How GLP-1 dosing works and why you start on a low dose
The first month on a GLP-1 is not meant to do much. Doses climb every 4 weeks so your stomach can adjust, and knowing the schedule makes those early weeks far less confusing.
GLP-1 medications start at a low dose that is not meant to produce much weight loss, then step up about once every 4 weeks until you reach a maintenance dose. That slow climb, called titration, gives your digestive system time to adjust and is the main way to keep nausea, vomiting and other side effects manageable.
The short version
- Wegovy injection starts at 0.25 mg once a week and increases every 4 weeks through 0.5 mg, 1 mg and 1.7 mg to a maintenance dose of 2.4 mg, with 7.2 mg now approved as an option.
- Zepbound starts at 2.5 mg once a week and can increase by 2.5 mg after at least 4 weeks on each dose, up to 15 mg. Maintenance doses are 5 mg, 10 mg or 15 mg.
- The Wegovy pill steps up monthly from 1.5 mg a day to 25 mg a day.
- The starting doses are for tolerance, not results. Feeling like "nothing is happening" in month one is normal.
- You don't have to keep climbing. Many people stay on a lower dose that works and is tolerable.
The schedules below come from the FDA-approved prescribing information. Your clinician may adjust the pace for you, and that is common. Don't change your dose or schedule without talking to your prescriber.
Why you start low
GLP-1 medications slow the rate at which your stomach empties and act on appetite centers in the brain. Those effects are what reduce hunger, and they are also what cause nausea, fullness, vomiting, diarrhea and constipation. Side effects are most common when you first start and in the days after each dose increase, and they tend to ease as your body adjusts.
Starting at the full dose would put most people through much worse side effects. In the trials, a stepwise schedule over 16 to 20 weeks was used precisely to let people adapt. Even then, gastrointestinal side effects were the most common reason people stopped. Our article on managing GLP-1 side effects has practical advice for those weeks.
Wegovy injection (semaglutide)
Taken once a week, on the same day each week, at any time of day, with or without food.
- Weeks 1 to 4: 0.25 mg
- Weeks 5 to 8: 0.5 mg
- Weeks 9 to 12: 1 mg
- Weeks 13 to 16: 1.7 mg
- Week 17 onward: 2.4 mg maintenance, or 1.7 mg if 2.4 mg isn't tolerated
The FDA approved a 7.2 mg dose, marketed as Wegovy HD, in March 2026, based on the STEP UP trials. It is an option for some adults after time on 2.4 mg, not a starting dose. Higher doses brought more side effects on average.
Zepbound (tirzepatide)
Taken once a week, on the same day each week, with or without food.
- Weeks 1 to 4: 2.5 mg
- Then 5 mg, with increases of 2.5 mg after at least 4 weeks on the current dose
- Available steps: 7.5 mg, 10 mg, 12.5 mg and 15 mg
- Recommended maintenance: 5 mg, 10 mg or 15 mg
Zepbound comes in single-dose pens, single-dose vials and a multi-dose KwikPen. If you use vials, your pharmacist and clinician should show you how to draw up the correct dose; see our guide to giving a subcutaneous injection.
Be careful here
Tirzepatide can make oral birth control pills less effective, especially after starting and after each dose increase. The Zepbound label advises switching to a non-oral method, or adding a barrier method, for 4 weeks after starting and for 4 weeks after each increase. Ask your clinician what applies to you.
Wegovy pill (oral semaglutide)
The FDA approved the Wegovy pill in December 2025. It is taken once a day, first thing in the morning on an empty stomach, with no more than 4 ounces of plain water, then waiting at least 30 minutes before eating, drinking or taking other oral medications. The schedule steps up about every 30 days: 1.5 mg, 4 mg and 9 mg, then 25 mg maintenance. Taking it with food or more water reduces how much is absorbed.
Lilly's daily pill, Foundayo (orforglipron), approved in April 2026, has its own titration schedule and fewer restrictions around food and water. Follow the prescribing information and your prescriber's directions for whichever product you use.
What if side effects are too much?
The labels allow for flexibility. For Wegovy, if a dose increase isn't tolerated, the prescribing information says to consider delaying the next increase for 4 weeks. For Zepbound, the label also allows staying on a dose longer before increasing. A clinician may:
- Keep you on your current dose for another month or more.
- Step back to the previous dose for a while.
- Settle on a lower maintenance dose that works for you.
- Suggest eating changes, covered in our article on what to eat on a GLP-1.
Going up faster than planned rarely helps. It usually means more side effects and does not reliably speed up results.
Missed doses
- Wegovy injection: If you miss a dose and your next scheduled dose is more than 2 days away, take it as soon as you can. If it is less than 2 days away, skip the missed dose and take the next one on schedule. If you miss more than 2 weeks, contact your prescriber; they may restart you at a lower dose.
- Zepbound: Take a missed dose within 4 days (96 hours) of the scheduled time. If more than 4 days have passed, skip it and take the next dose on your regular day.
- Wegovy pill: If you miss a daily dose, skip it and take the next one the following day. Check with your prescriber about longer gaps.
Gaps of a few weeks, whether from a pharmacy delay, travel or cost, can bring side effects back at full strength if you restart at your old dose. That is one reason restarting often means stepping back down.
Changing your injection day
You can change your weekly day. For Wegovy, the label requires at least 2 days (48 hours) between doses. For Zepbound, it requires at least 3 days (72 hours).
Do you have to reach the highest dose?
No. The highest dose produced the most weight loss on average in the trials, but the right dose is the one that works for you with side effects you can live with. Some people do well on lower doses, and staying there is reasonable. Others need the full dose. Cost can also play a part, since some self-pay prices rise with dose. If you are wondering whether the drug is working, see our article on how fast people lose weight on these drugs.
A clinician will set and adjust your schedule based on your history, response and side effects. Our weight management program includes follow-up through the titration period, when questions come up most.
Questions patients ask us
Why does Wegovy start at 0.25 mg if that dose does not cause much weight loss?
The 0.25 mg starting dose is there to help your digestive system adjust, not to produce results. Nausea, vomiting and other side effects are most common when starting and after each increase. Stepping up every 4 weeks, as the prescribing information describes, gives most people a more tolerable path to the maintenance dose.
How long does it take to reach the full dose of Zepbound?
Zepbound starts at 2.5 mg and can go up by 2.5 mg after at least 4 weeks on each dose. Reaching 15 mg on the fastest standard schedule takes about 20 weeks. Many people take longer, and many stay on 5 mg or 10 mg, which are also approved maintenance doses.
Can I skip a step or increase my dose faster?
Not without your prescriber. Skipping steps generally means more nausea, vomiting and constipation, and it does not reliably speed up results. The 4-week minimum between increases in the prescribing information exists for tolerance. If you feel ready to move faster, discuss it at a follow-up rather than adjusting on your own.
What happens if I cannot tolerate a dose increase?
Your clinician may keep you on the current dose longer, step you back to the previous dose, or settle on a lower maintenance dose. The Wegovy label specifically allows delaying an increase by 4 weeks if it is not tolerated. Eating smaller, lower-fat meals and staying hydrated also help many people through the adjustment.
What should I do if I miss my weekly Wegovy injection?
Per the prescribing information, if your next scheduled dose is more than 2 days away, take the missed dose as soon as you can. If it is less than 2 days away, skip it and resume your usual day. If you miss more than 2 weeks, contact your prescriber, who may restart you at a lower dose.
What should I do if I miss a Zepbound dose?
The Zepbound label says to take a missed dose within 4 days, or 96 hours, of the scheduled time. If more than 4 days have passed, skip it and take the next dose on your regular day. Longer gaps can bring side effects back, so ask your prescriber before restarting at your previous dose.
Can I change the day of the week I inject?
Yes. The labels allow it as long as you leave enough time between doses: at least 2 days, or 48 hours, for Wegovy, and at least 3 days, or 72 hours, for Zepbound. After switching, keep to the new day each week. Tell your clinician if you are unsure how to time the change.
How do you take the Wegovy pill?
The Wegovy pill is taken once a day, first thing in the morning on an empty stomach, with no more than 4 ounces of plain water. You then wait at least 30 minutes before eating, drinking or taking other oral medicines. The dose steps up about monthly from 1.5 mg to 25 mg. Food or extra water reduces absorption.
Do I have to go up to the highest dose to lose weight?
No. Higher doses produced more weight loss on average in trials, but the right dose is the one that works for you with tolerable side effects. Some people do well long term on a lower dose. Others need the full dose. Your clinician will review your progress and side effects before each change.
Will I need to restart at a low dose after a long break?
Often, yes. After a gap of a few weeks, your body may react to your old dose as if it were new, with stronger nausea or vomiting. Your prescriber may restart you lower and step back up. The Wegovy label specifically mentions considering this after more than 2 weeks of missed doses.
Talk to a licensed clinician
Reading about a treatment is not the same as knowing whether it fits your history. A consultation is a conversation about your own situation — not a sales call, and not a promise of any outcome.
