While mild positional dizziness is common, a significant drop in blood pressure can cause actual fainting (syncope), which carries real injury risk — especially for older adults, people on other blood-pressure-lowering medications, or anyone with a heart condition. Trazodone's label lists low blood pressure that causes dizziness or faintness when changing position among the serious side effects to know about.
Report any fainting episode to your prescriber. They may adjust your dose, timing, or evaluate for other contributing factors.