Which of the following is a use for cyclobenzaprine?

Cyclobenzaprine is primarily used as a muscle relaxant to reduce muscle spasms. It operates by acting on the central nervous system to provide relief from muscle tension and discomfort associated with acute musculoskeletal conditions. This makes it particularly effective in therapeutic scenarios where muscle spasticity occurs, typically following an injury or surgery.

The other options listed do not align with the pharmacological action of cyclobenzaprine. For instance, it is not utilized as an antidepressant, nor is it indicated for lowering blood pressure or treating infections, which would require an antibiotic. Thus, recognizing cyclobenzaprine's specific application as a muscle relaxant is essential in clinical practice.