Barbiturates and benzodiazepines are prescription central nervous system depressants. Phenobarbital, amobarbital (Amytal) and secobarbital (Seconal) are examples of barbiturates. Benzodiazepines include tranquilizers such as diazepam (Valium), alprazolam (Xanax), lorazepam (Ativan), clonazepam (Klonopin) and chlordiazepoxide (Librium).

Signs of use and dependence can include:

  • Drowsiness
  • Slurred speech
  • Lack of coordination
  • Memory impairment
  • Confusion
  • Slowed breathing and decreased blood pressure
  • Dizziness
  • Depression