Any member of a group of drugs that reversibly inhibit the propagation of signals along nerves. Wide variations in potency, stability, toxicity, water-solubility and duration of action determine the route used for administration, e.g. topical, intravenous, epidural or spinal block.
A drug used for the treatment or prevention of cardiac arrhythmias. Anti-arrhythmia drugs may affect the polarisation-repolarisation phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibres.