Mirtazapine Dosing and Sedation

Introduction to Mirtazapine

• The American Academy of Family Physicians recommends starting mirtazapine at 15mg once daily at bedtime, as the effective dosage range is 15-45mg daily, with 7.5mg considered subtherapeutic 1

Clinical Evidence on Dosing and Sedation

• The effective dosage range of mirtazapine is 15-45mg daily, with pharmacokinetic studies showing dose-proportional plasma concentrations: 15mg produces mean levels of 7.3±3.2 ng/mL, 30mg produces 18±7 ng/mL, and 45mg produces 28±12 ng/mL 2
• The maximum recommended dose is 30-45mg daily, according to the American family physician 1

Sleep Benefits and Side Effects

• The National Comprehensive Cancer Network recommends mirtazapine as particularly effective for patients with both depression and insomnia, without dose-specific restrictions for sleep benefits 4
• Mirtazapine is noted as "potent and well tolerated; promotes sleep, appetite, and weight gain" at the standard 7.5-30mg bedtime dosing range, according to the American family physician 1

Practical Dosing Algorithm

• The American family physician recommends starting at 15mg at bedtime for most patients, and assessing response within 1-2 weeks of any dose modification 1
• If inadequate response at 6-8 weeks, increase to 30mg, then potentially to 45mg maximum, according to the American family physician 1