人口服后约可吸收口服量的30%~58%,单剂口服本品1g后,血药峰浓度(Cmax)为3.9mg/L, 6小时尚有2.1mg/L,进食后土霉素的吸收比空腹服用时约降低一半。本品吸收后广泛分布于肝、肾、肺等组织和体液,易渗入胸水、腹水,不易透过血-脊液脑屏障。本品表观分布容积(Vd)为0.9~1.9L/kg,蛋白结合率为20%~35%,肾功能正常者血消除半衰期(t1/2?)为6~10小时,无尿患者可达47~66小时。盐酸土霉素主要自肾小球滤过排出,给药后24小时内排出给药量的70%,其不吸收部分以原形药随粪便排泄。血液透析约可清除给药量的10%~15%。盐酸土霉素可溶性粉主治:| HSV-1
| Bacterial
| Human Endogenous Metabolite
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Oxytetracycline is an important member of the bacterial aromatic polyketide family, which is a structurally diverse class of natural products. Oxytetracycline is synthesized by a type II polyketide synthase that generates the poly-beta-ketone backbone through successive decarboxylative condensation of malonyl-CoA extender units, followed by modifications by cyclases, oxygenases, transferases, and additional tailoring enzymes.
The effects of administration a therapeutic dose of Oxytetracycline (82.8 mg/kg of bw to 1 % bw/day) for 10 days are species specific. Oxytetracycline increases the relative liver weight in Morone chrysops x M. saxatilis , the enzymatic activity of CYP3A4 in Ictalurus punctatus, protein expression of CYP3A4 in Oreochromis niloticus and depleted the hepatic CYP3A4 in the latter.
For Oxytetracycline, the limits are 100 μg/kg in muscle and milk, 200 μg/kg in egg, 300 μg/kg in liver and 600 μg/kg in kidney. Oxytetracycline (OTC) is administered to fish as medicated feed at concentrations ranging from 35 to 75 mg a.i kg-1 biomass day-1 for 7-14 days.