Which of the following is used primarily to treat depression?

Antidepressants are specifically designed to manage and alleviate the symptoms of depression. They work by adjusting the balance of certain chemicals in the brain, known as neurotransmitters, which are believed to influence mood and emotional responses. By increasing levels of these neurotransmitters, such as serotonin and norepinephrine, antidepressants help improve mood, reduce feelings of sadness, and enhance overall emotional well-being.

The other options serve different medical purposes. Antihypertensives are primarily used for managing high blood pressure, anticonvulsants are prescribed for seizure disorders and some mental health conditions, and antibiotics are aimed at treating bacterial infections. Therefore, only antidepressants directly target the treatment of depression.