Trazodone 100 mg is a prescription prescription medication officially approved to treat major depression. At the 100 mg strength, doctors very commonly prescribe it off-label as a sleep aid to treat insomnia because it causes drowsiness, or use it to help manage anxiety.Primary and Off-Label UsesDepression: Approved by health agencies to balance brain chemicals like serotonin and improve mood.Insomnia (Off-label): Frequently used at lower doses (such as 50 mg to 100 mg) taken at bedtime to help people fall asleep and stay asleep.Anxiety (Off-label): Sometimes prescribed to help calm anxious thoughts or anxiety related to sleep issues.Key Facts to KnowHow to take it: Usually taken shortly after a meal or a light snack. If used for sleep, it is taken right before bedtime.Common side effects: Drowsiness, dizziness, dry mouth, headache, and feeling tired.Safety warning: Do not stop taking it suddenly without talking to your doctor, as it can cause withdrawal or other effects.