Guide
What to Expect Your First Month on a GLP-1
Starting a GLP-1 medication — whether it's Ozempic, Wegovy, Mounjaro, Zepbound, or a compounded version — comes with a lot of unknowns in the first few weeks. Here's a general week-by-week picture of what many people experience, so you have a sense of what's typical and what's worth flagging to your clinician.
Written by Claney Taylor, Founder
Medically reviewed by a qualified clinician
Week 1
The first shot
Most people don't notice dramatic changes in the first few days. Appetite suppression is usually mild at the starting dose, since GLP-1 medications are almost always titrated up slowly specifically to reduce side effects. Some people feel nothing different at all in week one — that's normal and doesn't mean the medication isn't "working."
Mild nausea, especially a few hours after the injection or after a meal, is the most commonly reported early effect. It tends to be more noticeable in the first 2–3 days after a dose and settle by days 5–7.
Week 2
Appetite starts to shift
By the second week, many people notice a genuine drop in hunger — smaller meals feel more filling, and "food noise" (constant thoughts about food) often quiets down for the first time. This is also when mild constipation or changes in digestion tend to show up, since GLP-1 medications slow stomach emptying.
Weeks 3–4
Settling into a rhythm
By the end of the first month, most people have a rough sense of their own pattern: which days after the shot feel hardest, what foods sit well, and how much they can realistically eat without discomfort. This is also typically close to when a first dose increase might be considered, depending on your prescriber's plan and how you've tolerated the starting dose.
What's typical
What's typical vs. what to flag
Mild nausea, some constipation, and reduced appetite are commonly reported in the first month. Severe abdominal pain, persistent vomiting, signs of dehydration, or any signs of an allergic reaction are not typical and warrant contacting your clinician or seeking urgent care promptly.
Track it
Why the first month is worth tracking closely
Because so much changes in these first four weeks — appetite, digestion, energy, and your relationship with food — it's easy to lose track of the details by the time your first follow-up appointment comes around. Was the nausea worse on day 2 or day 4? Did appetite drop before or after you started eating more protein? A day-by-day record from week one makes your first follow-up conversation far more useful than trying to remember it from memory.