Mebendazole: Mechanism of Action
Mebendazole is an antiparasitic medication used to treat intestinal worms, tissue parasites, or ectoparasitic infections.
Benzimidazole antiparasitics bind to parasite β-tubulin, disrupting microtubule assembly and blocking intracellular glucose transport.
How It Works
Albendazole and mebendazole are benzimidazole antiparasitic agents that selectively bind to β-tubulin in helminth parasites, preventing polymerisation into microtubules. Disruption of microtubule-dependent processes impairs: intracellular transport of secretory granules, glucose uptake via inhibition of cytoskeletal GLUT anchoring, and mitotic spindle formation. The result is glycogen depletion, inhibition of secretory processes, and parasite death. Selectivity for parasite vs mammalian tubulin is exploited therapeutically. Albendazole sulphoxide (active metabolite) has superior tissue penetration enabling treatment of larval/tissue-stage parasites.
Receptor / Target Profile
- •Parasite β-tubulin — selective high-affinity binding vs mammalian tubulin
- •Glucose transporter complex (indirect) — glucose uptake blocked via cytoskeletal disruption
- •CYP3A4 — metabolises albendazole to active sulphoxide and inactive sulphone forms
Pharmacokinetics
Onset of Action
Intestinal helminths (single dose): egg output halted within 24 hours; parasite expulsion 2–5 days. Tissue stages (echinococcosis): weeks to months of treatment required
Half-Life (t½)
Albendazole sulphoxide (active): 8–12 hours. Mebendazole: 2–9 hours (poorly absorbed; acts largely intraluminally)
Mebendazole: poor oral absorption (<10%) — effective for intestinal helminths via high intraluminal concentration. Albendazole: variable oral absorption, enhanced 5× with fatty meal; extensive first-pass to active sulphoxide; systemic distribution enables treatment of tissue stages. Albendazole sulphoxide penetrates blood-brain barrier (~40% of plasma levels) and hydatid cysts.
Conditions Treated with Mebendazole
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