Want a full personalised taper protocol?

This page shows a quick schedule for this drug. For the guided path — pre-taper risk quiz, formulation-aware steps, and email delivery — start from the main calculator.

Effexor (Venlafaxine) Tapering Guide

Effexor (venlafaxine) is an SNRI antidepressant, marketed as Effexor in the US and Efexor in the UK. It is commonly used for depression and anxiety when an SNRI is appropriate. This guide and medication taper calculator help you plan how to wean off Effexor safely with your prescriber.

Dosage

Venlafaxine comes as immediate-release tablets (for example 25 mg, often scored) and extended-release capsules or tablets (commonly 37.5 mg and 75 mg). XR products should not be crushed; small doses may need IR tablets, bead counting from XR capsules (with guidance), or a compounded liquid.

Venlafaxine has a very short half-life and one of the highest withdrawal-severity ratings of common antidepressants, so hyperbolic steps with longer holds are especially important.

Venlafaxine taper schedule

Choose a common starting dose to preview the full hyperbolic schedule — free, no email required. This schedule has 42 steps and takes about 164 weeks in total; your prescriber may adjust the pace based on how you feel.

Starting dose

Selected start: 150 mg/day · 1× daily
Taper speed: Slow
Region (formulations): US; Tablet/liquid products used for dosing tips — not your location. Example uses US formulary; change region in the custom builder.
Modelled occupancy at start: ~78.7%

Swipe sideways to see every column.

Step	Daily (mg)	How to take it	Per dose × 1/day	Hold (weeks)
0	150	Your current dose — hold steady before step 1.	150 mg × 1	—
1	100	Take 4 × 25 mg IR tablet tablets (100 mg active ingredient total).	100 mg × 1	4
2	75	Take 3 × 25 mg IR tablet tablets (75 mg active ingredient total).	75 mg × 1	4
3	62.5	Take 2 whole 25 mg tablets + half of a scored 25 mg tablet (12.5 mg) ≈ 62.5 mg active ingredient.	62.5 mg × 1	4
4	50	Take 2 × 25 mg IR tablet tablets (50 mg active ingredient total).	50 mg × 1	4
5	44.82	GPSee liquid / compounding note below	44.82 mg × 1	4
6	37.5	Take 1 whole 25 mg tablet + half of a scored 25 mg tablet (12.5 mg) ≈ 37.5 mg active ingredient.	37.5 mg × 1	4
7	34.14	GPSee liquid / compounding note below	34.14 mg × 1	4
8	25	Take 1 × 25 mg IR tablet tablet (25 mg active ingredient total).	25 mg × 1	4
9	23.1	GPSee liquid / compounding note below	23.1 mg × 1	4
10	21.4	GPSee liquid / compounding note below	21.4 mg × 1	4
11	19.85	GPSee liquid / compounding note below	19.85 mg × 1	4
12	18.4	GPSee liquid / compounding note below	18.4 mg × 1	4
13	17.1	GPSee liquid / compounding note below	17.1 mg × 1	4
14	15.9	GPSee liquid / compounding note below	15.9 mg × 1	4
15	14.8	GPSee liquid / compounding note below	14.8 mg × 1	4
16	13.8	GPSee liquid / compounding note below	13.8 mg × 1	4
17	12.85	GPSee liquid / compounding note below	12.85 mg × 1	4
18	11.95	GPSee liquid / compounding note below	11.95 mg × 1	4
19	11.15	GPSee liquid / compounding note below	11.15 mg × 1	4
20	10.4	GPSee liquid / compounding note below	10.4 mg × 1	4
21	9.7	GPSee liquid / compounding note below	9.7 mg × 1	4
22	9.05	GPSee liquid / compounding note below	9.05 mg × 1	4
23	8.4	GPSee liquid / compounding note below	8.4 mg × 1	4
24	7.8	GPSee liquid / compounding note below	7.8 mg × 1	4
25	7.25	GPSee liquid / compounding note below	7.25 mg × 1	4
26	6.7	GPSee liquid / compounding note below	6.7 mg × 1	4
27	6.2	GPSee liquid / compounding note below	6.2 mg × 1	4
28	5.75	GPSee liquid / compounding note below	5.75 mg × 1	4
29	5.3	GPSee liquid / compounding note below	5.3 mg × 1	4
30	4.85	GPSee liquid / compounding note below	4.85 mg × 1	4
31	4.45	GPSee liquid / compounding note below	4.45 mg × 1	4
32	4.05	GPSee liquid / compounding note below	4.05 mg × 1	4
33	3.7	GPSee liquid / compounding note below	3.7 mg × 1	4
34	3.35	GPSee liquid / compounding note below	3.35 mg × 1	4
35	3	GPSee liquid / compounding note below	3 mg × 1	4
36	2.7	GPSee liquid / compounding note below	2.7 mg × 1	4
37	2.4	GPSee liquid / compounding note below	2.4 mg × 1	4
38	2.1	GPSee liquid / compounding note below	2.1 mg × 1	4
39	1.8	GPSee liquid / compounding note below	1.8 mg × 1	4
40	1.55	GPSee liquid / compounding note below	1.55 mg × 1	4
41	1.5	GPSee liquid / compounding note below	1.5 mg × 1	4

Rows highlighted: larger occupancy drop than target — consider smaller steps or longer holds. If symptoms are intolerable, return to the previous dose and talk to your prescriber.

Steps that cannot be made from whole or half licensed tablets point to the liquid / compounding note below — ask your prescriber before changing how you take your dose.

Want a copy to keep?

The full venlafaxine schedule is already shown below. Enter your email to also receive a PDF and HTML copy you can save or share with your prescriber — optional, and we never gate the schedule behind it.

It's not a substitute for medical advice. This calculator can help you visualise a tapering schedule but before making any changes to your medication plan it's necessary to consult a medical professional. Ask a psychiatrist — available after you request your protocol.

Dose vs occupancy

This taper is spread across 42 gradual steps. The curve below shows why the last few milligrams matter most: at low doses, small dose changes produce large drops in serotonin-transporter occupancy.

What this shows: the non-linear relationship between dose and serotonin transporter (SERT) occupancy. The curve is flat at high doses — most transporters are already blocked, so a dose cut has little biological impact — and much steeper at low doses, where even a 1–2 mg reduction causes a disproportionately large drop in occupancy. Your taper steps are spaced along this curve so each step removes a similar amount of occupancy.

Modelled Hill-curve occupancy — illustrative only. PET-derived parameters vary by study; your prescriber may use different clinical targets. Small mg changes near zero can still produce large occupancy shifts.

How to Taper Off Effexor (Venlafaxine) Safely

How to taper off Effexor (venlafaxine) safely is one of the most searched — and clinically important — deprescribing questions. Venlafaxine has a short parent half-life (~5 hours; O-desmethylvenlafaxine longer) and a steep occupancy curve at low doses, so coming off Effexor usually needs a slow hyperbolic taper schedule, careful timing, and often bead counting or a fluoxetine bridge planned with your clinician.

Effexor XR bead capsules and IR tablets are both used. People trying to wean off Effexor or get off antidepressants after anxiety or depression treatment often hit a wall at 37.5 mg. Evidence-aligned deprescribing favours gradual, occupancy-based cuts (Horowitz & Taylor, 2019; Maudsley Deprescribing Guidelines 2024; NICE NG222).

What coming off Effexor actually feels like, week by week

Missed or late doses of venlafaxine can trigger withdrawal within hours: intense dizziness, brain zaps, nausea, agitation, crying spells, and a sense of electric “whooshing” on eye movement. An oversized taper step feels similar but lasts longer.

A well-paced Effexor taper still often feels bumpier than an SSRI taper. Expect more monitoring in the first 24 hours after each cut. The last capsule strength (commonly 37.5 mg XR) is where most people need the slowest work.

“If I was even a few hours late with a dose, the zaps started. That was the moment I understood why you cannot rush this one.”

— paraphrased from patient forums

“Coming off venlafaxine successfully took me the better part of a year of tiny steps. Every time I tried to hurry, the withdrawal slammed me back.”

— paraphrased from patient forums

Withdrawal or relapse — how to tell them apart

Venlafaxine withdrawal is typically early, physical, and rapidly responsive to reinstatement. Relapse of the original mood or anxiety disorder emerges later, lacks the zap/dizziness signature, and does not clear within a day of putting the dose back (Cosci & Chouinard, 2020).

Effexor taper schedules by starting dose (150, 75, 37.5 mg)

Common XR starting points are 225, 150, 75, and 37.5 mg. Generic “reduce by 10–25%” advice is often too coarse for a drug this reactive; the hyperbolic schedule above is safer. Notes below are high → low.

From 150 mg (and higher): upper steps (for example 150 → 112.5 → 75) are usually tolerable with standard capsule strengths. How to taper off Effexor 150 mg is mostly about not rushing into the hard part below 75 mg.

From 75 mg: steps should shrink. Moving 75 → 56 → 37.5 (or similar occupancy-matched steps) is gentler than jumping straight to the lowest XR capsule.

From 37.5 mg: how to taper off Effexor 37.5 mg is the crux — it is often the lowest common XR strength, so going below needs bead counting, a switch to IR tablets, compounded liquid, or a clinician-supervised fluoxetine bridge.

Build your schedule from your dose →

If it gets worse: pausing and reinstatement

Intolerable symptoms after a cut: hold, reinstate (even a partial return helps many people), or contact your prescriber. With venlafaxine, reinstatement can bring relief within hours because levels fall and rise quickly.

Once stable, resume from the tolerated dose with smaller steps. Missing doses is its own form of abrupt taper — keep timing consistent while you come off Effexor.

Beads, IR tablets, and bridges for small venlafaxine doses

XR capsules can be opened and beads counted under pharmacist guidance to create intermediate doses — do not crush or chew the beads. Some people switch to IR venlafaxine for finer tablet splits at the bottom.

A fluoxetine bridge (cross-taper to fluoxetine, then taper the longer-acting SSRI) is sometimes used when venlafaxine micro-doses remain intolerable; that decision belongs with your prescriber, not a self-directed switch.

The bottom line

Effexor is among the harder antidepressants to stop, but a slow hyperbolic taper — with bead counting, IR options, or a planned bridge — makes coming off venlafaxine achievable. Prioritise the last 37.5 mg and never skip doses during the taper.

Milligram scale guidance (advanced — prescriber/pharmacist approval required)

When a dose is below what you can split from a licensed tablet, some people weigh crushed tablet powder. This is not exact chemistry — it is a last resort. Liquid or compounded formulations are safer when available.

Resolution: at least 0.001 g (1 mg) — not a kitchen scale.
Include a calibration weight and use a draft shield if possible.
Weigh on a stable surface; tare your container first.
Crushed tablet weight ≠ exact active ingredient — drug may not be evenly distributed; prefer liquid or compounded specials when available.
Never split enteric-coated (EC) or extended-release (XR) products — discuss with your pharmacist.

Example searches (confirm specs before buying):

Key facts about hyperbolic antidepressant tapering

The calculator algorithm is based on peer-reviewed research and has been reviewed by our medical advisors to ensure the accuracy of the tapering model.

72%
discontinued their antidepressant using hyperbolic tapering strips in a real-world study
71% of the same people had previously tried to stop at least once and been unsuccessful; the study did not record which method those earlier attempts used. Figures come from tapering-strip research and may not generalise to every taper.
Source: Groot et al., Therapeutic Advances in Psychopharmacology 2021
56 days
median taper length in that tapering-strip study — not a target; many people taper over 6–12 months or longer
This median reflects tapering-strip use in one study. Your timeline depends on how long you have taken the medication, your withdrawal symptoms, and previous attempts — slower is often safer.
Source: Groot et al., Therapeutic Advances in Psychopharmacology 2021
10%
serotonin transporter occupancy per tapering step
This linear reduction prevents withdrawal. Slower, more gradual tapering over several months has shown greater success in reducing withdrawal symptoms than short tapers.
Source: Horowitz et al., The Lancet Psychiatry 2019

Claro — tapering companion

A protocol isn’t enough — you need support.

Tapering can take months, sometimes years. Claro helps you track each step, log symptoms, and spot when a reduction was too fast — with psychiatrist-reviewed guidance. Join early access while we launch the app.

Why an AI companion for tapering? →

Frequently asked questions about venlafaxine

Common questions about how to taper off venlafaxine, hyperbolic schedules, and withdrawal — written for people who want to come off antidepressants safely with their prescriber.

How do you taper off Effexor (venlafaxine)?

Effexor (venlafaxine) is tapered hyperbolically because its short half-life (about 5 hours for the parent drug) makes missed doses and sharp reductions painful. Most clinicians reduce by ~10% of the previous dose every 2-4 weeks, then move to even smaller steps below 37.5 mg/day. Once you cannot split capsules small enough, switching to a liquid or bead-counting approach is standard practice (Maudsley Deprescribing Guidelines, 2024).

Why are Effexor withdrawal brain zaps so bad?

Venlafaxine has a short half-life, so blood levels rise and fall quickly. When the dose drops, serotonin and noradrenaline activity rebounds rapidly, producing "brain zaps" — brief electric-shock sensations, often triggered by eye movement. Brain zaps usually settle within days to weeks after each reduction; if they persist, the dose was reduced too fast (Framer, 2021).

Can I switch from Effexor to Prozac to taper?

Switching from venlafaxine to fluoxetine — the "Prozac bridge" — is sometimes used because fluoxetine has a very long half-life (≈ 4-6 days), which self-tapers when you stop. It is an off-label, prescriber-led decision and not universally recommended; it is best discussed with a psychiatrist before attempting.

How long does Effexor withdrawal last?

After a well-sized reduction, Effexor (venlafaxine) withdrawal symptoms usually appear within a day, peak over 2-4 days, and settle within 1-2 weeks. Because venlafaxine has a very short half-life (~5 hours), symptoms come on fast but also ease quickly once you stabilise. Protracted symptoms in a minority of people can last longer; holding each dose for 2-4 weeks before the next reduction lowers that risk.

Can you stop Effexor cold turkey?

No — stopping Effexor cold turkey is strongly discouraged. Venlafaxine has one of the shortest half-lives of any antidepressant, so abrupt discontinuation commonly triggers intense withdrawal within 24 hours, including brain zaps, dizziness, and nausea. If you have already stopped and feel unwell, contact your prescriber; reinstating your previous dose and then tapering gradually is the standard recommendation.

Can you open Effexor XR capsules to taper?

Effexor XR capsules contain coated beads, and some people open the capsule to remove a measured fraction of beads for small dose reductions ("bead counting"). Do not crush or dissolve the beads. Count the beads in your own capsule rather than assuming a fixed number, recalculate each step from your current dose, and confirm the approach with your prescriber or pharmacist first.

What is an antidepressant tapering calculator?

An antidepressant tapering calculator is a free online medication taper calculator that turns your current dose into a step-by-step plan for reducing it over time. The Claro calculator uses the hyperbolic method: each step removes a similar percentage of receptor occupancy rather than the same number of milligrams. The result is a personalised schedule you can review with your prescriber when you decide to wean off antidepressants.

Why use a tapering calculator?

A medication taper calculator turns receptor-occupancy research into a concrete hyperbolic taper schedule you can read in minutes. It is especially useful when you want to come off antidepressants gradually, because the last few milligrams cause the largest change in modelled occupancy. Use it to preview steps, plan liquid or split-tablet doses, and bring a printable plan when you wean off antidepressants with your prescriber.

How does an antidepressant taper calculator work?

The calculator models how much of your serotonin (or noradrenaline) transporter is occupied at each dose using a Hill-equation curve fitted to published PET studies. It then chooses dose reductions so that each step removes a roughly equal amount of occupancy — the hyperbolic method described by Horowitz and Taylor (2019). The schedule is then rounded to doses you can actually achieve with available tablets, capsules, or liquids in your region.

What is hyperbolic tapering and why is it recommended?

Hyperbolic tapering means reducing your dose by smaller and smaller milligram amounts as you get lower, so the change in receptor occupancy at each step stays about the same. It is recommended because antidepressants follow a hyperbolic dose-response curve: at low doses, small milligram changes have outsized effects. Hyperbolic tapering is endorsed in the Maudsley Deprescribing Guidelines (2024), the UK NICE NG222 guideline, and the Dutch multidisciplinary deprescribing document.

What is the safest way to taper off antidepressants?

The safest way is gradual, supervised, and individualised. Work with a prescriber, hold each dose for at least 2-4 weeks before reducing again, and use liquid or compounded formulations once tablets cannot be split small enough. If symptoms become severe, return to the previous stable dose, allow time to settle, then resume with smaller steps. This calculator is educational; do not change medication without clinical supervision.

How slowly should antidepressants be reduced?

Most people benefit from reductions of around 5-10% of the previous dose every 2-4 weeks, and even more slowly toward the end of the taper. Higher-risk drugs — paroxetine, venlafaxine, and duloxetine — typically need slower steps and longer holds. There is no fixed timeline: many people take 6-12 months to fully get off antidepressants and some take longer, especially after years of treatment.

What are common antidepressant withdrawal symptoms?

The most commonly reported antidepressant withdrawal symptoms include dizziness, "brain zaps" (brief electric-shock sensations), nausea, fatigue, insomnia, vivid dreams, headaches, irritability, anxiety, and mood swings. A 2024 Lancet Psychiatry meta-analysis (Henssler et al.) estimated discontinuation symptoms in around 31% of people, with about 2.8% experiencing severe symptoms. Earlier work (Davies & Read, 2019) reported higher rates of 56% across surveyed populations.

What is the difference between antidepressant withdrawal and relapse?

Withdrawal usually starts within days of a dose reduction, includes physical symptoms like dizziness or brain zaps, and improves when you reinstate the previous dose. Relapse of the original condition typically appears weeks later, is dominated by your original symptoms, and is not relieved within hours by reinstating. The Cosci & Chouinard (2020) framework is the standard taxonomy clinicians use to tell the two apart.

Is it dangerous to stop antidepressants cold turkey?

Stopping antidepressants cold turkey is widely discouraged. Sudden discontinuation increases the risk of severe withdrawal symptoms, including dizziness, brain zaps, and emotional changes, and can trigger reinstatement. Short half-life drugs such as paroxetine and venlafaxine carry the highest risk. If you have already stopped abruptly and feel unwell, contact your prescriber; reinstating the previous dose and then tapering more gradually is the standard recommendation.

Why are the last antidepressant dose reductions often the hardest?

Because the dose-occupancy curve is hyperbolic. At low doses, a 1-2 mg change can produce as much receptor change as a 10-20 mg change at higher doses. This is why people often feel fine for most of the taper and then struggle at the end. A medication taper calculator addresses this by making the final steps in tenths of a milligram, which usually requires a liquid formulation or compounded preparation.

Which antidepressants are hardest to taper off?

Paroxetine (Paxil/Seroxat) and venlafaxine (Effexor) are most often reported as the hardest antidepressants to come off, followed by duloxetine (Cymbalta). They share short half-lives and steep dose-occupancy curves, so missed doses or sharp reductions can trigger withdrawal symptoms within days. Fluoxetine (Prozac), with its very long half-life, is generally the easiest and is sometimes used as a "bridge" when switching off shorter-acting drugs.

Need a different dose or speed?

Use the guided builder to enter your current dose, region, and taper preset — then email your personalised protocol.

Request custom protocol →

Clinical references

[1]Horowitz MA, Taylor D. Tapering of SSRI treatment to mitigate withdrawal symptoms. The Lancet Psychiatry 2019.doi:10.1016/S2215-0366(19)30032-XProposes hyperbolic dose reduction based on receptor-occupancy curves; the methodological basis of every modern taper calculator.
[2]Horowitz MA, Taylor D. The Maudsley Deprescribing Guidelines. Wiley 2024.doi:10.1002/9781394291052Per-drug operational manual for hyperbolic tapering across SSRIs, SNRIs, benzodiazepines, gabapentinoids, and antipsychotics.
[3]Davies J, Read J. A systematic review into the incidence, severity and duration of antidepressant withdrawal effects. Addictive Behaviors 2019.doi:10.1016/j.addbeh.2018.08.027Systematic review: 56% of people who discontinue antidepressants experience withdrawal effects; 46% rate them as severe.
[4]Henssler J et al. Incidence of antidepressant discontinuation symptoms: a systematic review and meta-analysis. The Lancet Psychiatry 2024.doi:10.1016/S2215-0366(24)00133-0Meta-analysis of 79 studies (≈21,000 patients): pooled incidence of discontinuation symptoms ~31%; severe symptoms ~2.8%.
[5]Groot PC, van Os J. Successful use of tapering strips for hyperbolic reduction of antidepressant dose: a cohort study. Therapeutic Advances in Psychopharmacology 2021.doi:10.1177/2045125321103932772% of patients successfully discontinued antidepressants after switching to the hyperbolic model; 71% had previously failed to come off without tapering strips.
[6]Groot PC, van Os J. Antidepressant tapering strips to help people come off medication: real-world outcomes. Therapeutic Advances in Psychopharmacology 2023.doi:10.1177/20451253231171518Of 1,194 patients using hyperbolic taper strips after previous failed attempts, ~71% successfully discontinued their antidepressant.
[7]Framer A. What I have learnt from helping thousands of people taper off antidepressants and other psychotropic medications. Therapeutic Advances in Psychopharmacology 2021.doi:10.1177/2045125321991274Describes the "windows and waves" pattern of withdrawal recovery and supports patient-led pacing.
[8]Hengartner MP et al. Protracted withdrawal syndrome after stopping antidepressants: a descriptive quantitative analysis of consumer narratives. Therapeutic Advances in Psychopharmacology 2020.doi:10.1177/2045125320967183Descriptive analysis of 69 protracted withdrawal cases: median duration 79 weeks; 47% report suicidality during withdrawal.
[9]Cosci F, Chouinard G. Acute and persistent withdrawal syndromes following discontinuation of psychotropic medications. Psychotherapy and Psychosomatics 2020.doi:10.1159/000506868Taxonomy distinguishing new withdrawal symptoms, rebound, and persistent post-withdrawal disorder; the standard framework for withdrawal vs. relapse.
[10]Kalfas M et al. Incidence and Nature of Antidepressant Discontinuation Symptoms. JAMA Psychiatry 2025.doi:10.1001/jamapsychiatry.2025.1362Recent meta-analysis: dizziness was the most common discontinuation symptom in the first 2 weeks after stopping antidepressants, followed by nausea, vertigo, and nervousness.
[11]Gabriel M, Sharma V. Antidepressant discontinuation syndrome. Canadian Medical Association Journal 2017.doi:10.1503/cmaj.160991Clinical review of antidepressant discontinuation syndrome: onset within days of dose reduction, typical symptom course, and management.
[12]Papp A, Onton J. Brain Zaps: An Underappreciated Symptom of Antidepressant Discontinuation. The Primary Care Companion for CNS Disorders 2018.doi:10.4088/pcc.18m02311Characterises "brain zaps" — brief electric-shock sensations — as a common antidepressant discontinuation symptom.
[13]Wang J, Cosci F. Acute and persistent withdrawal syndromes following discontinuation of antidepressants in children and adolescents: a systematic review. Therapeutic Advances in Psychopharmacology 2025.doi:10.1177/20451253251404780Systematic review of acute and persistent antidepressant withdrawal syndromes; reinforces reducing only when stable and under supervision.
[14]Horowitz M, Taylor D. Distinguishing relapse from antidepressant withdrawal: clinical practice and antidepressant discontinuation studies. BJPsych Advances 2022.doi:10.1192/bja.2021.62Frames how clinicians can distinguish antidepressant withdrawal from relapse of the underlying condition.
[15]Sørensen A, Ruhé HG, Munkholm K. The relationship between dose and serotonin transporter occupancy of antidepressants — a systematic review. Molecular Psychiatry 2021.doi:10.1038/s41380-021-01285-wSystematic review of dose–SERT-occupancy relationships across antidepressants; confirms the hyperbolic curve underlying proportional tapering.
[16]Reeve R, Turner JR. Pharmacodynamic models: parameterizing the Hill equation, Michaelis-Menten, the logistic curve, and relationships among these models. Journal of Biopharmaceutical Statistics 2013.doi:10.1080/10543406.2012.756496Explains how the Hill equation, Michaelis-Menten, and logistic models relate — the mathematical basis for the occupancy curve used here.
[17]Preskorn SH. The use of biomarkers in psychiatric research: how serotonin transporter occupancy explains the dose-response curves of SSRIs. Journal of Psychiatric Practice 2012.LinkShows how SERT occupancy explains the non-linear dose–response curves of SSRIs.
[18]Cohrs D, Shapiro B. The relationship between SERT occupancy and extracellular serotonin concentration is hyperbolic, not linear: implications for safely tapering SRI antidepressants. SSRN (preprint) 2026.doi:10.2139/ssrn.6176553Argues the SERT-occupancy to serotonin relationship is itself hyperbolic, reinforcing proportional (hyperbolic) tapering.
[19]Moncrieff J et al. Evidence on antidepressant withdrawal: an appraisal and reanalysis of a recent systematic review. Psychological Medicine 2025.doi:10.1017/S0033291725100652Reappraisal of recent withdrawal-incidence evidence; relevant to how withdrawal rates are interpreted.
[20]Wilson E, Lader M. A review of the management of antidepressant discontinuation symptoms. Therapeutic Advances in Psychopharmacology 2015.doi:10.1177/2045125315612334Practical review of how to manage antidepressant discontinuation symptoms, including tapering and reinstatement.
[21]Groot PC, van Os J. Outcome of antidepressant drug discontinuation with tapering strips after 1–5 years. Therapeutic Advances in Psychopharmacology 2020.doi:10.1177/2045125320954609Long-term follow-up (1–5 years) of patients who discontinued antidepressants using hyperbolic taper strips.
[22]Gury C, Cousin F. Pharmacokinetics of SSRI antidepressants: half-life and clinical applicability. L'Encéphale 1999.LinkHalf-life data for SSRIs — explains why short-half-life drugs (paroxetine, venlafaxine) provoke faster withdrawal.
[23]Mayo Clinic. Antidepressant withdrawal: Is there such a thing?. Mayo Clinic — Expert Answers 2024.LinkPatient-facing explainer on antidepressant discontinuation symptoms and gradual tapering.
[24]NHS Scotland — Right Decision Service. Antidepressants — quality prescribing: difficulty withdrawing from an SSRI/SNRI. NHS Scotland 2024.LinkNHS Scotland guidance on recognising and managing difficulty withdrawing from SSRIs/SNRIs.
[25]The Carlat Psychiatry Report. Clinical pearls for hyperbolic tapering of psychiatric medications in older adults. The Carlat Report 2024.LinkPractical clinical pearls for applying hyperbolic tapering, including in older adults.
[26]Royal College of Psychiatrists. Stopping antidepressants — information for patients and carers. Royal College of Psychiatrists 2024.LinkRCPsych patient-facing guidance on coming off antidepressants safely.
[27]Takano A et al. Serotonin transporter occupancy by venlafaxine in vivo: a [11C]DASB PET study. Psychopharmacology 2006.doi:10.1007/s00213-006-0438-8PET SERT-occupancy curve for venlafaxine — anchors the SNRI hyperbolic curve.
[28]National Institute for Health and Care Excellence (NICE). Depression in adults: treatment and management. NICE guideline [NG222]. NICE 2022.LinkUK national guideline endorsing proportional (hyperbolic) tapering and the use of liquid formulations to enable small final doses.
[29]Royal College of Psychiatrists. Stopping antidepressants — position statement (CR225). Royal College of Psychiatrists 2020.LinkRCPsych acknowledges withdrawal can be severe and long-lasting; recommends slow, individualised tapers.
[30]NHG et al. Multidisciplinary document: Discontinuation of SSRIs and SNRIs (2018; revised 2023). Multidisciplinary Document (Netherlands) 2018.LinkFirst national guideline to explicitly endorse hyperbolic tapering and the use of taper strips (compounded by Regenboog Apotheek).
[31]Medicines and Healthcare products Regulatory Agency (MHRA). Summary of Product Characteristics — SSRI and SNRI products (UK). electronic Medicines Compendium (emc) 2023.LinkAuthoritative UK formulary data (tablet strengths, oral solutions) used to validate the UK region in the calculator.
[32]U.S. Food and Drug Administration. Prescribing information (Structured Product Labeling) for SSRI/SNRI products. FDA / DailyMed 2024.LinkAuthoritative US formulary data (tablet strengths, oral solutions/concentrates) used to validate the US region in the calculator.
[33]Health Canada. Health Canada — Drug Product Database. Health Canada 2024.LinkAuthoritative Canadian formulary data used to validate the Canada region in the calculator.
[34]Therapeutic Goods Administration (TGA). Therapeutic Goods Administration — Australian Register of Therapeutic Goods (ARTG). TGA / ARTG 2024.LinkAuthoritative Australian formulary data used to validate the Australia region in the calculator.
[35]College ter Beoordeling van Geneesmiddelen (CBG-MEB). CBG-MEB — Medicines Information Bank (Netherlands). CBG-MEB 2024.LinkAuthoritative Dutch formulary data; cross-checked with Regenboog Apotheek taper-strip availability.
[36]Regenboog Apotheek, Cinetto. Taperingstrip.com — Regenboog Apotheek. Patient resource (NL) 2024.LinkPioneer of standardised taper strips referenced in the Dutch national guideline.

If you are in crisis or having thoughts of suicide, do not wait for an email response. Find a crisis helpline near you immediately →