares and night sweats.[16]

It may also alter the effectiveness of combined oral contraceptive pills because of its effect on the gut flora. Erythromycin is an inhibitor of the cytochrome P450 system, which means it can have a rapid effect on levels of other drugs metabolised by this system, e.g., warfarin.

Interactions

Erythromycin is metabolized by enzymes of the cytochrome P450 system, in particular, by isozymes of the CYP3A superfamily, CYP3A.[17] The activity of the CYP3A enzymes can be induced or inhibited by certain drugs (e.g. dexamethasone) which can cause it to affect the metabolism of many different drugs, e.g. erythromycin. If other CYP3A substrates — drugs that are broken down by CYP3A — such as simvastatin (Zocor), lovastatin (Mevacor), or atorvastatin (Lipitor)—are taken concomitantly with erythromycin, levels of the substrates increase, often causing adverse effects. A noted drug interaction involves erythromycin and simvastatin, resulting in increased simvastatin levels and the potential for rhabdomyolysis. Another group of CYP3A4 substrates are drugs used for migraine such as ergotamine and dihydroergotamine; their adverse effects may be more pronounced if erythromycin is associated.[16] Earlier case reports on sudden death prompted a study on a large cohort that confirmed a link between erythromycin, ventricular tachycardia, and sudden cardiac death in patients also taking drugs that prolong the metabolism of erythromycin (like verapamil or diltiazem) by interfering with CYP3A4.[18] Hence, erythromycin should not be administered to people using these drugs, or drugs that also prolong the QT interval. Other examples include terfenadine (Seldane, Seldane-D), astemizole (Hismanal), cisapride (Propulsid, withdrawn in many countries for prolonging the QT time) and pimozide (Orap). Theophylline, which is used mostly in asthma, is also contraindicated.

Erythromycin may affect neuromuscular transmission by acting presynaptically, so may produce or worsen symptoms of myasthenia gravis in patients with pre-existing postsynaptic defects. Exacerbations of myasthenia gravis have also been reported with the use of telithromycin and azithromycin.[19]

Erythromycin is not recommended when using clindamycin-containing products, even topical products such as Duac or BenzaClin. In general, the simultaneous use of two different erythromycin derivatives (such as clindamycin and Mitemcinal) should be avoided as drugs in this macrolide family possess a common mechanism of action.

Erythromycin and Doxycycline can have a synergistic effect when combined and kill bacteria (E. coli) with a higher potency than the sum of the two drugs together. However, this synergistic relationship is only temporary. After approximately 72 hours, the relationship shifts to become antagonistic, whereby a 50/50 combination of the two drugs kills less bacteria than if the two drugs were administered separately. [20]

Mechanism of action

Erythromycin displays bacteriostatic activity or inhibits growth of bacteria, especially at higher concentrations,[21] but the mechanism is not fully understood. By binding to the 50s subunit of the bacterial 70s rRNA complex, protein synthesis and subsequent structure and function processes critical for life or replication are inhibited.[21] Erythromycin interferes with aminoacyl translocation, preventing the transfer of the tRNA bound at the A site of the rRNA complex to the P site of the rRNA complex. Without this translocation, the A site remains occupied, thus the addition of an incoming tRNA and its attached amino acid to the nascent polypeptide chain is inhibited. This interferes with the production of functionally useful proteins, which is the basis of this antimicrobial action.

Pharmacokinetics

Erythromycin is easily inactivated by gastric acid; therefore, all orally administered formulations are given as either enteric-coated or more-stable salts or esters, such as erythromycin ethylsuccinate. Erythromycin is very rapidly absorbed, and diffuses into most tissues and phagocytes. Due to the high concentration in phagocytes, erythromycin is actively transported to the site of infection, where, during active phagocytosis, large concentrations of erythromycin are released.[citation needed]

Metabolism

Most of erythromycin is metabolised by demethylation in the liver by the hepatic enzyme CYP3A4. Its main elimination route is in the bile with little renal excretion, 2%-15% unchanged drug. Erythromycin's elimination half-life ranges between 1.5 and 2.0 hours and is between 5 and 6 hours in patients with end-stage renal disease. Erythromycin levels peak in the serum 4 hours after dosing; ethylsuccinate peaks 0.5-2.5 hours after dosing, but can be delayed if digested with food.[22]

Erythromycin crosses the placenta and enters breast milk. The American Association of Pediatrics determined erythromycin is safe to take while breastfeeding.[23] Absorption in pregnant patients has been shown to be variable, frequently resulting in levels lower than in nonpregnant patients.[22]

History

Dr. Abelardo B. Aguilar, a Filipino scientist, sent some soil samples to his employer Eli Lilly in 1949. Eli Lilly’s research team, led by J. M. McGuire, managed to isolate erythromycin from the metabolic products of a strain of Streptomyces erythreus (designation changed to "Saccharopolyspora erythraea") found in the samples.

Lilly filed for patent protection of the compound and U.S. patent 2,653,899 was granted in 1953. The product was launched commercially in 1952 under the brand name Ilosone (after the Philippine region of Iloilo where it was originally collected). Erythromycin was formerly also called Ilotycin.

In 1981, Nobel laureate (1965 in chemistry) and professor of chemistry at Harvard University (Cambridge, MA) Robert B. Woodward (posthumously), along with a large number of members from his research group, reported the first stereocontrolled asymmetric chemical synthesis of erythromycin A.

The antibiotic clarithromycin was invented by scientists at the Japanese drug company Taisho Pharmaceutical in the 1970s as a result of their efforts to overcome the acid instability of erythromycin.

Scientists at Chugai Pharmaceuticals discovered an erythromycin-derived motilin agonist called mitemcinal that is believed to have strong prokinetic properties (similar to erythromycin) but lacking antibiotic properties. Erythromycin is commonly used off-label for gastric motility indications such as gastroparesis. If mitemcinal can be shown to be an effective a prokinetic agent, it would represent a significant advance in the gastrointestinal field, as treatment with this drug would not carry the risk of unintentional selection for antibiotic-resistant bacteria.

Society and culture

Cost

It is avaliable as a generic medication and is not very expensive.[5] The wholesale price is between 0.03 and 0.06 USD per pill.[8]

Synthesis

Over the three decades after the discovery of erythromycin A and its activity as an antimicrobial, many attempts were made to synthesize it in the laboratory. However, the presence of 10 stereospecific carbons and several points of distinct substitution has made the total synthesis of erythromycin A a formidable task.[24] Complete syntheses of erythromycins’ related structures and precursors such as 6-deoxyerythronolide B have been accomplished, giving way to possible syntheses of different erythromycins and other macrolide antimicrobials.[25] However, Woodward did successfully complete the synthesis of erythromycin A.[26][27][28] This total synthesis begins with (7) and (8). After being coupled, the resulting structure is subjected to a series of reactions, including hydrolysis and stereospecific aldolization. The resulting pure enone is then converted to the desired (9) through a series of reduction and oxidation reactions. The dithiadecalin product (9) is then converted to both a ketone (10) and an aldehyde (11).

Available forms

Enteric-coated erythomycin capsule from Abbott Labs

Erythromycin is available in enteric-coated tablets, slow-release capsules, oral suspensions, ophthalmic solutions, ointments, gels, Enteric-coated Capsules Non Enteric-coated tablets Non Enteric-coated capsules and injections. The following erythromycin combinations are available for oral dosage:[29]

  • erythromycin base (capsules, tablets)
  • erythromycin estolate (capsules, oral suspension, tablets), contraindicated during pregnancy[30]
  • erythromycin ethylsuccinate (oral suspension, tablets)
  • erythromycin stearate (oral suspension, tablets)

For injection the available combinations are:[29]

  • erythromycin gluceptate
  • erythromycin lactobionate

Brand names include Robimycin, E-Mycin, E.E.S. Granules, E.E.S.-200, E.E.S.-400, E.E.S.-400 Filmtab, Erymax, Ery-Tab, Eryc, Ranbaxy, Erypar, EryPed, Eryped 200, Eryped 400, Erythrocin Stearate Filmtab, Erythrocot, E-Base, Erythroped, Ilosone, MY-E, Pediamycin, Zineryt, Abboticin, Abboticin-ES, Erycin, PCE Dispertab, Stiemycine, Acnasol, and Tiloryth.

Composition

Standard-grade erythromycin is primarily composed of four related compounds known as erythromycins A, B, C, and D. Each of these compounds can be present in varying amounts and can differ by lot. Erythromycin A has been found to have the most antibacterial activity, followed by erythromycin B. Erythromycins C and D are about half as active as erythromycin A.[31][32] Some of these related compounds have been purified and can be studied and researched individually.

Erythromycin-derived compounds

References

  1. ^ a b c d e f g h "Erythromycin". The American Society of Health-System Pharmacists. Retrieved Aug 1, 2015.
  2. ^ a b "Prescribing medicines in pregnancy database". Australian Government. 23 Aug 2015.
  3. ^ Camilleri, M; Parkman, HP; Shafi, MA; Abell, TL; Gerson, L; American College of, Gastroenterology (January 2013). "Clinical guideline: management of gastroparesis". The American journal of gastroenterology. 108 (1): 18–37, quiz 38. PMID 23147521.
  4. ^ Matejcek, A; Goldman, RD (November 2013). "Treatment and prevention of ophthalmia neonatorum". Canadian family physician Medecin de famille canadien. 59 (11): 1187–90. PMID 24235191.
  5. ^ a b c Hamilton, Richard J. (2013). Tarascon pocket pharmacopoeia (2013 delux lab-coat ed., 14th ed. ed.). [Sudbury, Mass.]: Jones & Bartlett Learning. p. 72. ISBN 9781449673611. {{cite book}}: |edition= has extra text (help)
  6. ^ Vederas, J. C. (2000). Biosynthesis : polyketides and vitamins. Berlin [u.a.]: Springer. p. 52. ISBN 9783540669692.
  7. ^ "WHO Model List of Essential Medicines" (PDF). World Health Organization. October 2013. Retrieved 22 April 2014.
  8. ^ a b "Erythromycin". International Drug Price Indicator Guide. Retrieved 23 August 2015.
  9. ^ http://www.toku-e.com/Assets/MIC/Erythromycin.pdf
  10. ^ Weber FH Jr; et al. (April 1993). "Erythromycin: a motilin agonist and gastrointestinal prokinetic agent". American Journal of Gastroenterology. 88 (4): 485–90. PMID 8470625. {{cite journal}}: Explicit use of et al. in: |author= (help)
  11. ^ http://online.lexi.com/lco/action/doc/retrieve/docid/patch_f/1831759#f_pregnancy-and-lactation
  12. ^ http://online.lexi.com/lco/action/doc/retrieve/docid/74/304361
  13. ^ a b Maheshwai N (March 2007). "Are young infants treated with erythromycin at risk for developing hypertrophic pyloric stenosis?". Arch. Dis. Child. 92 (3): 271–3. doi:10.1136/adc.2006.110007. PMC 2083424. PMID 17337692.
  14. ^ http://www.bmj.com/content/348/bmj.g1908
  15. ^ McCormack WM, George H, Donner A, Kodgis LF, Albert S, Lowe EW, Kass EH (1997). "Hepatotoxicity of erythromycin estoate during pregnancy". Antimicrob Agents Chemother. 12 (5): 630–5. doi:10.1128/AAC.12.5.630. PMC 429989. PMID 21610.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  16. ^ a b Erythromycin. Belgian Center for Pharmacotherapeutical Information. Retrieved July 20, 2008.
  17. ^ (Hunt et al., 1992).
  18. ^ Ray WA, Murray KT, Meredith S, Narasimhulu SS, Hall K, Stein CM. Oral Erythromycin and the Risk of Sudden Death from Cardiac Causes. N Engl J Med 2004;351:1089-96.
  19. ^ http://ispub.com/IJN/10/2/9809
  20. ^ Pena-Miller A, P, H, Beardmore R., R; Laehnemann, D; Jansen, G; Fuentes-Hernandez, A; Rosenstiel, P; Schulenburg, H; Beardmore, R (April 23, 2013). "When the most potent combination of antibiotics selects for the greatest bacterial load: the smile-frown transition". PLOS Biology. 4 (11): e1001540. PMID 23630452. {{cite journal}}: |access-date= requires |url= (help)CS1 maint: multiple names: authors list (link)
  21. ^ a b Katzung PHARMACOLOGY, 9e Section VIII. Chemotherapeutic Drugs Chapter 44. Chloramphenicol, Tetracyclines, Macrolides, Clindamycin, & Streptogramins
  22. ^ a b http://online.lexi.com/lco/action/doc/retrieve/docid/74/304361#pkm
  23. ^ http://www.breastfeedingmadesimple.com/AAPDrugsinMilk.pdf
  24. ^ Pal S (2006). "A journey across the sequential development of macrolides and ketolides related to erythromycin". Tetrahedron. 62 (14): 3171–3200. doi:10.1016/j.tet.2005.11.064.
  25. ^ Evans D. A., Kim A. S. (1997). "Synthesis of 6-Deoxyerythronolide B. Implementation of a General Strategy for the Synthesis of Macrolide Antibiotics". Tetrahedron Lett. 38: 53–56. doi:10.1016/S0040-4039(96)02258-7.
  26. ^ Woodward R. B., Logusch E., Nambiar K. P., Sakan K., Ward D. E., Au-Yeung , Balaram P., Browne L. J., Card P. J.; et al. (1981). "Asymmetric Total Synthesis of Erythromycin. 1. Synthesis of an Erythronolide A Seco Acid Derivative via Asymmetric Induction". J. Am. Chem. Soc. 103 (11): 3210–3213. doi:10.1021/ja00401a049.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  27. ^ Woodward R. B., Logusch E., Nambiar K. P., Sakan K., Ward D. E., Au-Yeung , Balaram P., Browne L. J., Card P. J.; et al. (1981). "Asymmetric Total Synthesis of Erythromycin. 2. Synthesis of an Erythronolide A Lactone System". J. Am. Chem. Soc. 103 (11): 3213–3215. doi:10.1021/ja00401a050.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  28. ^ Woodward R. B., Logusch E., Nambiar K. P., Sakan K., Ward D. E., Au-Yeung , Balaram P., Browne L. J., Card P. J.; et al. (1981). "Asymmetric Total Synthesis of Erythromycin. 3. Total Synthesis of Erythromycin". J. Am. Chem. Soc. 103 (11): 3215–3217. doi:10.1021/ja00401a051.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  29. ^ a b drugs.com > erythromycin (Oral route, Parenteral route) Retrieved on Jan 11, 2010
  30. ^ Sexually Transmitted Diseases Treatment Guidelines 2006 Centers for Disease Control and Prevention. MMWR 2006;55
  31. ^ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC176346/
  32. ^ http://www.toku-e.com/Assets/MIC/Erythromycin%20A%20EvoPure.pdf
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