Nursing care
Trazodone: what to check before you give it
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated September 2026
Short answer
Trazodone is an antidepressant most often prescribed off-label at low doses for insomnia because it is sedating and non-habit-forming. Its rare but serious risk is priapism, a prolonged, painful erection that requires emergency care, and every patient started on it must be told to seek immediate treatment if it occurs.
What it does and why it is prescribed
Trazodone is technically an antidepressant, but its strong sedative effect means the dose used for depression is often higher than the dose used for sleep. At low doses, typically 25 to 100 mg at bedtime, it is prescribed off-label as a sleep aid, frequently for patients who cannot tolerate benzodiazepines or who need something without dependence potential.
At higher, antidepressant-range doses it works on serotonin, similarly to other antidepressants in its class, but this use is now less common than its off-label role for insomnia. A nurse reviewing a medication list should not assume a low-dose trazodone order means the patient is being treated for depression; more often it means they are being treated for sleep.
Nursing considerations before giving it
Give trazodone at bedtime and warn the patient it will make them drowsy, sometimes markedly so the next morning. Assess fall risk before the first dose, particularly in older adults, since the combination of sedation and orthostatic hypotension raises fall risk significantly in this population.
Check for other CNS depressants on the medication list, including opioids, benzodiazepines, and alcohol use, since combining them compounds sedation. Ask male patients specifically about any history of priapism or conditions that predispose to it, such as sickle cell disease, before the first dose, since this is the teaching point that carries the most clinical weight with this drug.
What to monitor
Monitor blood pressure, sitting and standing, since orthostatic hypotension is common, especially early in treatment and in older adults. Monitor sedation level and morning alertness, particularly before the patient drives or operates machinery.
Monitor sleep pattern and mood over the first few weeks to assess whether the drug is achieving its intended purpose, whether that is sleep or depression treatment. As with any antidepressant, monitor for increased suicidal ideation early in treatment. Cardiac monitoring is warranted in patients with pre-existing arrhythmia, since trazodone has been associated with QT prolongation in some patients.
Side effects versus adverse effects
Expected side effects include daytime drowsiness, dry mouth, dizziness, and headache. These are common, usually mild, and often improve as the body adjusts, though persistent morning grogginess may warrant a dose or timing adjustment rather than discontinuation.
Adverse effects that require immediate action are different in kind, not just degree. Priapism is the defining one: an erection lasting more than four hours, unrelated to sexual activity, that requires emergency treatment to prevent permanent tissue damage. Significant orthostatic hypotension causing syncope, and any sign of serotonin syndrome such as agitation, tremor, and hyperthermia, also warrant urgent evaluation rather than watchful waiting.
What to hold for and when to call
Hold the dose and notify the prescriber for significant hypotension, particularly a marked drop in blood pressure on standing or symptomatic dizziness that puts the patient at fall risk. Hold it if the patient reports any erection lasting longer than expected, and treat this as a same-day, not next-appointment, concern.
Call the prescriber for new or worsening depression, suicidal thoughts, or any sign of serotonin syndrome, especially if the patient is also on another serotonergic drug such as an SSRI or SNRI. In an inpatient setting, priapism lasting more than four hours is a urology emergency and should be escalated immediately rather than managed on the unit.
Patient teaching
Tell the patient to take trazodone at bedtime, not earlier in the day, because of the sedation, and to avoid alcohol, which intensifies both the sedative effect and the orthostatic hypotension risk. Warn them to rise slowly from sitting or lying to standing, especially at night, to reduce fall risk.
The teaching point that matters most for male patients is priapism: explain plainly that an erection lasting more than four hours, without sexual stimulation, is a medical emergency and they should go to the emergency department rather than wait it out or feel embarrassed to mention it. This single piece of teaching, given clearly at the start of treatment, is the one most likely to prevent lasting harm.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our mental health practice questions are the closest set to what this page covers.
Common questions
Why is trazodone prescribed for sleep instead of depression?
At low doses it is sedating without being habit-forming, which makes it a common off-label choice for insomnia, particularly when a patient cannot tolerate or should avoid benzodiazepines. The dose used for sleep is typically much lower than the dose used to treat depression.
What is priapism and why does trazodone teaching always mention it?
Priapism is a prolonged, painful erection unrelated to sexual activity, lasting more than four hours, that can cause permanent tissue damage if untreated. It is a rare but serious adverse effect specific to trazodone, so patients must be told to seek emergency care immediately if it occurs.
Can trazodone be combined with an SSRI?
It is sometimes combined with an SSRI, but the combination raises the risk of serotonin syndrome and needs closer monitoring. Watch for agitation, tremor, sweating, and hyperthermia, and report any of these promptly.
Is trazodone safe for older adults?
It can be used, but sedation and orthostatic hypotension raise fall risk significantly in this population, so assess fall risk before the first dose and monitor blood pressure sitting and standing throughout treatment.
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