Introduction to antidepressant taper shapes
This antidepressant taper schedule calculator turns a current daily dose, a goal dose, a duration, and an adjustment interval into a draft sequence of dose changes. It compares a linear schedule, which changes by the same number of milligrams each time, with a proportional schedule, which changes by the same percentage of the dose that remains.
The result is an arithmetic illustration rather than a prescription. Antidepressants differ in half-life, formulation, active metabolites, and withdrawal profile, while people differ in treatment history and sensitivity to dose changes. A licensed prescriber who knows the medication and the person must decide whether tapering is appropriate, how slowly to proceed, and when to pause or revise a plan.
The distinction between milligrams and percentages matters most near the lower end of a taper. Removing 5 mg from 40 mg is a 12.5% reduction, but removing 5 mg from 10 mg is a 50% reduction. A schedule can therefore look smooth on a milligram chart while becoming progressively more abrupt as a fraction of the remaining dose.
How to use the antidepressant dose planner
Enter the dose currently taken each day and the intended goal dose in milligrams. The goal may be a lower maintenance dose or zero, but entering zero does not establish a medically suitable stopping point. Next, enter the total taper window in weeks and the number of days between changes. Weekly changes use an interval of 7 days; an interval of 14 represents changes every two weeks.
Select the taper shape and generate the schedule. Review the number of steps, each proposed dose, the absolute milligram change, and the percentage change from the previous dose. The comparison chart draws both shapes, even when only one is selected for the table. Bring the draft to a prescriber or pharmacist so it can be reconciled with available tablet strengths, liquid concentrations, and formulation instructions.
The step-count and dose formulas
Let S be the starting dose in milligrams, F the goal dose, W the duration in weeks, D the interval in days, and N the number of whole dose-change intervals. The calculator counts only complete intervals that fit into the selected window:
A linear taper divides the total milligram difference equally among those steps:
A proportional taper instead uses a constant multiplier. For a nonzero goal dose, the multiplier is the N-th root of the goal-to-start ratio:
The dose at step k is S multiplied by r to the power k. Because repeated multiplication by a positive ratio never equals zero, a proportional plan with a zero goal needs a separately chosen final jump. For illustration, this calculator approaches 1% of the starting dose before displaying zero as a distinct final step. That convention is not a recommendation about when to stop.
Why low-dose changes can look different
Research using positron emission tomography suggests that serotonin-transporter occupancy for several SSRIs follows a saturating rather than linear relationship with dose. One simplified teaching model is:
Here, d is dose and ED₅₀ is the modelled dose associated with half-maximal occupancy. The curve rises quickly at low doses and flattens at higher doses. Consequently, the same milligram reduction may correspond to a larger modelled occupancy change near zero. Occupancy is not the same as clinical benefit, withdrawal severity, or an individual treatment response, so the equation should be read as an explanatory model only.
Worked example: 40 mg to 10 mg over 12 weeks
Suppose a person and prescriber are discussing a reduction from 40 mg to 10 mg over 12 weeks, with changes every 7 days. The 84-day window contains 12 complete weekly intervals. A linear schedule divides the 30 mg difference by 12, producing a reduction of 2.5 mg per step.
The linear sequence begins 40, 37.5, 35, and 32.5 mg before eventually reaching 10 mg. Although every cut is 2.5 mg, the first cut is 6.25% of 40 mg and the final cut is 20% of 12.5 mg. The proportional alternative uses a multiplier of approximately 0.8909, or a reduction of about 10.91% at each step. Its milligram cuts start larger and become smaller as the dose falls.
| Comparison | Linear | Proportional |
|---|
| Change rule | 2.5 mg each step | About 10.91% each step |
|---|
| First reduction | 40 to 37.5 mg | 40 to about 35.64 mg |
|---|
| Final reduction | 12.5 to 10 mg | About 11.22 to 10 mg |
|---|
Neither sequence accounts for whether those exact doses can be dispensed. Some tablets may be safely split, some must remain intact, and some schedules require a manufacturer-supplied liquid or a compounded preparation. A pharmacist should confirm what is practical and safe for the specific product.
Interpreting and monitoring an antidepressant taper
A generated row means only that the arithmetic places a dose change on that day. It does not mean symptoms will appear immediately or resolve by the next row. During a clinician-supervised taper, it can be useful to record mood, anxiety, sleep, dizziness, nausea, sensory disturbances, concentration, energy, and any return of the condition being treated.
If symptoms become troublesome, a prescriber may recommend holding the current dose longer, returning to a previously tolerated dose, making smaller changes, or revising the overall objective. Withdrawal symptoms and recurrence of depression or anxiety can overlap, which is another reason not to diagnose the cause from a calculator schedule alone.
Limitations and safety assumptions for this taper estimate
The calculation assumes equal time between dose changes and perfect mathematical doses. It does not model medication half-life, blood concentration, missed doses, alternate-day dosing, active metabolites, other medicines, pregnancy, liver or kidney function, substance use, or coexisting health conditions. It also does not determine whether a linear or proportional approach is clinically preferable.
Do not crush, open, dissolve, or split a controlled-release or extended-release product unless a pharmacist has confirmed that the exact formulation can be altered. Do not use alternating-day dosing merely to imitate an average daily dose unless a prescriber specifically directs it, because fluctuating exposure can be important for some medicines.
If depression suddenly worsens, thoughts of self-harm or suicide occur, or there is severe agitation, confusion, mania, or another alarming change, seek urgent help. In the United States, call or text the 988 Suicide & Crisis Lifeline. Elsewhere, contact the local emergency number or crisis service.
Questions about antidepressant dose reduction
How slowly should I taper?
There is no single correct speed. Some people use weeks, while others need months or longer, particularly after long treatment or previous withdrawal difficulty. The pace should be chosen and adjusted with a prescriber.
What does a proportional taper change?
It keeps the percentage reduction approximately constant, so the absolute milligram cuts shrink with the remaining dose. This avoids the steadily increasing percentage cuts produced by a fixed-milligram sequence.
Can I stop as soon as the calculated dose is small?
No calculator can identify a suitable jump-off dose for an individual. The final dose depends on the medicine, formulation, response, and clinical plan.
Sources for antidepressant taper discussions
Safety first: this calculator and its optional game are educational. Do not start, stop, or change an antidepressant without a licensed clinician.
Enter your doses, duration, and interval, then press Generate schedule.