Trazodone 50 mg Side Effects
Trazodone 50 mg commonly causes drowsiness/sedation, dizziness, dry mouth, and headache, with more serious but less common risks including orthostatic hypotension, priapism (in men), cardiac arrhythmias, and increased bleeding risk. 1
Common Side Effects (Most Frequent)
The FDA-approved labeling and clinical guidelines consistently identify these most common adverse effects at the 50 mg dose:
- Drowsiness/Somnolence/Sedation - This is the most frequently reported side effect, occurring in a substantial proportion of patients 2, 1, 3
- Dizziness - Common across all patient populations 2, 1, 3
- Dry mouth - Frequently reported 2, 1
- Headache - Common adverse effect 2, 1
- Nausea - May occur, particularly early in treatment 2, 1
- Blurred vision - Can occur, particularly at higher risk in certain populations 4
- Constipation - Reported in clinical trials 2
Serious Side Effects Requiring Immediate Attention
Cardiovascular Effects
- Orthostatic hypotension and syncope - Risk of dizziness or fainting when changing positions (sitting to standing). This is particularly concerning in elderly patients or those on antihypertensive medications 1
- Cardiac arrhythmias - Including QT prolongation, which can lead to torsade de pointes and ventricular tachycardia, even at doses of 100 mg/day or less 1
Priapism (Men Only)
Men experiencing an erection lasting more than 4 hours must immediately discontinue trazodone and seek emergency medical attention. Untreated priapism can result in permanent erectile tissue damage. Higher risk in men with sickle cell anemia, multiple myeloma, leukemia, or anatomical penile deformities 1.
Bleeding Risk
Trazodone increases bleeding risk, particularly when combined with NSAIDs, aspirin, antiplatelet drugs, or anticoagulants like warfarin. Monitor for unusual bruising, bleeding, or gastrointestinal bleeding 1.
Neuropsychiatric Effects
- Serotonin syndrome - When combined with other serotonergic drugs (SSRIs, SNRIs, MAOIs, tramadol). Symptoms include agitation, hallucinations, fast heartbeat, muscle rigidity, fever, nausea, vomiting, diarrhea 1
- Suicidal thoughts - Particularly in children, adolescents, and young adults under age 24 1
- Activation of mania/hypomania - Risk in patients with bipolar disorder 1
Other Serious Effects
- Hyponatremia - Low sodium levels, especially in elderly patients, those on diuretics, or volume-depleted states. Symptoms include headache, confusion, weakness, unsteadiness leading to falls 1
- Angle-closure glaucoma - Pupillary dilation can trigger attacks in susceptible patients 1
Important Clinical Considerations
Drug Interactions
Trazodone 50 mg has significant interaction potential with:
- MAOIs - Contraindicated within 14 days
- Other serotonergic drugs - Risk of serotonin syndrome
- Anticoagulants/antiplatelets - Increased bleeding risk
- Antihypertensives - May require dose reduction due to additive hypotensive effects 1
Cognitive and Motor Impairment
Patients should not drive or operate heavy machinery until they know how trazodone affects them. The sedative effects can significantly impair mental and physical abilities required for potentially hazardous tasks 1.
Withdrawal Symptoms
Abrupt discontinuation can cause nausea, sweating, irritability, agitation, dizziness, sensory disturbances (electric shock sensations), anxiety, confusion, insomnia, and seizures. Gradual dose reduction is recommended 1.
Special Populations
Elderly Patients
At particular risk for:
- Falls due to orthostatic hypotension and sedation
- Cognitive impairment
- Hyponatremia
- Cardiac effects 5, 1
Dosing Context
While 50 mg is a common starting dose, the 2020 VA/DoD guidelines specifically advise against using trazodone for chronic insomnia due to low-quality efficacy evidence being outweighed by its adverse effect profile 6. The 2017 American Academy of Sleep Medicine guidelines similarly suggest not using trazodone for sleep onset or maintenance insomnia 7.
Monitoring Recommendations
- Blood pressure (especially orthostatic changes)
- Cardiac rhythm if risk factors present
- Sodium levels in high-risk patients
- Coagulation indices if on warfarin
- Mental status changes, particularly suicidality in young adults 1