Tell your doctor if your condition persists or worsens (such as your feelings of sadness get worse, or you have thoughts of suicide). Do not increase your dose or use this drug more often or for longer than prescribed. Limit your time in the sun. This medication belongs to a class of medications called tricyclic antidepressants. Older adults may be more sensitive to the side effects of this drug, especially dry mouth, dizziness, drowsiness, confusion, difficulty urinating and QT prolongation (see above). This medication belongs to a class of medications called tricyclic antidepressants.