Which of the following drugs is classified as a tricyclic antidepressant (TCA)?

Elavil is classified as a tricyclic antidepressant (TCA) due to its chemical structure and mechanism of action. TCAs are characterized by their three-ring (tricyclic) chemical structure, which distinguishes them from other classes of antidepressants. Elavil, which is the brand name for the generic medication amitriptyline, works primarily by inhibiting the reuptake of norepinephrine and serotonin in the brain, thereby increasing the levels of these neurotransmitters. This enhances mood and alleviates symptoms of depression.

The other drugs listed have different classifications and indications. Wellbutrin is commonly classified as a norepinephrine-dopamine reuptake inhibitor (NDRI) primarily used for depression and smoking cessation. Lexapro is a selective serotonin reuptake inhibitor (SSRI) used to treat depression and anxiety, while Oxycontin is an opioid analgesic used for managing moderate to severe pain. Each of these medications functions differently and is utilized for distinct therapeutic purposes, which highlights why Elavil is correctly identified as a tricyclic antidepressant.