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In Vivo Evaluation of the Absorption and Gastrointestinal Transit of Avitriptan in Fed and Fasted Subjects Using Gamma Scintigraphy

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Abstract

The study was conducted to assess the bioavailability of avitriptan after a standard high fat meal, in relation to gastrointestinal transit. Six healthy male subjects were enrolled in a four-period study with a partial replicate design where each was administered 150-mg avitriptan capsule (i) after an overnight fast, (ii) 5 min after a standard high-fat breakfast, and (iii) 4 hr after a standard high fat breakfast. The treatment administered in Period 3 was repeated in Period 4 to assess intrasubject variations in pharmacokinetics and gastrointestinal (GI) transit. Avitriptan capsules were specially formulated with nonradioactive 152 samarium chloride hexahydrate which was neutron-activated to gamma-emitting 153 samarium before dosing. Serial blood samples were collected for analysis of avitriptan up to 24-hr postdose, and serial scintigraphic images were obtained to assess the plasma concentration–time profile in relation to the GI transit of the avitriptan capsule contents. Bioavailability of avitriptan was reduced when administered in the fed condition but only the decrease in AUC(INF) was statistically significant Tmax was significantly delayed between the fed conditions and the fasted condition. Qualitative appearance of plasma concentration–time profiles for avitriptan could be related to the manner in which the drug emptied from the stomach. It was also apparent that avitriptan exerted a secondary pharmacologic effect that temporarily suspended gastric emptying in the fasted treatment. Thus, when gastric emptying was interrupted and then resumed, the net result was a double peak in some of the individual plasma concentration profiles. Scintigraphic analysis also demonstrated that upon emptying from the stomach, avitriptan was rapidly absorbed from the upper small intestine. In the fed state, gastric emptying was slow and continuous resulting in extended absorption and a lower occurrence of double peaks. Qualitatively, the intrasubject variability in Cmax and AUC could be explained by the intrasubject variability in gastric emptying in both fasted and fed conditions.

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Authors and Affiliations

  1. Department of Metabolism and Pharmacokinetics, Bristol-Myers Squibb Company, P.O. Box 4000, Princeton, New Jersey, 08543-4000

    Punit H. Marathe, Douglas S. Greene & Rashmi H. Barbhaiya

  2. College of Pharmacy, University of Kentucky, Lexington, Kentucky, 40536-0082

    Erik P. Sandefer, Richard C. Page & George A. Digenis

  3. Department of Biostatistics and Data Management, Bristol-Myers Squibb Company, Princeton, New Jersey, 08543

    Georgia E. Kollia

  4. Pharmaceutical Development, Bristol-Myers Squibb Company, Princeton, New Jersey, 08543

    Robert A. Lipper

  5. Scintipharma,Inc., Princeton, Kentucky, 40502

    Walter J. Doll

  6. Department of Radiology, A. B. Chandler Medical Center,Company, Princeton, New Jersey, 40536

    U. Y. Ryo

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  1. Punit H. Marathe
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  2. Erik P. Sandefer
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  3. Georgia E. Kollia
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  4. Douglas S. Greene
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  10. George A. Digenis
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Marathe, P.H., Sandefer, E.P., Kollia, G.E. et al. In Vivo Evaluation of the Absorption and Gastrointestinal Transit of Avitriptan in Fed and Fasted Subjects Using Gamma Scintigraphy. J Pharmacokinet Pharmacodyn 26, 1–20 (1998). https://doi.org/10.1023/A:1023236823320

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