Week 1 on Semaglutide: What to Expect After Your First Injection
Your first week is mostly an introduction. The 0.25mg starter dose is intentionally low — it is designed to let your body meet the medication gently, not to drive dramatic weight loss.
The 0.25mg dose is technically a non-therapeutic dose. According to the Ozempic dosing schedule, this first month exists so "your body has a chance to get used to the medicine." Most people will not see dramatic appetite changes on day one, and that is by design.
What you may notice in week one is subtle: a slightly quieter pull toward snacking, smaller meals that feel satisfying, or a vague awareness that food is no longer the loudest signal in your day. For some people, mild nausea or fatigue arrives within 24-72 hours of the injection. For others, the week feels almost uneventful. Both experiences are normal.
The work of week one is mostly about laying down habits — picking your injection day, learning to hydrate well, and noticing your baseline before the medication has fully taken hold.
Appetite Suppression
Gentle and inconsistent at the starter dose. Most users describe a quiet shift rather than a strong effect.
Some early loss is common, often partly water weight. The starter dose is not yet at therapeutic levels.
The Week 1 Timeline
The Week 1 Timeline
Day 1 (Injection)
First Injection
Pick a consistent day of the week. Most people feel nothing immediately — the medication takes time to reach a steady level in your system.
Days 2-3
First Signals
Mild nausea, fatigue, or a slightly off appetite may appear here. Symptoms are usually low-grade at the 0.25mg dose.
Days 4-7
Settling In
By the end of the week, most early sensations soften. You may notice you are eating slightly less without effort.
Symptoms this week
Navigating Symptoms
At 0.25mg, side effects are usually mild and short-lived. If nausea is strong, slowing down at meals and choosing lighter foods (broth, toast, plain protein) usually helps more than medications in this first week.
What to focus on
This is the week to build infrastructure. Pick your weekly injection day and time, and store it somewhere you will not lose track of it — a calendar reminder works well. Most clinicians recommend the same day each week, which keeps your medication level steady.
Hydration matters more than it usually does. GLP-1 medications slow gastric emptying, which means you may feel less thirsty even when you need water. Aim for steady sips throughout the day rather than large amounts at once, which can feel uncomfortable in a slower-emptying stomach.
Protein is the other habit to start now. As your appetite quiets over the coming weeks, smaller meals will need to do more nutritional work. Building a default of protein-forward meals — eggs, yogurt, lean meat, tofu, beans — early on means you do not have to think about it later. For more general guidance, see the resources hub.
What other users report
What Users Report
“Honestly, my first week was anticlimactic. I felt a little tired on day three, but the big shifts came later. I'm glad I went in with low expectations.”
— Jenna R.
“I had mild nausea after dinner on day two, and that was it. The biggest thing I noticed was that I forgot to snack in the evening, which never happens.”
— Marcus T.
Looking ahead
Week one is groundwork. The starter dose is intentionally gentle and the most noticeable shifts tend to arrive later. In Week 2, the medication has had more time to build up, and the appetite changes often start to feel real.