Atypical antidepressant (alpha-2 adrenergic antagonist with serotonergic effects)

Remeron (mirtazapine) Withdrawal

Remeron (mirtazapine) has a moderate discontinuation profile. The most distinctive aspect is rebound insomnia and increased anxiety, particularly in patients who were taking Remeron primarily for sleep. The relatively long half-life smooths the washout.

By Dr. Ben Soffer, DO — board-certified physician, at-home ketamine therapy in Florida and New Jersey.

Half-life

~20-40 hours.

Withdrawal timeline

Onset— 1-3 days after dose reduction

Symptoms emerge gradually.

Peak— Week 1

Sleep disturbance and anxiety rebound peak in the first week.

Resolution— 2-4 weeks

Most patients return to baseline within a month.

Common symptoms

  • Rebound insomnia (often pronounced)
  • Anxiety
  • Irritability
  • Vivid dreams or nightmares
  • Headache
  • Nausea

Less common

  • Dizziness
  • Sweating
  • Itching

Tapering guidance

  • A typical taper reduces by 7.5 or 15 mg every 1-2 weeks. The orally disintegrating tablet form allows finer splitting if needed.
  • For patients using Remeron primarily for sleep, plan a sleep-support strategy before tapering (sleep hygiene, alternative agent if needed) because rebound insomnia can be intense.
  • Coordinate the taper with the prescribing physician.

Where ketamine therapy fits

Remeron is compatible with at-home ketamine therapy. The two work through different mechanisms with no required washout. Continue Remeron as prescribed during ketamine treatment unless the prescribing physician advises otherwise.

Check ketamine therapy eligibilityMedication safety with ketamine

Frequently asked questions

Why is insomnia worse after stopping Remeron?

Remeron is strongly sedating because of its histamine receptor blockade. When stopped, the histamine system rebounds, often producing pronounced insomnia for 1-2 weeks. This is typically self-limited but can be very uncomfortable.

How long does Remeron withdrawal last?

Most patients are through the acute phase within 2-4 weeks. Rebound insomnia and anxiety usually peak in the first week.

Is Remeron compatible with ketamine therapy?

Yes. The two work through different mechanisms with no required washout.

Important: This page is informational and does not constitute medical advice or a recommendation to start, stop, or change any medication. Tapering psychiatric medications should always be coordinated with the prescribing physician. Compounded ketamine for anxiety, depression, PTSD, and chronic pain is not FDA approved.

Browse all medication withdrawal guides.