Metabolic inactivation of the macrolides is usually extensive, but the relative proportion depends on the route of administration and th particular antibiotic. ... /Macrolides/
Macrolide antibiotics probably should not be used with chloramphenicol or the lincosamides because they may compete for the same 50 S ribosomal binding site, although the in vivo significance of this potential interaction is unclear. Activity of macrolides is depressed in acidic environments. Macrolide preparations for parenteral administration are incompatible with many other pharmaceutical preparations. ... /Macrolides/
... /The ability to/ Induce phase III migrating myoelectric complex (MMC) activity in dogs and increase smooth muscle contractility ... is shared to varying extents by some macrolide antibiotics, including oleandomycin ... /Motilin: macrolides and erythromycin/
The combination effect of tetracycline (TC) and oleandomycin (OM) on acute infection of mice with four strains of Staphylococcus aureus including TC or OM resistant ones was examined by the quantitative determination of protective potencies of single and combined drugs. The grade of synergism was expressed by the synergistic ratio (SR), a ratio of experimentally determined potency of the combined drug over a hypothetical potency in which additive effect of the both drugs is assumed. With 3 out of the 4 strains of S. aureus synergism between TC and OM or triacetyloleandomycin (TAO) was demonstrated by the determination of the 50% effective dose and by statistical examination of the SR. The grade of synergistic protection by these drugs varied with the strains infected and it did not depend upon the sensitivity to antibiotics or grade of synergism in vitro. There was no synergistic enhancement of acute toxic action in the combined administration of TC and OM to mice.
/SRP:/ Basic treatment: Establish a patent airway (oropharyngeal or nasopharyngeal airway, if needed). Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if needed. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary ... . Monitor for shock and treat if necessary ... . Anticipate seizures and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with 0.9% saline (NS) during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . Cover skin burns with dry sterile dressings after decontamination ... . /Poisons A and B/
来源:Hazardous Substances Data Bank (HSDB)
毒理性
解毒与急救
/SRP:/ 高级治疗:对于昏迷、严重肺水肿或严重呼吸困难的病人,考虑进行口咽或鼻咽气管插管以控制气道。使用气囊面罩装置的正压通气技术可能有益。考虑使用药物治疗肺水肿...。对于严重的支气管痉挛,考虑给予β激动剂,如沙丁胺醇...。监测心率和必要时治疗心律失常...。开始静脉输注5%葡萄糖水(D5W)/SRP: "保持开放",最低流量/。如果出现低血容量的迹象,使用0.9%盐水(NS)或乳酸林格液。对于伴有低血容量迹象的低血压,谨慎给予液体。注意液体过载的迹象...。使用地西泮或劳拉西泮治疗癫痫...。使用丙美卡因氢氯化物协助眼部冲洗...。/Poisons A and B/
/SRP:/ Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious, has severe pulmonary edema, or is in severe respiratory distress. Positive-pressure ventilation techniques with a bag valve mask device may be beneficial. Consider drug therapy for pulmonary edema ... . Consider administering a beta agonist such as albuterol for severe bronchospasm ... . Monitor cardiac rhythm and treat arrhythmias as necessary ... . Start IV administration of D5W /SRP: "To keep open", minimal flow rate/. Use 0.9% saline (NS) or lactated Ringer's if signs of hypovolemia are present. For hypotension with signs of hypovolemia, administer fluid cautiously. Watch for signs of fluid overload ... . Treat seizures with diazepam or lorazepam ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Poisons A and B/
Macrolides become widely distributed in tissues, and concentrations are about the same as in plasma, or even higher in some instances. They actually accumulate within many cells, including macrophages, in which they may be > or = 20 times the plasma concentration. This accumulation accounts in part for the long dosing interval that characterizes some macrolides (eg, tilmicosin). ... Macrolides tend to concentrate in the spleen, liver, kidneys, and particularly the lungs. They enter pleural and ascitic fluids but not the CSF (only 2-13% of plasma concentration unless the meninges are inflamed). They concentrate in the bile and milk. Up to 75% of the dose is bound to plasma proteins, and they bind to alpha1-acid glycoproteins rather than to albumin. /Macrolides/
Macrolides are readily absorbed from the GI tract if not inactivated by gastric acid. ... Plasma levels peak within 1-2 hours in most cases, although absorption patterns may be erratic due to the presence of food and may depend on the salt or ester used. Absorption from the ruminoreticulum is usualy delayed and is unreliable. /Macrolides/
Macrolide antibiotics and their metabolites are excreted mainly in the bile (> 60%) and often undergo enterohepatic cycling. Urinary clearance may be slow and variable (often <10%) but my represent a more significant route of elimination after parenteral administration. The concentration of macrolides in milk often is several times greater than in plasma, especially in mastitis. /Macrolide/
The pharmacokinetics of oleandomycin (OLD) after intravenous and oral administration, both alone and after intramuscular pretreatment with metamizole or dexamethasone, were studied in healthy dogs. After intravenous injection of oleandomycin alone (10 mg/kg as bolus), the elimination half-life (t 1/2 beta, volume of distribution (Vd, area), body clearance (ClB) and area under the concentration time curve (AUC) were 1.60 hr, 1.11 L/kg. 7.36 (ml/kg)/min and 21.66 ug hr/ml, respectively. There were no statistically significant differences following pretreatment with metamizole or dexamethasone. After oral administration of oleandomycin alone, the t 1/2 beta, maximum plasma concentrations (Cmax), time of Cmax (tmax), mean absorption time and absolute bioavailability (Fabs) were 1.6 hr, 5.34 ug/ml, 1.5 hr, 1.34 hr and 84.29%, respectively. Pretreatment with metamizole caused a significantly decreased value for Cmax (2.93 ug/ml) but the mean absorption time value (2.23 hr) was significantly increased. Statistically significant changes in the pharmacokinetic parameters of oleandomycin following oral administration were also observed as a result of pretreatment with dexamethasone. The Cmax was increased (8.24 ug/ml) and the tmax (0.5 hr) and mean absorption time (0.45 hr) were lower.
Knowledge of the disposition of macrolides in a single animal species has been insufficient for the prediction of the pharmacokinetics of macrolides in humans. To better understand the species differences in the pharmacokinetics of macrolide antibiotics, the disposition of erythromycin, oleandomycin, and tylosin in several mammalian species was examined. Generally, the serum concentration versus time profiles of these drugs after intravenous administration were described by two-compartment kinetic models and were similar within each species. These drugs were rapidly cleared, resulting in terminal half-lives of less than 2 h. Comparison of their pharmacokinetics showed greater variation in antibiotic disposition among animal species than noted for the differences within a species. When the pharmacokinetic data was fitted to an allometric model, the logarithms of volume of distribution, clearance, and half-life were linearly related to the logarithms of body weight. From these relationships, the human pharmacokinetics of erythromycin and oleandomycin were extrapolated and found to approximate observed human pharmacokinetics.