What is the recommended starting dose and titration schedule of trazodone for an adult without severe cardiac disease, liver failure, or priapism, and how should the dosing be adjusted for patients over 65?

Trazodone Dosing for Depression

For adults with major depressive disorder, start trazodone at 150 mg/day in divided doses, increase by 50 mg every 3-4 days as tolerated, targeting 150-300 mg/day for antidepressant efficacy, with outpatient maximum of 400 mg/day (600 mg/day for inpatients). 1

Starting Dose and Initial Titration

• Begin with 150 mg/day in divided doses as the FDA-approved initial dose 1
• The dose should be initiated at a low level and increased gradually while monitoring clinical response and tolerability 1
• Increase by 50 mg/day every 3-4 days based on response 1
• Administer shortly after a meal or light snack to optimize absorption and reduce side effects 1

Alternative Lower Starting Approach

• Some clinicians may consider starting at 75-100 mg/day in divided doses for patients concerned about tolerability, though this is below the FDA-recommended starting dose 1, 2
• Evidence in elderly patients showed that starting at 150 mg total daily dose (50 mg three times daily) was well-tolerated and more effective than 75 mg daily (25 mg three times daily) 3

Target Therapeutic Dose

• Effective antidepressant doses are typically 150-300 mg/day 4, 2, 5
• Maximum outpatient dose: 400 mg/day in divided doses 1
• Maximum inpatient dose (for more severely depressed patients): 600 mg/day in divided doses 1
• Early antidepressant response can be seen within 1 week at 150 mg/day 6

Dosing Schedule Options

Once-daily dosing at bedtime is preferred and equally effective to divided dosing:

• Single nighttime dosing produces better sleep with less daytime drowsiness at treatment onset compared to multiple daily doses 4
• The 3-9 hour half-life supports dose-weighting at bedtime 4
• Recommended approach: 150 mg predominantly (but not necessarily all) at bedtime, increased to 200-300 mg as needed 4
• Differences between single nighttime and multiple daily dosing disappear with continued administration 4

Adjustments for Patients Over 65

Elderly patients respond similarly to younger adults and can be started at the same doses:

• A study in elderly inpatients demonstrated that 150 mg total daily dose (50 mg three times daily) was well-tolerated and more effective than 75 mg daily 3
• The higher starting dose (150 mg/day) showed more rapid improvement without adverse events outweighing therapeutic benefit 3
• Geriatric patients respond similarly to standard dosing regimens 4
• Monitor more closely for orthostatic hypotension in older adults, as this is more common in elderly patients and those with cardiovascular disease 5

Practical Considerations for Elderly Patients

• While standard starting doses apply, be vigilant for dizziness and orthostatic changes 5
• The same titration schedule (50 mg increases every 3-4 days) can be used 1
• Target the same therapeutic range of 150-300 mg/day 2, 5

Important Clinical Caveats

Common pitfalls to avoid:

• Do not confuse antidepressant dosing (150-300 mg/day) with hypnotic dosing (25-100 mg/day) - lower doses used for insomnia augmentation are insufficient for treating depression 2
• Occurrence of drowsiness may require administering a major portion of the daily dose at bedtime or dose reduction 1
• Screen for bipolar disorder before initiating treatment 1
• Allow at least 14 days between discontinuing MAOIs and starting trazodone, and vice versa 1

Drug Interactions Requiring Dose Adjustment

• With strong CYP3A4 inhibitors: Consider reducing trazodone dose based on tolerability 1
• With strong CYP3A4 inducers: Consider increasing trazodone dose based on therapeutic response 1

Discontinuation

• Gradually reduce the dosage rather than stopping abruptly to minimize discontinuation symptoms 1
• Once adequate response is achieved, dosage may be gradually reduced with subsequent adjustment depending on therapeutic response 1

Notable Guideline Position

The American Academy of Sleep Medicine (2017) recommends against using trazodone for insomnia based on a single trial of 50 mg showing no clinically significant improvements in sleep parameters 7. However, this recommendation applies specifically to insomnia treatment at 50 mg doses, not to antidepressant treatment at therapeutic doses of 150-300 mg/day 7.