Trazodone is one of the more commonly prescribed medications for older adults, used primarily for sleep problems and depression. It is generally considered safer than several alternatives, particularly benzodiazepines and older tricyclic antidepressants, but it carries real risks in elderly patients that deserve careful consideration. The most significant concerns are falls, blood pressure drops, and drug interactions.
Why Trazodone Is So Common in Older Adults
Trazodone is FDA-approved for major depression, but most prescriptions for older adults are written off-label for insomnia. At low doses (25 to 100 mg), it works as a sedative by blocking receptors involved in arousal, including histamine and serotonin receptors. At higher doses (up to 300 mg or more), it acts as a full antidepressant by preventing the brain from reabsorbing serotonin too quickly.
It’s also prescribed off-label for anxiety, PTSD-related nightmares, and behavioral symptoms in dementia. Its popularity among older adults comes partly from what it doesn’t do: unlike benzodiazepines, it doesn’t create physical dependence, and unlike many sleep drugs, it doesn’t appear to significantly prolong the heart’s QT interval, a measure of cardiac electrical activity that matters more as people age and take more medications.
Fall Risk Is the Biggest Safety Concern
Falls are the leading injury risk for trazodone users over 65. The medication blocks alpha-1 adrenergic receptors, which help maintain blood vessel tone. This causes blood pressure to drop when standing up, a condition called orthostatic hypotension that affects 1 to 7% of trazodone users. Older adults and those with heart disease are most vulnerable. That blood pressure drop can cause dizziness, unsteadiness, and falls, particularly at night when getting up to use the bathroom.
A study in nursing home residents published in the New England Journal of Medicine found that new trazodone users had a 20% higher rate of falls compared to non-users. That’s notably lower than the doubled fall rate seen with tricyclic antidepressants or the 80% increase with SSRIs. But a Canadian study of nursing home residents found that trazodone, benzodiazepines, sleep medications like zopiclone, and atypical antipsychotics all carry a similar risk of injurious falls and major fractures. In other words, trazodone is not the free pass it’s sometimes assumed to be.
The risk is highest in the first days and weeks after starting the medication or increasing the dose. Extended-release formulations or splitting doses throughout the day can reduce the sharp blood pressure drops that come with a single large dose.
Cardiac Safety Looks Relatively Favorable
Many antidepressants can lengthen the QT interval on an EKG, raising the risk of dangerous heart rhythm problems. This is a particular concern for older adults, who often take multiple medications and have existing heart conditions. Trazodone, however, has shown no significant increase in QT interval in studies. One analysis actually found a slight, non-significant decrease of about 12 milliseconds.
That said, periodic EKG monitoring is still reasonable for older adults starting any new psychiatric medication, especially when combined with other drugs that affect heart rhythm or electrolyte levels. Diuretics, commonly prescribed for blood pressure, can lower potassium and magnesium, which makes QT prolongation more likely regardless of the antidepressant being used.
Trazodone and Dementia: A Complicated Picture
Trazodone is frequently prescribed to people with dementia, both for sleep disruption and for agitation. The evidence here splits in an interesting way.
For agitation in dementia, trazodone does not appear to work. A systematic review comparing antidepressants for dementia-related agitation found trazodone performed no better than placebo, ranking below citalopram, sertraline, and mirtazapine. Worse, it had the highest rate of adverse events among all antidepressants studied, with over four times the odds of side effects compared to placebo. The researchers concluded that trazodone is “probably not an appropriate antidepressant drug for the treatment of agitation symptoms in patients with dementia.”
For cognitive decline, though, the picture is more encouraging. A retrospective study from the Journal of Alzheimer’s Disease found that long-term trazodone users experienced cognitive decline at less than half the rate of non-users over a four-year period. Non-users lost cognitive function 2.6 times faster on standard testing. This held true even when researchers looked only at patients with Alzheimer’s pathology, where non-users still declined 2.4 times faster. The theory is that trazodone enhances slow-wave sleep, the deep restorative phase that helps clear toxic proteins from the brain. This is promising but based on observational data, not a controlled trial, so the association could partly reflect other differences between the groups.
Dosing Starts Low in Older Adults
Standard prescribing guidance calls for a maximum starting dose of 100 mg per day in older patients, compared to higher starting doses in younger adults. In practice, many clinicians start even lower. For sleep, doses of 25 to 50 mg at bedtime are common. For depression, extended-release formulations often begin at 75 mg, and many older patients do well without ever reaching the standard adult dose of 300 mg. A longitudinal analysis of patients over 65 found the median dose was 100 mg per day.
The “start low, go slow” approach matters because older adults metabolize drugs more slowly, have less water in their bodies to dilute medications, and are more sensitive to blood pressure changes. Taking trazodone with food slows absorption and can reduce the intensity of side effects.
Drug Interactions to Watch For
Older adults typically take multiple medications, which raises the stakes for interactions. The most serious concern is serotonin syndrome, a potentially dangerous buildup of serotonin that can occur when trazodone is combined with other serotonergic drugs like SSRIs, SNRIs, or certain pain medications. Symptoms include confusion, rapid heart rate, muscle twitching, and fever.
Trazodone also carries a risk of hyponatremia, a drop in blood sodium levels, which is more common in older adults and can be worsened by diuretics. Symptoms of hyponatremia include headache, confusion, nausea, and in severe cases, seizures. Sodium levels are worth monitoring when starting trazodone, particularly if you’re also taking a diuretic or another serotonergic antidepressant.
How It Compares to Other Sleep Medications
The reason trazodone remains popular for elderly insomnia, despite its risks, is that the alternatives have their own problems. Benzodiazepines carry a higher fall risk (doubled versus 20% higher for trazodone), create physical dependence, and are associated with cognitive impairment. Z-drugs like zopiclone produce a comparable rate of falls and fractures to trazodone but also carry dependence risk. Over-the-counter antihistamine sleep aids can cause confusion and urinary retention in older adults.
Trazodone’s advantages are the lack of dependence potential, minimal cardiac rhythm effects, and possible cognitive benefits with long-term use. Its disadvantages are orthostatic hypotension, daytime grogginess (especially at higher doses), and the lack of strong evidence for some of its most common off-label uses. For sleep in older adults, it remains a reasonable option when non-drug approaches like sleep hygiene, consistent wake times, and reduced daytime napping aren’t enough on their own.