Tirzepatide vs. semaglutide: how they compare for weight loss
How tirzepatide and semaglutide work, what head-to-head research shows, side effects, cost and how to choose with your clinician.
Tirzepatide is never started at a full dose. Your dose goes up in small steps over several months, which gives your body time to adjust and keeps side effects manageable. This tirzepatide dosage schedule shows the standard step-up, what each month usually feels like, and what to do if you miss a dose.
Your own schedule is set by your clinician and may move faster or slower depending on how you respond.
The standard tirzepatide dosage schedule
The FDA-approved label for Zepbound® (brand-name tirzepatide) sets out this schedule for weight management:
| Weeks | Weekly dose | Why |
|---|---|---|
| 1–4 | 2.5 mg | Starting dose to let your body adjust. Not a maintenance dose. |
| 5–8 | 5 mg | First dose that can be used for maintenance. |
| 9–12 | 7.5 mg | Raised only if you need it and you're tolerating 5 mg. |
| 13–16 | 10 mg | Second maintenance option. |
| 17–20 | 12.5 mg | Step toward the highest dose. |
| 21+ | 15 mg | Highest dose allowed. |
The label recommends a maintenance dose of 5 mg, 10 mg or 15 mg once a week. Each increase is 2.5 mg, and you stay on each dose for at least four weeks before moving up. Many people never need 15 mg. If a lower dose is working and you feel well, staying there is common.
Month by month: what to expect
Month 1: 2.5 mg
The first month is about getting used to the medicine, not big results. Many people notice they feel full sooner and think about food less. Mild nausea, burping or constipation are common in the first few weeks. Eating smaller meals and drinking enough water help.
Month 2: 5 mg
This is often when appetite changes become obvious and the scale starts to move steadily. Side effects can come back for a few days after the increase, then settle again.
Months 3–5: 7.5 mg to 12.5 mg
Your clinician raises your dose only if you need more help with appetite and weight, and only if you're tolerating your current dose. If side effects are hard to live with, it's normal to stay at a dose for longer, or to step back.
Month 6 and beyond: your maintenance dose
By now most people have found the dose that works for them. In the SURMOUNT-1 trial, adults on tirzepatide lost an average of 15% (5 mg), 19.5% (10 mg) and 20.9% (15 mg) of their body weight over 72 weeks, alongside diet and activity changes, compared with 3.1% on placebo. Those are averages for brand-name tirzepatide; individual results vary, and compounded versions weren't studied in that trial. See our weight-loss timeline for more on what to expect.
How to take your weekly dose
- Same day every week. Pick a day that's easy to remember. You can change the day if you need to, as long as there are at least 3 days (72 hours) between two doses.
- Rotate where you inject. Use your stomach, thigh or the back of your upper arm (with help), and use a different spot each week.
- Measure in milligrams, not just "units." If your medicine comes in a vial, your pharmacy's instructions should tell you exactly how much to draw up. The FDA has reported hospital visits from people measuring compounded doses wrong. If anything is unclear, ask your care team before you inject.
What if you miss a dose?
According to the Zepbound label, if you miss a dose, take it as soon as you remember, within 4 days (96 hours). If more than 4 days have passed, skip it and take your next dose on your usual day. Never take two doses to catch up. If you miss two or more weeks, check with your clinician before restarting, because you may need to go back to a lower dose.
When to call your clinician
Contact your care team, or get urgent care, if you have:
- severe stomach pain that doesn't go away, with or without vomiting (possible pancreatitis);
- pain in the upper right belly, fever or yellowing skin or eyes (possible gallbladder problems);
- signs of dehydration, such as dizziness or very little urine, after repeated vomiting or diarrhea;
- a lump or swelling in your neck, trouble swallowing or a hoarse voice that won't go away.
Our side-effects guide covers what's normal and what isn't in more detail.
The bottom line
Tirzepatide works best when you go slow. Start at 2.5 mg, move up 2.5 mg at a time, give each dose at least four weeks, and stop at the lowest dose that does the job. With a clinician adjusting your plan along the way, most people find a dose that works and side effects they can manage.
At Rovymi, your clinician adjusts your dose at regular check-ins at no extra cost. Tirzepatide + B12 starts at $179 a month on a 6-month plan.
Sources
This article is for general information and isn’t medical advice. See our Important Safety Information.
