Quick answer: In the model, skipping one weekly dose of Tirzepatide lets your level fall 62% below your usual low before your next dose. Levels are back within 10% of the on-schedule curve about 2 weeks after the missed dose (about 1 week after you restart). A dose 1 day late barely moves the curve: the dip is 13% below the usual low.
What happens if you skip a week of Tirzepatide?
Tirzepatide has a half-life of about 5 days, so each weekly dose is still partly in your system when the next one lands. Doses stack until they level off at a plateau. Skip one and that dose's share is simply missing: your level keeps falling past its usual low until your next dose, and the peaks after you restart run lower until the missing dose would have cleared anyway.
Nothing resets. The doses before the miss are still clearing, so you do not rebuild from zero. A single skipped week costs one dose's worth of drug, and that deficit fades on the same half-life clock as everything else, which is why recovery takes weeks rather than months.
Taking Tirzepatide late instead of skipping
A late dose moves that dose's curve instead of removing it. The sooner you take it, the smaller the dip before it. But the late dose then lands closer to your next scheduled one, so the two overlap and the next peak runs higher than usual. In the table above, a dose 1 day late puts the next peak 4% above usual; at 6 days late it is 32% above usual. This tool models the late dose followed by your next dose on your usual day.
What the label says
The Zepbound prescribing information (tirzepatide, the same molecule) says:
"If a dose is missed, instruct patients to administer ZEPBOUND as soon as possible within 4 days (96 hours) after the missed dose. If more than 4 days have passed, skip the missed dose and administer the next dose on the regularly scheduled day."
Source: ZEPBOUND (tirzepatide) Full Prescribing Information, Eli Lilly, section 2.4. The table's Zepbound column shows where each late dose falls against that 4-day (96-hour) window.
Frequently asked questions
What happens if I skip a week of Tirzepatide?
In the model, skipping one weekly dose of Tirzepatide lets your level fall 62% below your usual low before your next dose, and the first peak after you restart runs 25% below your usual peak. Levels are back within 10% of your on-schedule curve about 2 weeks after the missed dose. Enter your own dose and week above to see your curve.
Can I take Tirzepatide a day late?
The Zepbound prescribing information (tirzepatide, the same molecule) says: "If a dose is missed, instruct patients to administer ZEPBOUND as soon as possible within 4 days (96 hours) after the missed dose. If more than 4 days have passed, skip the missed dose and administer the next dose on the regularly scheduled day." In the model, a dose 1 day late lets your level dip 13% below your usual low, puts the next peak 4% above your usual peak, and is back within 10% of your on-schedule curve in 2 days.
Does my dose change how long recovery takes?
No. The model is linear, so the percentage drop and the time to recover are the same at every dose; your dose only sets the mg scale on the chart. What changes the answer is whether you skipped the dose or took it late, and how late.
How is this calculated?
A one-compartment model with first-order absorption, the same model as the GLP3 Planner half-life calculator. For Tirzepatide: half-life about 5 days, time to peak 1 day, and 80% bioavailability. Every dose's curve is added together, and the skipped or late dose is compared with the same schedule taken on time.
The full methodology lists every model parameter and its source.
Safety: Tirzepatide is the active ingredient in FDA-approved GLP-1 medications. This tool is educational only. It models population-average drug levels, not your own, and it does not tell you whether to take, skip, or double a dose. For a missed dose, follow your prescriber's or pharmacist's instructions.