Zyprexa Withdrawal & Tapering Guide
olanzapine
Boxed Warning
Increased mortality in elderly patients with dementia-related psychosis. Post-injection delirium/sedation syndrome with extended-release IM formulation (Zyprexa Relprevv).
In short
Zyprexa (olanzapine) is an Atypical Antipsychotic with a half-life of 21–54 hours. Tablets can be split. It is also sold as Zyprexa Relprevv, Zyprexa Zydis.
- Class
- Atypical Antipsychotic
- Half-life
- 21–54 hours
- Common doses
- 2.5mg, 5mg, 10mg, 15mg, 20mg
Educational reference only. Dose changes are decided with the prescriber who knows your history.
Overview
Olanzapine is an atypical antipsychotic approved for schizophrenia and bipolar disorder (manic/mixed episodes, maintenance, and bipolar depression in combination with fluoxetine). It is effective but carries the highest metabolic risk among atypical antipsychotics.
2.5mg, 5mg, 10mg, 15mg, 20mg
Tablets: 2.5mg, 5mg, 7.5mg, 10mg, 15mg, 20mg; Orally disintegrating tablets (Zydis): 5mg, 10mg, 15mg, 20mg; Intramuscular injection: 10mg; Extended-release injection (Zyprexa Relprevv): 210mg, 300mg, 405mg
Category C (risk cannot be ruled out)
Mechanism of Action
Antagonist at dopamine D1–D4, serotonin 5-HT2A/2C/3/6, histamine H1, muscarinic M1–M5, and alpha-1 adrenergic receptors. The broad receptor profile contributes to efficacy but also drives significant weight gain and metabolic effects.
Taper Notes
Tablets can be split. Weight gain reversal during tapering. Rebound insomnia common.
Hyperbolic Tapering Guidance
Slow gradual taper essential. Tablets available in small increments (2.5mg). Monitor for supersensitivity symptoms.
Summary written by TaperCommunity, informed by the Maudsley Deprescribing Guidelines (Horowitz & Taylor) and related literature — see Sources & References below. Not affiliated with or endorsed by the Maudsley.
Common Withdrawal Symptoms
Interactions & Safety
Drug Interactions
- CYP1A2 inhibitors (fluvoxamine, ciprofloxacin) increase olanzapine levels — reduce dose
- CYP1A2 inducers (smoking, carbamazepine) decrease olanzapine levels — dose adjustment needed (smokers need higher doses)
- CNS depressants — additive sedation
Food Interactions
- Food does not significantly affect absorption
- Avoid alcohol (additive CNS depression)
Contraindications
- Known hypersensitivity to olanzapine
Toxicity
Significant metabolic syndrome (weight gain, hyperglycemia, diabetes, dyslipidemia — highest among atypical antipsychotics). Sedation. Orthostatic hypotension. Tardive dyskinesia. NMS rarely.
Pharmacokinetics
ADME Profile
Well absorbed after oral administration. Bioavailability ~60% due to first-pass metabolism. Tmax ~6 hours. Food does not significantly affect absorption.
~1000 L (~14 L/kg)
Extensively metabolized hepatically via CYP1A2 (primary) and CYP2D6 via glucuronidation and oxidation. Major metabolites (10-N-glucuronide and 4'-N-desmethyl) are inactive.
Renal (~57%) and fecal (~30%). Approximately 7% excreted unchanged in urine.
~93%
~26 L/hr (apparent oral clearance)
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Related Articles About Zyprexa
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Other Drug Profiles
The arithmetic of a proportional reduction
The Maudsley Deprescribing Guidelines and NICE NG222 describe reducing Atypical Antipsychotic medications by a proportion of the previous dose rather than by a fixed amount, so each cut is smaller than the last. The table shows what that arithmetic produces at 10% per step, using 10 mg only as a worked example. How large each step is, how long it is held, and whether this pattern applies at all are decisions for the person and their prescriber.
| Step | % of starting dose | Worked example (10 mg start) |
|---|---|---|
| Start | 100% | 10 mg |
| Step 1 | 90% | 9 mg |
| Step 2 | 81% | 8.1 mg |
| Step 3 | 73% | 7.29 mg |
| Step 4 | 66% | 6.56 mg |
| Step 5 | 59% | 5.9 mg |
| Step 6 | 53% | 5.31 mg |
| Step 7 | 48% | 4.78 mg |
| Step 8 | 43% | 4.3 mg |
This is an illustration of a published method, not a schedule for anyone. It does not account for how long you have taken Zyprexa, your current dose, formulation, or history. TaperCommunity does not recommend doses or dose changes; those are agreed with your prescriber.
Frequently asked questions about Zyprexa
What are the withdrawal symptoms of Zyprexa (olanzapine)?
Common withdrawal symptoms of Zyprexa (olanzapine) include: rebound insomnia, anxiety, nausea, psychosis risk, sweating. Symptom severity varies by individual, dose, and duration of use.
How should I taper off Zyprexa (olanzapine)?
Tablets can be split. Weight gain reversal during tapering. Rebound insomnia common. Slow gradual taper essential. Tablets available in small increments (2.5mg). Monitor for supersensitivity symptoms.
Can I stop Zyprexa cold turkey?
Stopping Zyprexa abruptly is not recommended. Its half-life is 21–54 hours, and the receptor adaptations built up during treatment do not reverse at that speed, so a sudden stop tends to produce the sharpest withdrawal. Prescribing guidance favours gradual, proportional reductions agreed with your prescriber.
How long does Zyprexa stay in your system?
Zyprexa (olanzapine) has a half-life of 21–54 hours. A drug is mostly cleared after about five half-lives, so Zyprexa is largely out of the body roughly 4 to 11 days after the last dose, longer in older adults or with liver or kidney impairment. Withdrawal symptoms often begin before the drug has fully cleared and continue after it has, because the adaptations the brain made during treatment reverse more slowly than the drug leaves the blood.
Recent discussions about Zyprexa
What members tapering Zyprexa are asking and reporting right now. Personal experience, not medical advice.
- Zyprexa Tapering threadThis is the forum for everyone tapering Zyprexa. When you log a check-in in My Taper, it will appear here. That way you can see how others on the same medication are…Based · 8 months ago
- TaperHi. Ive been on olanzapine 2.5mg for about 15 years. It was given to me for anxiety and depression that wasnt going away and it worked. Been struggling again this year…Dan · 4 days ago · 4 replies
- Looking for Zyprexa taper success stories!Hello, my name is Tracy. I’ve been on Zyprexa since November 2026. I started at 5mg for insomnia, and started tapering off in April. I’m currently at 1mg and looking for…Tracy · 7 days ago · 14 replies
- Hi I’m JoeWish me luck, I have an appointment tomorrow to discuss tapering off my medication (olanzapine).The side effects have been horrible and I’ve essentially been bedridden…Joe · 10 days ago · 15 replies
- Hey everyone,I just wanted to introduce myself. My name is Jodi, I’m from NSW, Australia. I’m currently tapering off Olanzapine. I’ve been tapering now for a bit over 12 months, and…Jodi · 22 days ago · 11 replies
Sources & References
Zyprexa (olanzapine) information on this page is sourced from peer-reviewed research, regulatory bodies, clinical guidelines, and patient-advocacy organizations.
Encyclopedic & chemical databases
Neutral, high-authority entity references.
Peer-reviewed research
Primary literature cited in this taper guide.
- Horowitz MA, Jauhar S, Natesan S, Murray RM, Taylor D 2021 — A method for tapering antipsychotic treatment that may minimize the risk of relapse (Schizophrenia Bulletin)
- Tranter R, Healy D 1998 — Antipsychotic withdrawal symptoms: phenomenology and pathophysiology (Journal of Psychopharmacology)
- Davies J, Read J 2019 — A systematic review into the incidence, severity and duration of antidepressant withdrawal effects (Addictive Behaviors)
Clinical guidelines
Evidence-based deprescribing and prescribing standards.
Deprescribing-specific resources
Clinician-facing references on tapering protocols.
- Royal College of Psychiatrists — Antipsychotics — UK clinical guidance on antipsychotic prescribing and discontinuation
- Council for Evidence-Based Psychiatry (CEP UK) — Evidence-based critique of long-term antipsychotic prescribing
- Deprescribing.org — Antipsychotic deprescribing algorithm for insomnia and BPSD
Patient-advocacy & lived-experience
Long-running communities documenting withdrawal experience.
- Surviving Antidepressants — antipsychotic tapering forum — Community archive of antipsychotic taper experiences
- Mad in America — antipsychotic archive — Independent journalism on antipsychotics and withdrawal
- Inner Compass Initiative — Withdrawal Project — Peer-led psychiatric drug withdrawal resources
- RxISK — adverse drug reaction reporting — Independent database of antipsychotic adverse-effect reports
TaperCommunity does not provide medical advice. Always consult a qualified prescriber before adjusting psychiatric medication.