3α,21-Dihydroxy-5β-pregnan-20-on

Agents capable of inducing a total or partial loss of sensation, especially tactile sensation and pain. They may act to induce general ANESTHESIA, in which an unconscious state is achieved, or may act locally to induce numbness or lack of sensation at a targeted site.

Agents that alleviate ANXIETY, tension, and ANXIETY DISORDERS, promote sedation, and have a calming effect without affecting clarity of consciousness or neurologic conditions. ADRENERGIC BETA-ANTAGONISTS are commonly used in the symptomatic treatment of anxiety but are not included here.

Endogenous compounds or drugs that affect neuronal excitability through modulation of specific ionotropic receptors (e.g., GABA-A RECEPTORS). Endogenous neurosteroids are steroid hormones de novo synthesized by neurons and glial cells from steroid metabolite precursors (e.g., PREGNENOLONE).