The principal route of biotransformation involves N-demethylation of the desosamine sugar or at the 9a position on the macrolide ring. Other metabolic pathways include O-demethylation and hydrolysis and/or hydroxylation of the cladinose and desosamine sugar moieties and the macrolide ring. Up to 10 metabolites of azithromycin have been identified, and all are microbiologically inactive. While short-term administration of azithromycin produces hepatic accumulation of the drug and increases azithromycin demethylase activity, current evidence indicates that hepatic cytochrome p450 induction of inactivation via cytochrome-metabolite complex formation does not occur. In contrast to erythromycin, azithromycin does not inhibit its own metabolism via this pathway.
◉ Summary of Use during Lactation:Because of the low levels of azithromycin in breastmilk and use in infants in higher doses, it would not be expected to cause adverse effects in breastfed infants. Monitor the infant for possible effects on the gastrointestinal flora, such as vomiting, diarrhea, candidiasis (thrush, diaper rash). Unconfirmed epidemiologic evidence indicates that the risk of infantile hypertrophic pyloric stenosis might be increased by maternal use of macrolide antibiotics during the first two weeks of breastfeeding, but others have questioned this relationship. In one study, a single dose of azithromycin given during labor to women who were nasal carriers of pathogenic Staphylococcus and Streptococcus reduced the counts of these bacteria in breastmilk, but increased the prevalence of azithromycin-resistant E. coli and K. pneumoniae in breastmilk.
◉ Effects in Breastfed Infants:A cohort study of infants diagnosed with infantile hypertrophic pyloric stenosis found that affected infants were 2.3 to 3 times more likely to have a mother taking a macrolide antibiotic during the 90 days after delivery. Stratification of the infants found the odds ratio to be 10 for female infants and 2 for male infants. All of the mothers of affected infants nursed their infants. Most of the macrolide prescriptions were for erythromycin, but only 7% were for azithromycin. However, the authors did not state which macrolide was taken by the mothers of the affected infants.
A retrospective database study in Denmark of 15 years of data found a 3.5-fold increased risk of infantile hypertrophic pyloric stenosis in the infants of mothers who took a macrolide during the first 13 days postpartum, but not with later exposure. The proportion of infants who were breastfed was not known, but probably high. The proportion of women who took each macrolide was also not reported.
A study comparing the breastfed infants of mothers taking amoxicillin to those taking a macrolide antibiotic found no instances of pyloric stenosis. However, most of the infants exposed to a macrolide in breastmilk were exposed to roxithromycin. Only 10 of the 55 infants exposed to a macrolide were exposed to azithromycin. Adverse reactions occurred in 12.7% of the infants exposed to macrolides which was similar to the rate in amoxicillin-exposed infants. Reactions included rash, diarrhea, loss of appetite, and somnolence.
Eight women who were given azithromycin 500 mg intravenously 15, 30 or 60 minutes prior to incision for cesarean section breastfed their newborn infants. No adverse events were noted in their infants.
Two meta-analyses failed to demonstrate a relationship between maternal macrolide use during breastfeeding and infantile hypertrophic pyloric stenosis.
◉ Effects on Lactation and Breastmilk:In a double-blind, controlled study in Gambia, women who were nasopharyngeal carriers of Staphylococcus aureus, Streptococcus pneumoniae or group B streptococcus were given a single 2 gram dose of azithromycin during labor. Milk samples from women who received azithromycin had 9.6% prevalence of carriage of the organisms compared to 21.9% in women who received placebo. Nasopharyngeal carriage in mothers and infants was also reduced on day 6 postpartum. However, a later analysis found oral intrapartum azithromycin did not reduce carriage of Escherichia coli and Klebsiella pneumoniae and was associated with an increase in the prevalence of azithromycin-resistant E. coli and K. pneumoniae isolates in breastmilk.
Because concomitant use of pimozide and other macrolides (e.g., clarithromycin) has increased pimozide concentrations and is associated with a risk of prolonged QT interval and serious cardiovascular effects, the manufacturer of pimozide states that concomitant use of pimozide and macrolides (including azithromycin) is contraindicated.
Although specific drug interaction studies have not been performed with azithromycin, concomitant use with other macrolides has resulted in increased phenytoin concentrations. Therefore, the patient should be carefully monitored if azithromycin and phenytoin are used concomitantly.
Although the single-dose extended-release oral suspension of azithromycin may be taken without regard to antacids containing magnesium hydroxide and/or aluminum hydroxide, conventional oral azithromycin preparations (tablets or oral suspension) should not be administered simultaneously with aluminum- or magnesium-containing antacids. A study using azithromycin capsules (no longer commercially available) indicate that administration of oral azithromycin 500 mg with an aluminum- and magnesium hydroxide-containing antacid resulted in a decreased rate of absorption of azithromycin as evidenced by 24% reduction in peak serum azithromycin concentrations; however, the extent of azithromycin absorption (AUC) was unaffected.
Although specific drug interaction studies have not been performed with azithromycin, concomitant use with other macrolides has resulted in increased concentrations of ergot alkaloids (ergotamine, dihydroergotamine). Therefore, the patient should be carefully monitored if azithromycin and ergot alkaloids are used concomitantly.
来源:Hazardous Substances Data Bank (HSDB)
吸收、分配和排泄
“胆汁排泄的阿奇霉素,主要是以未改变的药物形式,是口服给药后消除的主要途径。”
Biliary excretion of azithromycin, predominantly as unchanged drug is a major route of elimination following oral administration.
Azithromycin is rapidly absorbed from the GI tract after oral administration; absorption of the drug is incomplete but exceeds that of erythromycin. The absolute oral bioavailability of azithromycin is reported to be approximately 34-52% with single doses of 500 mg to 1.2 g administered as various oral dosage forms. Limited evidence indicates that the low bioavailability of zithromycin results from incomplete GI absorption rather acid degradation of the drug or extensive first-pss metabolism.
Azithromycin appears to be distributed into most body tissues and fluids after oral or IV administration. The extensive tissue uptake of azithromycin has been attributed to cellular uptake of this basic antibiotic into relatively acidic lysosomes as a result of iron trapping and to an energy-dependent pathway associated with the nucleoside transport system.
Because of rapid distribution into tissues and high intracellular concentrations of azithromycin, tissue concentrations of the drug generally exceed plasma concentrations by 10- to 100-fold following single dose administration; with multiple dosing, the tissue-to-plasma ratio increases.
[EN] ISOTHIAZOLOQUINOLONES AND RELATED COMPOUNDS AS ANTI-INFECTIVE AGENTS<br/>[FR] ANTI-INFECTIEUX A BASE D'ISOTHIAZOLOQUINOLONES ET DE SELS CORRESPONDANTS
申请人:ACHILLION PHARMACEUTICALS INC
公开号:WO2005019228A1
公开(公告)日:2005-03-03
The invention provides compounds and salts of Formula (I) and Formula (II): which possess antimicrobial activity. The invention also provides novel synthetic intermediates useful in making compounds of Formula (I) and Formula (II). The variables A1, R2, R3, R5, R6, R7, A8 and R9 are defined herein. Certain compounds of Formula (I) and Formula (II) disclosed herein are potent and selective inhibitors of bacterial DNA synthesis and bacterial replication. The invention also provides antimicrobial compositions, including pharmaceutical compositions, containing one or more compounds of Formula (I) or Formula (II) and one or more carriers, excipients, or diluents. Such compositions may contain a compound of Formula (I) or Formula (II) as the only active agent or may contain a combination of a compound of Formula (I) or Formula (II) and one or more other active agents. The invention also provides methods for treating microbial infections in animals.
The invention provides anti-wall teichoic acid antibodies and antibiotic conjugates thereof, and methods of using the same.
这项发明提供了抗壁母细胞酸抗体及其抗生素结合物,以及使用它们的方法。
8-N-substituted-2H-isothiazolo[5,4-b]quinolizine-3,4-diones and related compounds as antiinfective agents
申请人:Bradbury J. Barton
公开号:US20060173026A1
公开(公告)日:2006-08-03
The invention provides compounds and salts of Formula I and Formula II:
which possess antimicrobial activity. The invention also provides novel synthetic intermediates useful in making compounds of Formula I and Formula II. The variables A
1
, A
8
, R
2
, R
3
, R
5
, R
6
, R
7
, and R
9
are defined herein.
Certain compounds of Formula I and Formula II disclosed herein are potent and selective inhibitors of bacterial DNA synthesis and bacterial replication. The invention also provides antimicrobial compositions, including pharmaceutical compositions, containing one or more compounds of Formula I or Formula II and one or more carriers, excipients, or diluents. Such compositions may contain a compound of Formula I or Formula II as the only active agent or may contain a combination of compounds of Formula I and/or Formula II and one or more other active agents. The invention also provides methods for treating microbial and protozoal infections in animals.
[EN] MODULATION OF IMMUNE RESPONSES BY ADMINISTRATION OF ROXITHROMYCIN OR ITS DERIVATIVE<br/>[FR] MODULATION DES RÉPONSES IMMUNES PAR ADMINISTRATION DE ROXITHROMYCINE OU DE SES DÉRIVÉS
申请人:Y S THERAPEUTICS CO LTD
公开号:WO2009023196A1
公开(公告)日:2009-02-19
Provided are compounds of formula (III) useful for modulation of immune responses, compositions comprising the compounds, and methods of use of such compositions for treating diseases or disorders involving an immune response. In certain embodiments, the compounds are useful for the treatment of diseases or disorders associated with transendothelial migration of T cells and activated T cells, and proinflammatory cytokine production from T cells and macrophages. Diseases or disorders that can be treated include arthritic and rheumatic disorders, such as rheumatoid arthritis.
8A,9-dihydro-4aH-isothiazolo[5,4-b]quinoline-3,4-diones and related compounds as anti-infective agents
申请人:Bradbury J. Barton
公开号:US20060100215A1
公开(公告)日:2006-05-11
The invention provides compounds and salts of Formula I and Formula II:
which possess antimicrobial activity. The invention also provides novel synthetic intermediates useful in making compounds of Formula I and Formula II. The variables n, m, p, R
A
, R
B
, A
1
, R
2
, R
3
, R
5
, R
6
, R
7
, A
8
and R
9
are defined herein.
Certain compounds of Formula I and Formula II disclosed herein are potent and/or selective inhibitors of bacterial DNA synthesis and bacterial replication. The invention also provides antimicrobial compositions, including pharmaceutical compositions, containing one or more compounds of Formula I or Formula II and one or more carriers, excipients, or diluents. Such compositions may contain a compound of Formula I or Formula II as the only active agent or may contain a combination of a compound of Formula I or Formula II and one or more other active agents. The invention also provides methods for treating microbial infections in eukaryotes.