Quick answer: the first shot takes a few seconds and most people feel only a small pinch. Both labels start at the lowest dose (2.5 mg weekly for Zepbound, 0.25 mg weekly for Wegovy) to let your body adjust, and that starting dose isn't meant for weight control on its own. Nausea, fullness or mild stomach upset in the first few days is common. Follow your prescriber's instructions and the pen's Instructions for Use.
Educational only, not medical advice. This article explains general information and quotes official labels where noted. It doesn't recommend any dose or change to your treatment. Follow your prescriber's instructions and the product label.
What's the starting dose?
From the labels:
- Zepbound: 2.5 mg once weekly for 4 weeks, then increased in 2.5 mg steps after at least 4 weeks on each dose. 2.5 mg is described as a starting dose, not a maintenance dose (Zepbound label).
- Wegovy: 0.25 mg once weekly for weeks 1 to 4, then 0.5, 1 and 1.7 mg, each for 4 weeks, then 2.4 mg (Wegovy label).
Your prescriber may adjust this. Follow your prescriber. See GLP-1 injection schedule basics.
What should you have ready?
- The pen or vial, at room temperature if the instructions say so
- Alcohol swabs and a sharps container
- A pen needle or syringe if your product needs one (Zepbound single-dose pens have a built-in needle)
- The Instructions for Use leaflet
- A calm time of day you can repeat each week
Where do you inject?
The labels list the stomach (at least 2 inches from the belly button), thigh or upper arm (the arm is easier if someone else helps). Our guide on how to give a subcutaneous injection walks through technique, and injection site reactions covers what's normal afterwards.
Does it hurt?
The needles are very fine and short. Most people describe a quick pinch or nothing at all. Letting the alcohol dry, relaxing the area and injecting room-temperature medicine (when allowed) can help. The autoinjector pens click when they start and finish; hold until the instructions say it's done.
What does the first week feel like?
Common in the first days:
- Feeling full sooner, less interest in food
- Mild nausea, especially after large or fatty meals
- Constipation or loose stools
- Burping or reflux
- Tiredness
Many people notice little at the starting dose. Eat smaller meals slowly, drink fluids and don't force food. Our GLP-1 side effects guide explains how long these usually last.
When should you call your doctor?
- You can't keep fluids down
- Severe stomach pain that won't go away
- Signs of an allergic reaction such as swelling of the face or throat, or trouble breathing (get emergency care)
- Signs of low blood sugar if you also take insulin or a sulfonylurea
Tracking it in Caliper
Log your first shot in Caliper with one tap, pick the injection site on the body map, and set your schedule and reminders so the next dose day is never a guess. A quick check-in over the next few days records how you felt, which helps when your prescriber asks about the first month.
FAQ
What should I expect after my first Zepbound shot?
Many people feel fuller sooner, and some have mild nausea, constipation or loose stools in the first days. The 2.5 mg starting dose is meant to help your body adjust.
Does the first Wegovy injection hurt?
Most people feel a quick pinch or nothing. The needle is very fine and short.
What is the starting dose of Wegovy?
The label starts at 0.25 mg once weekly for 4 weeks. Follow your prescriber's instructions.
Where should I give my first shot?
The labels list the stomach (at least 2 inches from the belly button), thigh or upper arm.
When should I call my doctor after the first shot?
If you can't keep fluids down, have severe stomach pain, or show signs of an allergic reaction.
Sources
- Eli Lilly, Zepbound prescribing information
- Novo Nordisk, Wegovy prescribing information
Keep the whole picture in one place
Caliper is a GLP-1 and peptide tracker. It logs each dose with one tap, records your injection site on a body map, and reminds you when the next dose is due. It never recommends or calculates a dose.
Log your first shot with Caliper →
For adults 18+.
Medical disclaimer: This article is for general educational purposes only and is not medical advice. It does not recommend any dose, compound, product, supplier or protocol. Always follow your prescriber's instructions and the product label, and talk to a pharmacist or healthcare provider about any question regarding your medication.