Your First Month on GLP-1 Medication: A Week-by-Week Timeline

Overview: What the First Month Looks Like

The first month of GLP-1 therapy is a period of adjustment. Your body is adapting to a new hormonal signal, your dose is at its lowest starting level, and the most noticeable changes are often in appetite and digestion rather than on the scale. This is completely normal — and expected.

Week 1: Your First Injection

Most patients inject their first dose and feel relatively normal for the first day or two. The starting dose is intentionally low to allow your body to adjust. Some patients notice mild nausea within the first 24–48 hours, particularly after meals. Eating smaller, lower-fat meals can help minimize this.

You may not notice a dramatic change in appetite during week one — this is normal. The medication's appetite-suppressing effects build gradually over the first few weeks.

Week 2: The Appetite Shift

By the second week, most patients begin to notice a meaningful reduction in hunger. Meals that previously felt too small now feel satisfying. The urge to snack between meals diminishes. Some patients describe a reduced interest in high-calorie foods they previously craved.

This is also when GI side effects tend to peak. Nausea, loose stools, or constipation are common. Staying well-hydrated, eating slowly, and avoiding greasy or spicy foods can help significantly.

Week 3: Finding Your Rhythm

For most patients, GI side effects begin to improve in week three as the body adapts. Eating patterns start to feel more natural at smaller portions. You may notice your first measurable weight change on the scale — though the primary goal of the first month is adaptation, not rapid weight loss.

Week 4: End of Month One

By the end of the first month, most patients have lost between 2 and 5 pounds. More importantly, they have established a new relationship with food — eating less, feeling satisfied sooner, and experiencing fewer cravings. Your RxVigor physician will review your progress and determine whether a dose increase is appropriate for month two.

What to Track in Month One

Keep a simple log of the following to share with your care team at your month-one check-in:

• Injection date and any site reactions
• GI symptoms (nausea, constipation, diarrhea) and their severity on a 1–10 scale
• Weekly weight (weigh yourself at the same time of day, ideally in the morning)
• Any other symptoms or concerns

When to Contact Your Care Team

Reach out to [email protected] or your prescribing physician if you experience: severe or persistent vomiting, abdominal pain that radiates to your back (possible pancreatitis), vision changes, rapid heart rate, or any allergic reaction symptoms such as rash, swelling, or difficulty breathing.