Adverse effects · Response by urgency
Trazodone Side Effects From Monitoring to Urgent Care
Trazodone side effects range from symptoms that may be monitored to rare warning signs that need urgent care. Timing, severity, daily impact and other medicines help a clinician interpret what is happening. Do not stop, double or counteract a prescribed dose on your own unless emergency professionals direct immediate action.
Medically reviewed by
Psychiatry, addiction medicine and clinical informatics
Medical review completed August 27, 2026
Record an adverse effect usefully
1. Name the symptom
Use concrete terms rather than only saying you feel unwell.
2. Add timing
Note when it began relative to doses, meals and other medicines.
3. Describe impact
Record driving, falls, work, sleep and ability to function.
4. Use the right urgency
Choose routine, prompt, crisis or emergency contact based on severity.
Side-effect response guide
| Finding | Response | Context |
|---|---|---|
| Mild drowsiness | Track and discuss | Driving and work |
| Repeated near-fainting | Prompt review | Blood pressure or rhythm |
| Painful prolonged erection | Urgent treatment | Time-sensitive |
| Suicide attempt | Emergency services | Immediate danger |
Common effects can still be clinically important
MedlinePlus lists effects such as weakness or tiredness, appetite or weight changes, diarrhea, stuffy nose, swelling and sexual problems. Drowsiness and dizziness are especially relevant to driving, falls and work. Persistent or disruptive effects deserve discussion even when they do not meet an emergency threshold.
Orthostatic symptoms can appear when standing
Trazodone can cause orthostatic hypotension and syncope. Lightheadedness after standing, near-fainting or falls should be recorded with timing and other blood-pressure medicines. Actual fainting, injury, chest symptoms or an abnormal heartbeat requires prompt assessment because rhythm and blood-pressure problems can overlap.
Serotonin syndrome needs a pattern review
Concerning combinations can include agitation or confusion with fever, sweating, fast heartbeat, blood-pressure changes, tremor, rigidity, incoordination, nausea, vomiting or diarrhea. Risk can rise with other serotonergic medicines. A rapidly developing cluster should receive urgent medical assessment rather than waiting for the next scheduled visit. For more detail on this decision, review trazodone safety.
Bleeding can be more likely with interacting medicines
Aspirin, NSAIDs, antiplatelet drugs, warfarin and other anticoagulants can add to bleeding risk described in the label. Unusual bruising should be reported, while severe or persistent bleeding, vomiting blood, black stools or signs of significant blood loss require urgent or emergency evaluation.
Heart rhythm warnings deserve specific history
The label warns that trazodone increases the QT interval and can cause arrhythmias. Long QT syndrome, prior arrhythmia, fainting, recent heart attack and QT-prolonging medicines may change the decision. Palpitations with fainting, severe weakness or chest pain should not be managed through routine messaging alone.
Mood activation can signal mania or hypomania
New unusually elevated or irritable mood, much less need for sleep, racing thoughts, pressured speech or risky behavior may indicate activation. The prescriber should know promptly. These changes can alter diagnosis and treatment, especially when there is a personal or family history of bipolar disorder. A related clinical question is covered in trazodone dosage.
Priapism requires urgent treatment
A painful prolonged erection is a time-sensitive warning in the prescribing information. Waiting can cause lasting harm. The patient should seek urgent medical care rather than trying home measures or waiting for a portal response. Relevant blood disorders or penile conditions belong in the history before treatment.
A symptom log should remain brief and concrete
Record the symptom, start time, relation to the dose, severity, duration, effect on daily activity and any other medicine or substance used that day. This helps the clinician distinguish a tolerability problem from an interaction or unrelated illness. Do not delay urgent care to complete the log; it is a communication tool, not a gate.
Do not treat another medicine as an automatic antidote
Adding a stimulant, sleep product, anti-nausea medicine or pain reliever can create interactions and obscure the original effect. Ask the prescriber or pharmacist before trying to counteract symptoms. The safer response may be observation, a clinical adjustment, a different treatment or evaluation for another cause.
Questions readers ask after this review
What are common trazodone side effects?
Patient information lists tiredness, weakness, appetite or weight changes, diarrhea, stuffy nose, swelling and sexual effects; drowsiness and dizziness also matter.
When is dizziness more concerning?
Repeated near-fainting, actual fainting, falls, palpitations or chest symptoms need prompt assessment.
What symptoms can suggest serotonin syndrome?
A concerning cluster may include agitation, fever, sweating, fast heartbeat, tremor, rigidity, incoordination and gastrointestinal symptoms.
Can trazodone affect mood unexpectedly?
Yes. Worsening depression, suicidal thoughts or mania-like activation requires prompt contact or urgent help.
Should I stop trazodone after a side effect?
Contact the prescriber unless emergency professionals direct immediate action. Abrupt stopping can create additional symptoms.
Primary and authoritative sources
- DailyMed, U.S. National Library of Medicine: Trazodone hydrochloride tablet prescribing information — label updated August 19, 2026; checked August 27, 2026.
- MedlinePlus, U.S. National Library of Medicine: Trazodone drug information — checked August 27, 2026.
- Substance Abuse and Mental Health Services Administration: 988 Suicide & Crisis Lifeline — checked August 27, 2026.
Educational information for human care only. This page does not diagnose a condition, guarantee a prescription, select an individual dose, replace a clinician or provide veterinary advice.
