What condition does Imipramine primarily treat?

Imipramine is primarily used to treat major depressive disorder. It belongs to a class of medications known as tricyclic antidepressants (TCAs), which work by influencing the levels of neurotransmitters in the brain, specifically norepinephrine and serotonin. This action enhances mood and alleviates feelings of depression.

While Imipramine can have some secondary applications, such as being effective in treating certain types of anxiety disorders (which may relate to the first option) or being used off-label for chronic pain management, its main indication is for major depressive disorder. Schizophrenia, listed as another option, is primarily treated with antipsychotic medications rather than antidepressants like Imipramine. Thus, its primary use and effectiveness in treating major depressive disorder make this answer the most accurate.