ISSN:
1573-904X
Keywords:
dihydroergotamine
;
ergot alkaloids
;
intranasal delivery
;
pharmacokinetics
;
rat
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Intranasal dosing of dihydroergotamine (DHE) allows convenient self-administration and provides an alternate route of administration for the treatment of migraine in addition to the existing parenteral dosage forms. In this study, the pharmacokinetics of 3H-DHE were investigated following intravenous and intranasal dosing (0.343 mg DHE/animal) in the rat. Intranasal administration of DHE resulted in rapid absorption. The extent of absorption of the radiolabeled dose was approximately 45%–60%. Absolute bioavailability of the parent drug was 35%–40%, as determined by deconvolution and by the ratios of AUC0−∞ following intranasal and intravenous dosing. Due to the limited capacity of the nostrils, approximately half of the intranasal dose was swallowed into the gastrointestinal tract. Biliary excretion was found to be the predominant pathway of radioactivity excretion following both routes of administration. The results from this study suggest that intranasal administration provides a viable means of delivering DHE into the systemic circulation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1018937132434
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