Comparative effects of velnacrine, tacrine and physostigmine on the twitch responses in the rat phrenic-hemidiaphragm preparation

Fèlix Bosch, Miguel Morales, Albert Badia, Josep Eladi Baños

    Research output: Contribution to journalArticleResearchpeer-review

    3 Citations (Scopus)

    Abstract

    1. Cholinesterase inhibitors potentiated twitch responses induced by nerve stimulation, with physostigmine more potent than tacrine and velnacrine. However, at higher concentrations, tacrine decreased twitch responses in a concentration-dependent manner. 2. Tacrine strongly depressed directly-induced twitch responses, whereas the other drugs had minimal effects. 3. Physostigmine was the most potent drug in reversal of tubocurarine-induced blockade, but its antagonism index was similar to those obtained with tacrine and velnacrine at higher concentrations. When evaluating their ability to reverse neomycin-induced blockade, all drugs exhibited a similar effect. 4. It is concluded that tacrine and velnacrine are less potent than physostigmine in potentiating skeletal neuromuscular transmission. Additionally, the blocking effects of tacrine could limit its therapeutic efficacy. © 1993.
    Original languageEnglish
    Pages (from-to)1101-1105
    JournalGeneral Pharmacology
    Volume24
    DOIs
    Publication statusPublished - 1 Jan 1993

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