definition of Tofranil (imipramine hydrochloride): Tofranil® is a tricyclic antidepressant that is usually prescribed for depression, and for childhood enuresis (bed-wetting). One possible serious side effect is increased risk of suicidal thinking and behavior in children, adolescents, and young adults. The risk of this side effect needs to be weighed carefully with the clinical need. Families should be aware of the need for close observation of the child or adolescent taking this medication, and maintain communication with the doctor who prescribed it.