ProvaFacts on this page come from FDA labels and official sources, listed at the end. It's general information, not medical advice: your prescriber comes first.
Zepbound starts at 2.5 mg once a week for 4 weeks, then goes to 5 mg. From there the dose can go up by 2.5 mg, after at least 4 weeks on the current one, to a maximum of 15 mg a week. That's the whole ladder in the FDA label, and which rung you stop on is your prescriber's call.
The dose steps
| Weekly dose | What the label says about it | Earliest week it can start |
|---|---|---|
| 2.5 mg | Starting dose for every indication. "Not approved as a maintenance dosage." | Week 1 |
| 5 mg | The step after the first 4 weeks. A maintenance dose for weight reduction. | Week 5 |
| 7.5 mg | Step up, at least 4 weeks after 5 mg. | Week 9 |
| 10 mg | Maintenance dose for weight reduction and for sleep apnea. | Week 13 |
| 12.5 mg | Step up, at least 4 weeks after 10 mg. | Week 17 |
| 15 mg | Maximum dose for all indications. Maintenance dose for weight reduction and for sleep apnea. | Week 21 |
The last column is just arithmetic: it's where you'd land if every increase came at the 4-week minimum. Nothing in the label makes the increase automatic. It says the dose "may be increased" and asks prescribers to "consider treatment response and tolerability when selecting the maintenance dosage. If patients do not tolerate a maintenance dosage, consider a lower maintenance dosage." So a slower chart, or one that stops at 5 mg, still follows the label.
The label gives one reason for the slow climb: the escalation is there "to reduce the risk of gastrointestinal adverse reactions." Nausea, diarrhea, vomiting and constipation are the first four on its list of common side effects.
Weight loss vs. sleep apnea
Zepbound has two approved uses in adults. Both start at 2.5 mg and climb the same steps; only the maintenance dose differs.
For weight reduction and keeping it off long term, the label lists 5 mg, 10 mg or 15 mg once weekly. For moderate to severe obstructive sleep apnea in adults with obesity, it lists 10 mg or 15 mg once weekly.
Pens, vials and the KwikPen
Every dose comes in four presentations. The milligrams per shot match, but the volume can differ, so check it if you switch.
| Dose | Single-dose pen or vial | Multi-dose vial (4 doses) | KwikPen (4 doses) |
|---|---|---|---|
| 2.5 mg | 0.5 mL | 0.6 mL per dose, 10 mg/2.4 mL | 10 mg/2.4 mL |
| 5 mg | 0.5 mL | 0.6 mL per dose, 20 mg/2.4 mL | 20 mg/2.4 mL |
| 7.5 mg | 0.5 mL | 0.6 mL per dose, 30 mg/2.4 mL | 30 mg/2.4 mL |
| 10 mg | 0.5 mL | 0.6 mL per dose, 40 mg/2.4 mL | 40 mg/2.4 mL |
| 12.5 mg | 0.5 mL | 0.6 mL per dose, 50 mg/2.4 mL | 50 mg/2.4 mL |
| 15 mg | 0.5 mL | 0.6 mL per dose, 60 mg/2.4 mL | 60 mg/2.4 mL |
Each multi-dose vial and each KwikPen holds 2.4 mL and comes in one strength: a 5 mg KwikPen gives four 5 mg doses. The concentration climbs with the strength, from 4.17 mg/mL in the 2.5 mg version to 25 mg/mL in the 15 mg one.
If you're searching for the chart "in units" or "in mL" because you use a vial: the label measures vial doses in mL only, and asks for "a syringe appropriate for dose administration (e.g., a 1 mL syringe capable of measuring a 0.5 mL or 0.6 mL dose)," with a new syringe and needle for each injection. Whether your dose is 0.5 or 0.6 mL depends on which vial you have, so check the carton and ask your pharmacist how to read your syringe.
Two more label rules for the KwikPen: never share one between people, "even if the pen needle is changed," and it's "not recommended for self-administration by those who are visually impaired." For how many clicks a dose takes and how to prime it, the KwikPen has its own Instructions for Use. If your presentation changes, the label calls for training on the new one.
Missed dose and changing shot day
On a missed dose, the dosing section 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."
On moving shot day: "The day of weekly administration can be changed, if necessary, as long as the time between the two doses is at least 3 days (72 hours)." If you're unsure how that applies to your week, ask your prescriber or pharmacist. The GLP-1 medication level calculator draws an estimate of your level between shots from the label's half-life. And if you'd rather keep your steps on paper, the printable shot log has a column for the dose.
The rest of shot day, per the label
Once a week, any time of day, with or without meals. The label lists the abdomen and the thigh for the shot, and the back of the upper arm when someone else gives it, with a new site each time. The liquid should look "clear and colorless to slightly yellow"; the label says not to use it if you see particles or discoloration.
One more thing the label flags at every step up: Zepbound can make oral birth control work less well. It advises people using oral contraceptives "to switch to a non-oral contraceptive method, or add a barrier method of contraception for 4 weeks after initiation and for 4 weeks after each dose escalation." Your prescriber can go over it with you.
Sources
- Zepbound (tirzepatide) prescribing information, Eli Lilly, revised 08/2026Checked October 27, 2026
- Zepbound label, DailyMed (National Library of Medicine)Checked October 27, 2026