Item |
Information |
Drug Groups
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approved; investigational |
Description
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Zolmitriptan is a synthetic tryptamine derivative and appears as a white powder that is readily soluble in water. [Wikipedia] |
Indication |
For the acute treatment of adult migraine with or without auras. |
Pharmacology |
Zolmitriptan is a selective agonist of serotonin (5-hydroxytryptamine; 5-HT) type 1B and 1D receptors. It is structurally and pharmacologically related to other selective 5-HT1B/1D receptor agonists, and has only a weak affinity for 5-HT1A, 5-HT5A, and 5-HT7 receptors and no significant affinity or pharmacological activity at 5-HT2, 5-HT3 or 5-HT4 receptor subtypes or at alpha1-, alpha2-, or beta-adrenergic, dopamine1,; dopamine2; muscarinic, or benzodiazepine receptors. This action in humans correlates with the relief of migraine headache. In addition to causing vasoconstriction, experimental data from animal studies show that Zolmitriptan also activates 5-HT1 receptors on peripheral terminals of the trigeminal nerve innervating cranial blood vessels, which may also contribute to the antimigrainous effect of Zolmitriptan in humans. |
Affected Organisms |
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Humans and other mammals |
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Biotransformation |
Hepatic. There have been three metabolites identified: indole acetic acid, N -oxide, and N-desmethyl metabolites. However, the N-desmethyl is the only active metabolite. |
Absorption |
Mean absolute oral bioavailability is approximately 40%. Food has no affect on the rate and extent of absorption. |
Half Life |
The mean elimination half-life of zolmitriptan and of the active N-desmethyl metabolite is 3 hours. |
Protein Binding |
25% |
Distribution |
* 8.4±3.3 L/kg |
Clearance |
* 25.9 mL/min/kg |
References |
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Pascual J: [Mechanism of action of zolmitriptan] Neurologia. 1998 Oct;13 Suppl 2:9-15.
[Pubmed]
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Martin GR: Pre-clinical pharmacology of zolmitriptan (Zomig; formerly 311C90), a centrally and peripherally acting 5HT1B/1D agonist for migraine. Cephalalgia. 1997 Oct;17 Suppl 18:4-14.
[Pubmed]
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External Links |
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