A nurse is caring for a client who has a new diagnosis of major depressive disorder. Which of the following medications should the nurse expect the provider to prescribe to the client as a first-line treatment?

Choice A reason: Serotonin deficiency is a well-known risk factor for major depressive disorder. Serotonin is a neurotransmitter that plays a crucial role in mood regulation, and its deficiency can lead to symptoms of depression. This is why many antidepressant medications, such as selective serotonin reuptake inhibitors (SSRIs), aim to increase serotonin levels in the brain.

Choice B reason: Acute bronchitis is a respiratory condition that involves inflammation of the bronchial tubes. While it can cause significant discomfort and health issues, it is not directly linked to major depressive disorder. However, chronic illnesses can sometimes contribute to depressive symptoms due to the ongoing stress and physical limitations they impose.

Choice C reason: Elevated calcium levels, or hypercalcemia, can cause a variety of symptoms, including fatigue, confusion, and depression-like symptoms. However, it is not a primary risk factor for major depressive disorder. Hypercalcemia is usually related to other underlying conditions such as hyperparathyroidism or certain cancers.

Choice D reason: Being an only child is not considered a risk factor for major depressive disorder. While family dynamics and social relationships can influence mental health, there is no direct evidence linking being an only child to an increased risk of developing major depressive disorder.

Choice A reason: Midazolam is a benzodiazepine used primarily for sedation, anxiety relief, and anesthesia. It is not used as a first-line treatment for major depressive disorder.

Choice B reason: Fluoxetine is a selective serotonin reuptake inhibitor (SSRI) commonly prescribed as a first-line treatment for major depressive disorder. SSRIs work by increasing the levels of serotonin in the brain, which can help improve mood and alleviate depressive symptoms.

Choice C reason: Cyclobenzaprine is a muscle relaxant used to relieve muscle spasms. It is not indicated for the treatment of major depressive disorder.

Choice D reason: Valproic acid is primarily used as a mood stabilizer and anticonvulsant. It is not typically used as a first-line treatment for major depressive disorder, although it may be used in cases of bipolar disorder.