Which medication belongs to the category of tricyclic antidepressants?

Doxepin is classified as a tricyclic antidepressant (TCA). TCAs are a group of medications primarily used to treat depression and various anxiety disorders. They work by influencing neurotransmitters in the brain, specifically norepinephrine and serotonin, which are key chemicals that help regulate mood. Doxepin, in particular, is also prescribed for insomnia and certain types of chronic pain due to its sedative effects.

The other medications listed fall into different categories: Quinidine is an antiarrhythmic medication used primarily to treat irregular heartbeats, Haldol (haloperidol) is an antipsychotic used for conditions such as schizophrenia and acute psychosis, and Amiodarone is another antiarrhythmic drug primarily used to manage and prevent serious heart rhythm problems. None of these are classified as antidepressants, illustrating the distinct role of Doxepin within its category.