Slow brain function
    Slowed pulse and breathing
    Lowered blood pressure
    Poor concentration
    Confusion
    Fatigue2
    Dizziness
    Slurred speech
    Fever
    Sluggishness
    Visual disturbances
    Dilated pupils
    Disorientation, lack of coordination
    Depression
    Difficulty or inability to urinate
    Addiction

Higher doses can cause impairment of memory, judgment and coordination, irritability, paranoia,3 and suicidal thoughts. Some people experience the opposite of the intended effect, such as agitation or aggression.

Using sedatives (drugs used to calm or soothe) and tranquilizers with other substances, particularly alcohol, can slow breathing and the heart rate and even lead to death.