Sedative-Hypnotics: Barbiturates and Benzodiazepines Lecture Notes

Overview of Sedative-Hypnotics and Anxiolytics

• Sedative-hypnotics and anxiolytics: A diverse group of compounds that depress the central nervous system (CNS) and behavior.
    - Major classes include:
      - Alcohol
      - Barbiturates
      - Non-barbiturate hypnotics
      - Anxiolytics (tranquilizers)

• Examples of drugs in these categories include:
    - Barbiturates:
      - Tuinal
      - Sodium Amytal
      - Medomin
      - Amytal
      - Phanodorm
      - Nembutal
      - Sodium Seconal
      - Soneryl
      - Epanutin

Dose-Dependent Effects of Sedative-Hypnotics

• Effects may vary with increasing dose:
    - Alertness
    - Relief from anxiety
    - Sedation
    - Sleep
    - Decreasing consciousness
    - General anesthesia
    - Coma
    - Death

Barbiturates

Historical Context

• Discovered by Adolf von Baeyer (1864), who created barbituric acid—the foundation of all barbiturates.

• Marketed drugs:
    - Barbital (1903)
    - Phenobarbital (1912)

• Utilized as sedatives, anticonvulsants, and anesthetics with high prevalence.

Pharmacokinetics

• All barbiturates exhibit similar effects but differ in speed and duration of action.

• Factors influencing pharmacokinetics include:
    - High lipid solubility leads to rapid brain penetration.
    - Redistribution to body fat stores results in a brief duration of effect.

Abuse and Effects

• Barbiturate use is associated with effects similar to alcohol:
    - Relief of anxiety, loss of inhibitions, and a