Which of the following medications is classified as a selective serotonin reuptake inhibitor (SSRI)?

Fluvoxamine is classified as a selective serotonin reuptake inhibitor (SSRI), which means it primarily works by increasing the levels of serotonin in the brain. SSRIs are commonly prescribed for various conditions, particularly depression and anxiety disorders. They help alleviate symptoms by blocking the reabsorption (reuptake) of serotonin into neurons, making more serotonin available in the synaptic space for receptor binding, thereby enhancing mood and emotional balance.

In contrast, the other medications listed are not SSRIs. Diazepam is a benzodiazepine, primarily used for its anxiolytic (anxiety-reducing) properties. It works by enhancing the effects of a neurotransmitter called gamma-aminobutyric acid (GABA), leading to sedation and muscle relaxation. Amoxicillin is an antibiotic, used to treat bacterial infections and has no role in the modulation of serotonin levels. Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) used for pain relief and inflammation reduction, and it does not affect serotonin pathways. Therefore, the classification of fluvoxamine as an SSRI is accurate and aligns with its therapeutic use in treating mood disorders.