Macrocyclic lactone anthelmintic / ectoparasiticide
Ivermectin
Positive allosteric modulator of invertebrate glutamate-gated chloride channels, producing paralysis in susceptible parasites. Mammalian GABA/glycine channel effects occur at much higher exposures.
Primary Mechanism of Action
Clinical / Scientific
Ivermectin binds invertebrate glutamate-gated chloride channels (GluCl), increasing Cl− conductance, hyperpolarizing neuromuscular and pharyngeal neurons, and causing flaccid paralysis. Selectivity vs mammals reflects GluCl absence in humans and limited CNS penetration at conventional doses (P-gp). Additional in-vitro effects on importins or signalling proteins are experimental and do not by themselves establish human antiviral efficacy.
Pathway Targets
Glutamate-gated chloride channels
Scientific explanation
Positive modulation causing parasite neuronal hyperpolarization.
GABA-gated chloride channels
Scientific explanation
Lower-affinity host/invertebrate sites; CNS effects are exposure-dependent.
Pathway Convergence
Clinical / Scientific
Target → pathway → downstream effect → biological consequence. This is a mechanistic map, not a treatment claim.
Parasite neuromuscular shutdown
Target to downstream effect: GluCl potentiation → Chloride influx → Hyperpolarization → Pharyngeal and somatic paralysis
Mechanistically Relevant Repurposed & Adjunctive Applications
Onchocerciasis, strongyloidiasis, and labelled ectoparasite uses
EstablishedMechanistic rationale
Established antiparasitic for labelled human and veterinary indications, including some topical dermatologic uses of the cream presentation.
Host signalling / antiviral laboratory effects
PreclinicalMechanistic rationale
In-vitro nuclear-transport and signalling findings are mechanistic observations. They do not constitute proven treatment for viral disease.
Mechanistic Application Matrix
| Biological Target | Mechanism | Potential Relevance | Evidence Level |
|---|---|---|---|
| GluCl channels | Positive allosteric modulation | Invertebrate neuromuscular control | Established mechanism |
| Importin / NS trafficking (models) | Experimental binding | Laboratory antiviral hypotheses | Preclinical |
Mechanistic Interaction Considerations
P-glycoprotein inhibitors and drugs that raise central exposures can increase neurotoxicity risk. GABA-active medicines may theoretically interact at high exposures.
In Plain Language
Ivermectin opens chloride channels that many worms and mites use in their nerves. Extra chloride quiets those nerves so the parasite cannot move or feed. Human nerves are built differently, which is why usual doses are selective — but very high exposures are not.
Research Context
- GluCl mechanism. Macrocyclic lactone action on invertebrate glutamate-gated chloride channels is established anthelmintic pharmacology.
Mechanistic information is provided for scientific and educational purposes. Discussion of biological pathways or investigational applications does not establish clinical efficacy or constitute individualized medical advice.