# Switching From Semaglutide to Tirzepatide (or Vice Versa)

> Semaglutide (Wegovy, Ozempic) and tirzepatide (Zepbound, Mounjaro) are different drugs, and there is no official dose conversion chart between them. Most people start the new medicine at its lowest dose — 2.5 mg for tirzepatide, 0.25 mg for semaglutide — and step up every 4 weeks. No washout is needed: take the first dose of the new medicine on the day your next dose of the old one was due, and never take both in the same week.

![Illustration of two medication vials, one with a green label and one with a cream label, joined by a curved orange line.](https://tryimbue.com/images/learn/switching-semaglutide-tirzepatide-hero.jpg)

Canonical: https://tryimbue.com/learn/switching-semaglutide-to-tirzepatide
Last clinically reviewed: 2026-09-24 by Dr. Prajeet Reddy, MD (Medical Director, Cyane Medical Group California PC)

If your prescriber is moving you between semaglutide and tirzepatide — for better results, side effects, insurance, or supply — here's what changes and what doesn't.

| Medicine | Brand for weight management | Brand for type 2 diabetes | Works on |
|---|---|---|---|
| **Semaglutide** | Wegovy | Ozempic | One gut-hormone receptor (GLP-1) |
| **Tirzepatide** | Zepbound | Mounjaro | Two gut-hormone receptors (GLP-1 and GIP) |

Always follow the specific plan your prescriber and pharmacist give you. This guide explains the general rules.

## Why the Doses Don't Convert

The milligram numbers on these two medicines **don't match up**. They are different drugs acting on different receptors, so there is **no official conversion chart** saying "this dose of one equals that dose of the other."[[1]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d2d7da5d-ad07-4228-955f-cf7e355c8cc0)[[6]](https://onlinelibrary.wiley.com/doi/10.1111/ijcp.13731)

That's why most people **start the new medicine at its lowest dose and build up slowly**, even after reaching a high dose of the old one. This is deliberate: gradual step-ups are the main way stomach side effects stay manageable. Your prescriber may choose a different starting dose based on how you did on the old medicine.[[6]](https://onlinelibrary.wiley.com/doi/10.1111/ijcp.13731)

## How Each Medicine Is Dosed

Both are **once-weekly injections** under the skin of the abdomen, thigh, or upper arm, on the same day each week, with or without food.

| Medicine | Starting dose | Step-ups (about every 4 weeks) | Maximum |
|---|---|---|---|
| **Wegovy** (semaglutide) | 0.25 mg | 0.25 → 0.5 → 1 → 1.7 → 2.4 mg | 2.4 mg usual maintenance; 7.2 mg for some adults |
| **Ozempic** (semaglutide) | 0.25 mg | 0.25 → 0.5 → 1 → 2 mg | 2 mg |
| **Zepbound / Mounjaro** (tirzepatide) | 2.5 mg | 2.5 → 5 → 7.5 → 10 → 12.5 → 15 mg | 15 mg |

Wegovy's usual maintenance dose is 2.4 mg; a higher 7.2 mg dose was FDA-approved in March 2026 for some adults with obesity.[[3]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b)[[4]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=adec4fd2-6858-4c99-91d4-531f5f2a2d79)[[11]](https://pubmed.ncbi.nlm.nih.gov/41931277/) Tirzepatide rises by 2.5 mg at each step.[[2]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=487cd7e7-434c-4925-99fa-aa80b1cc776b) Your prescriber may move faster or slower depending on how you feel. Full schedules: [Wegovy](/learn/wegovy-dosage-schedule) and [Zepbound](/learn/zepbound-dosage-schedule).

## How the Doses Roughly Compare

These comparisons come from research studies, **not** an official conversion chart:

- **Blood sugar (type 2 diabetes):** tirzepatide 5 mg lowers blood sugar about as much as semaglutide 2 mg; tirzepatide 10 mg and 15 mg tend to work somewhat better.[[7]](https://pubmed.ncbi.nlm.nih.gov/38613667)[[8]](https://pubmed.ncbi.nlm.nih.gov/35589616/)
- **Weight loss:** tirzepatide generally produces more weight loss than semaglutide. In the head-to-head SURMOUNT-5 trial, people on the highest tolerated tirzepatide dose lost about **20%** of their body weight over 72 weeks, versus about **14%** on semaglutide.[[5]](https://www.nejm.org/doi/full/10.1056/NEJMoa2416394)

**What this means for you:**

- **Switching to tirzepatide** often brings additional weight loss or better blood sugar over time.
- **Switching to semaglutide** — for insurance, supply, side effects, or your prescriber's judgment — may mean even the highest semaglutide dose doesn't fully match the weight loss you had on higher-dose tirzepatide. Ask what to expect.

## Timing Your Switch

- **No washout gap is needed.** Take your **first dose of the new medicine on the day your next dose of the old one was due** — one week after your last injection.[[6]](https://onlinelibrary.wiley.com/doi/10.1111/ijcp.13731)
- **Never take both medicines in the same week.** They should not be used together.
- **If you've gone more than 4–5 weeks without any dose** (for example, during a supply gap), tell your prescriber before restarting — you may need to begin at a lower dose to avoid stomach upset.

## Side Effects During the Switch

The most common side effects of both medicines involve the stomach and gut: **nausea, diarrhea, vomiting, constipation, and stomach discomfort.** They're usually mild to moderate, show up most in the first weeks and after each dose increase, and tend to improve as your body adjusts.[[9]](https://jamanetwork.com/journals/jama/fullarticle/10.1001/jama.2025.11153)

**Tolerating one medicine well doesn't mean you'll tolerate the other the same way.** They aren't identical drugs; some people have more side effects after switching, some fewer.[[10]](https://books.pcimed.com/pdfs/download/obesity)

What helps:

- Eat smaller portions and stop when you feel full
- Choose lower-fat, blander foods when you feel nauseated
- Drink fluids steadily, especially if you have vomiting or diarrhea

More practical tips: [managing nausea on GLP-1s](/learn/how-to-manage-nausea-on-glp1-medications).

## If You Also Take Diabetes Medicines

If you use **insulin** or a **sulfonylurea** (such as glipizide or glimepiride), your risk of **low blood sugar** can go up after a switch — especially a switch to tirzepatide. Your prescriber may lower those doses. Learn the signs (shakiness, sweating, confusion, fast heartbeat), know how to treat a low, and check your blood sugar as directed.[[1]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d2d7da5d-ad07-4228-955f-cf7e355c8cc0)[[4]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=adec4fd2-6858-4c99-91d4-531f5f2a2d79) More: [GLP-1s and low blood sugar](/learn/glp1s-and-low-blood-sugar).

## If You Miss a Dose on Your New Medicine

The rules differ by brand, so check which one you're on:

| Medicine | If you miss a dose |
|---|---|
| **Zepbound / Mounjaro** | Take it within **4 days (96 hours)**. Past that, skip it and take the next dose on your regular day.[[2]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=487cd7e7-434c-4925-99fa-aa80b1cc776b) |
| **Wegovy** | Take it if your next dose is **more than 2 days (48 hours) away**; otherwise skip it.[[3]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b) |
| **Ozempic** | Take it within **5 days**. Past that, skip it and take the next dose on your regular day.[[4]](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=adec4fd2-6858-4c99-91d4-531f5f2a2d79) |

**Never take two doses close together to catch up.** Full rules for every GLP-1: [missed GLP-1 dose](/learn/missed-glp1-dose).

## When to Call Your Prescriber

Call your prescriber or seek care if you have:

- Severe or constant stomach pain, especially spreading to your back — possible [pancreatitis](/learn/pancreatitis-and-glp1s) or [gallbladder trouble](/learn/gallbladder-problems-on-glp1s)
- Vomiting or diarrhea that won't stop, or signs of dehydration
- Signs of a serious allergic reaction — swelling of the face, lips, or throat; trouble breathing; rash
- Low blood sugar that is severe or keeps happening
- Vision changes
- Any new symptom that worries you

## The Short Version

Semaglutide and tirzepatide doses don't convert one-to-one, so expect to restart low and build up slowly. Start the new medicine on the day your old one was next due, and never overlap the two. Stomach side effects may return during the switch and usually ease with time. Keep your follow-up visits so your dose can be adjusted safely.

## Frequently asked questions

### Is there a dose conversion chart from Wegovy to Zepbound?

No. Semaglutide and tirzepatide are different drugs — tirzepatide acts on two gut-hormone receptors (GLP-1 and GIP), semaglutide on one — so the milligram numbers don't line up and no official conversion chart exists. Most people start the new medicine at its lowest dose and step up every 4 weeks, even if they were on a high dose of the old one. Your prescriber may choose a different starting point based on how you tolerated the old medicine.

### Do I need a break between stopping semaglutide and starting tirzepatide?

No washout is needed. Take your first dose of the new medicine on the day your next dose of the old one would have been due — one week after your last injection. Never take both medicines in the same week. If you've gone more than 4–5 weeks without any dose, tell your prescriber: you may need to restart lower to avoid stomach upset.

### Will I lose more weight after switching from Wegovy to Zepbound?

Many people do. In the head-to-head SURMOUNT-5 trial, people on the highest tolerated dose of tirzepatide lost about 20% of their body weight over 72 weeks, versus about 14% on semaglutide. Results vary from person to person, and switching in the other direction — from Zepbound to Wegovy — may mean the new medicine doesn't fully match your earlier weight loss.

### Will the side effects come back when I switch?

They may. Nausea, diarrhea, constipation and stomach discomfort are most common in the first weeks and after each dose increase, so a switch that restarts you at a low dose can bring some of them back. Tolerating one medicine well doesn't mean you'll tolerate the other the same way — they aren't identical drugs. Most side effects ease as your body adjusts.