The most common side effects of Trazodone include:

• Sleepiness
• Dizziness
• Constipation
• Blurry vision

Tell your healthcare provider if you have any side effect that bothers you or that does not go away.

Trazodone can cause serious side effects or death.

Serious side effects include:

• Serotonin syndrome.
• Feeling high or in a very good mood, then becoming irritable, or having too much energy, feeling like you have to keep talking or do not sleep (Mania).
• Irregular or fast heartbeat or faint (QT prolongation).
• Low blood pressure. You feel dizzy or faint when you change positions (go from sitting to standing).
• Unusual bruising or bleeding.
• Erection lasting for more than 6 hours (Priapism).
• Low sodium in your blood (Hyponatremia). Symptoms of hyponatremia include: headache, feeling weak, feeling confused, trouble concentrating, memory problems and feeling unsteady when you walk.

Get medical help right away, if you have any of the symptoms listed above.

Call a healthcare provider right away if you have any of the following symptoms, especially if they are new, worse, or worry you:

• Thoughts about suicide or dying
• Attempts to commit suicide
• New or worse depression
• New or worse anxiety
• Feeling very agitated or restless
• Panic attacks
• Trouble sleeping (insomnia)
• New or worse irritability
• Acting aggressive, being angry or violent
• Acting on dangerous impulses
• An extreme increase in activity and talking (mania)
• Other unusual changes in behavior or mood