Check with your doctor if any of these most common side effects persist or become bothersome:
Blurred vision, constipation, decreased appetite, dizziness, drowsiness, dry mouth, general body discomfort, headache, incoordination, light-headedness, muscle aches/pains; nausea, nervousness, sleeplessness, stomach pain, stuffy nose, swelling of the skin, tiredness, tremors.
Seek medical attention right away if any of these severe side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blood in urine, chest pain, fainting, hallucinations, irregular heartbeat, light-headedness when rising from a lying or seated position; prolonged, inappropriate, or painful erections; seizures, shortness of breath, stroke, vomiting.
Symptoms of overdose may include drowsiness, weakness, low blood pressure, vomiting, penis erection that is painful or prolonged, slow heart rate, rapid or irregular pulse, seizure (black-out or convulsions), or breathing that slows or stops. Seek emergency medical attention if you think you have used too much of this medicine. An overdose of Trazodone can be fatal when it is taken with alcohol, barbiturates such as phenobarbital, or sedatives such as diazepam (Valium).