Short answer: With GLP-1 weight-loss injections, the dose is increased (titrated) step by step under a doctor's supervision, usually in 4-week periods, to help the body build tolerance to the medication and to minimize digestive side effects.

Key takeaways

  • The starting dose is not a therapeutic dose; it is a low dose meant to build tolerance (for example, tirzepatide 2.5 mg, semaglutide 0.25 mg).
  • Clinical guidelines recommend staying on each step for at least 4 weeks.
  • If weight loss on the current dose is satisfactory and free of side effects, the dose increase can be postponed.
  • Mild nausea and loss of appetite may return for the first 2–3 days after a dose increase.

GLP-1 treatments start at the lowest dose, and the dose is increased gradually under a doctor's supervision. This gradual increase is called titration. Its purpose is not to speed up the effect but to reduce side effects: it gives the body time to adjust to each step.

This page is for general information only and does not replace medical advice. When and by how much the dose goes up is a decision for your doctor alone; do not increase or decrease the dose on your own.

Why start at the lowest dose?

These medications slow stomach emptying and prolong the feeling of fullness. Because the effect comes directly through the digestive system, starting at a high dose markedly increases nausea, vomiting and diarrhea. Starting low lets you reach the same point with less discomfort.

The starting dose is usually not a therapeutic dose; its only purpose is to get the body used to the medication.

What to expect after each increase

Side effects stand out at the start of treatment and again after each dose increase. So nausea that faded in the first weeks coming back at a new step is expected; it does not mean treatment is going badly.

This fluctuation usually lasts a few days and eases as the body adjusts to the new dose. If it persists or is severe, tell your doctor. It can be managed by adjusting the dose plan.

When is the dose increased?

The time between steps and the amount vary by product and are written in the package leaflet. The shared principle is this: you do not move to the next step without spending enough time on the current one. Your doctor may slow this schedule down based on how you respond.

If you did not tolerate a step well, staying on it longer or going back one step is also an option. Your doctor makes this decision.

What to watch for during a dose increase

  • Making portions smaller and eating slowly makes the first days after an increase noticeably easier.
  • Fatty and very spicy foods can make nausea worse.
  • If you have vomiting or diarrhea, watch for fluid loss; spread your water intake across the day.
  • Adequate protein and regular movement are recommended to preserve muscle mass.
  • Do not speed up dose increases on your own; titration exists precisely to reduce side effects.

Tracking the steps

Logging how long you stayed on each step and how you felt after each increase lets you give clear answers to your doctor's questions at a follow-up visit. Haftra keeps the dose, the injection day and your symptoms together; it does not suggest doses or calculate steps. It is free and can be used without an account.

iPhone, iPad and Apple Watch. Free.

Frequently asked questions

What happens when the dose goes up?

Side effects stand out at the start of treatment and again after each dose increase. They may return mildly for the first 2–3 days, but the body is better prepared than at the very start; the fluctuation usually eases as the body adjusts to the new dose and does not mean treatment is going badly.

Why start at the lowest dose?

These medications slow stomach emptying and prolong the feeling of fullness. Starting at a high dose markedly increases nausea, vomiting and diarrhea. Starting low lets you reach the same point with less discomfort.

When is the dose increased?

The time between steps and the amount vary by product and are written in the package leaflet. The shared principle is this: you do not move to the next step without spending enough time on the current one. Your doctor may slow this schedule down based on how you respond.

Is it mandatory to increase the dose every month?

No. If weight loss on the current dose continues at 0.5–1% per week and appetite control is strong, your doctor may keep the dose the same.

What happens if I cannot tolerate a dose increase?

If you did not tolerate a step well, staying on it longer or going back one step is also an option. Your doctor makes this decision.

What is the highest maintenance dose?

The maximum weekly dose is 15 mg for Mounjaro/Zepbound and 2.4 mg for Wegovy.

Sources

  • EMA - Mounjaro (tirzepatide)
  • EMA - Ozempic (semaglutide)
  • EMA - Wegovy (semaglutide)
  • NHS - Obesity treatment
  • U.S. Food and Drug Administration (FDA)

Last reviewed: August 4, 2026