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Re: Voriconazole, posaconazole, isavuconazole, ravuconazole and albaconazole

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Published: 11 years ago
This is a reply to # 1,559,328

Re: Voriconazole, posaconazole, isavuconazole, ravuconazole and albaconazole

>>Nystatin and oral Amphotericin B aren't absorbed for the blood and they act in the gut.


High-performance liquid chromatographic analysis of amphotericin B in plasma, blood, urine and tissues for pharmacokinetic and tissue distribution studies.

A sensitive and reproducible high-performance liquid chromatographic method was developed to assay ampherotericin B in plasma, blood, urine and various tissue samples. Amphotericin B was isolated from each sample matrix by solid-phase extraction (Bond-Elut). The eluate from Bond-Elut containing amphotericin B was injected onto a reversed-phase C18 column (Waters, mu Bondpak, 10 microns, 300 mm x 3.9 mm I.D.) with a mobile phase of 45% acetonitrile in 2.5 mM Na2EDTA at 1 ml/min. Detection of amphotericin B was by ultraviolet absorption at 382 nm. Blood and tissues were homogenized and extracted with methanol prior to Bond-Elut extraction. The extraction efficiencies of amphotericin B from plasma, blood and tissues were approximately 90, 70 and 75%, respectively.

>>Thse drugs were made to treat the gastrointestinal tract from mouth to anus

You can swallow a keg of Nystatin, and unfortunately not find any in your pretty little anus.

Concentrations of nystatin in faeces after oral administration of various doses of nystatin

Summary Nystatin was administered to ten healthy adult volunteers in increasing doses of 3 ◊ 106 I U, 6 ◊ 106 I U, 9 ◊ 106 I U and 12 ◊ 106 I U per day, each dose being given for a five-day period. Faecal samples were collected daily for the determination of their concentration of biologically active nystatin. Nystatin concentrations were determined biologically; the sensitivity of this method was 20 mcg/g of faeces. During the four treatment periods with increasing doses, 38%, 31%, 26% and 20% respectively of the faecal samples contained biologically undetectable amounts of nystatin. This means that nystatin is either inactivated or unevenly distributed through the intestinal contents, or both. The practical consequences of this may be that in a significant portion of the colon there is no inhibitory nystatin concentration againstCandida albicans, despite treatment with as much as 12 ◊ 106 I U of nystatin per day.


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