The short answer
Do five things before your first shot: give your prescriber your full history and medicine list, learn your exact pen, pick a shot day you can keep, stock small easy meals, fluids and a constipation plan, and learn the few symptoms that need a same-day call. The first dose is a low starting dose meant to let your stomach adjust, so a calm first week matters more than fast results.
At GLP-1 SOS, many people who write to us in week one say the same thing: nobody told them what to get ready. The shot takes seconds. The preparation decides whether the first month feels manageable. Here is the checklist we would hand a friend before her first dose.
At a glance
Three things to settle before dose one
1
Your history, out loud
Thyroid cancer in the family, pancreatitis, gallbladder trouble, pregnancy plans, insulin. Your prescriber needs all of it.
2
Your pen, in your hands
Pens, vials and syringes all work differently. Learn the one you were given, with the Instructions for Use open.
3
Your first week, planned
A fixed shot day, small meals ready, fluids on hand and a constipation plan.
Why preparation matters more than the first dose
Every GLP-1 starts low on purpose. Wegovy starts at 0.25 mg a week for four weeks; Zepbound starts at 2.5 mg for four weeks, and its label says that dose is for starting treatment, not maintenance. Both labels say the slow climb is there to reduce stomach and bowel side effects. The first month is built for your gut, not the scale, which is why little or no weight change in week one is common.
Lab note
The first dose is a test drive for your stomach. Plan the week around comfort, not results.
These medications slow how fast your stomach empties, and the Zepbound label notes the delay is largest after the first dose and eases over time. That is why early fullness, nausea and constipation tend to show up in the first weeks and after each dose step. It is also why the labels ask you to tell any surgeon or anesthesia team that you take a GLP-1 before a planned procedure.
A few things change the plan entirely. The labels list a personal or family history of medullary thyroid cancer or MEN 2 as a reason not to use these medications. If you take insulin or a sulfonylurea, your prescriber may lower that dose to avoid low blood sugar. And the Wegovy label advises stopping at least 2 months before a planned pregnancy.
From the labels
Three numbers to know before you start
4 weeks
on the starting dose before the first increase, per the Wegovy and Zepbound labels; the start is meant to protect your stomach
36°F to 46°F
refrigerator storage for unused pens, never frozen, per the Wegovy and Zepbound labels
2 months
how long before a planned pregnancy the Wegovy label advises stopping semaglutide
Sources: Wegovy Prescribing Information, June 2026; Zepbound Prescribing Information, August 2026.
Your prep checklist
- Tell your prescriber everything, in one list. Conditions (thyroid cancer in the family, pancreatitis, gallbladder or kidney problems, diabetic eye disease), pregnancy plans, and every medicine and supplement, including insulin, sulfonylureas and birth control pills.
- Learn your exact device before the day. Ask for a demonstration of your pen, vial or syringe and read the Instructions for Use in the box; the labels advise training before the first dose. Inject into the belly, thigh or upper arm, and change spots each week.
- Pick a shot day you can keep for months. Same day each week, any time of day, with or without food. An evening before a quieter day lets the first queasy stretch land at home. Our injection day tips cover that first day.
- Set up storage and disposal. Keep unused pens in the fridge, away from the cooling element and never frozen. Get an FDA-cleared sharps container from a pharmacy; when it is about three-quarters full, follow your local rules for getting rid of it.
- Stock the kitchen for a smaller stomach. Small portions of eggs, yogurt, soup, crackers, lean protein and cooked vegetables, plus water or broth you will actually sip. Greasy, heavy meals are the ones that tend to go badly early on.
- Start your gut routine before you need it. Constipation is one of the most common early effects, and it is easier to keep things moving than to restart them; see preventing constipation before it starts. We built GLP-1 SOS Daily Gut Relief for this stage: 2 capsules with dinner give magnesium to support regular bowel movements, plus ginger and peppermint for digestive comfort.*
- Write down your starting point. Weight, waist, energy, bowel habits and appetite. Two minutes now gives you and your prescriber a baseline for the week-four dose decision.
*GLP-1 SOS Daily Gut Relief supports regular bowel movements and digestive comfort. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Week one
Expected in week one, or a same-day call
Usually expected
- Feeling full after a few bites
- Mild nausea a day or two after the shot
- Fewer or harder bowel movements
- Less interest in food
Call the same day
- Severe belly pain that will not ease, with or without vomiting
- Vomiting that keeps you from holding down liquids
- Pain under the right ribs, fever, or yellow skin or eyes
- Swelling of the face or throat, or trouble breathing (call 911)
Most week-one symptoms are the starting dose doing its job. The right-hand list is never something to wait out.
When to call your doctor
Call your prescriber the same day if, after your first dose:
- You have severe belly pain that will not go away, with or without vomiting
- You cannot keep liquids down, or you feel dizzy and are urinating much less
- You have pain under the right ribs, fever, or yellowing of the skin or eyes
- You use insulin or a sulfonylurea and have shaky, sweaty or confused spells
- You have swelling of the face, lips or throat, or trouble breathing (call 911)
A slow, prepared start is the plan working. Severe pain, vomiting you cannot control and allergic reactions are not.
From the people behind the Lab
You do not have to figure this out alone.
GLP-1 SOS is the daily companion made for life on a GLP-1. Plain answers like this one, a support team that replies to real questions from real people, and daily formulas like GLP-1 SOS Daily Gut Relief, designed around the side effects that come with the medication. The GLP-1 Lab is our free education arm: no login, no paywall, no hype. Side effects are part of the road. Suffering through them is not.
Questions people also ask
What should I eat before my first Ozempic or Wegovy shot?
Nothing special is required; the labels say the shot can be taken with or without meals. What helps is eating lighter around the first dose, a normal-size low-fat meal rather than a heavy or greasy one, and sipping fluids through the day. For the first week, plan small portions of easy foods like eggs, yogurt, soup and crackers.
Does the first shot of Zepbound or Mounjaro hurt?
Most people describe a quick pinch or very little. The pens place a thin needle just under the skin of the belly, thigh or upper arm. Following your Instructions for Use step by step and holding the pen steady for the full count both help. Mild redness, itching or a small bump can happen; the labels list injection site reactions, and they usually fade.
Do I need blood tests before starting a GLP-1?
The labels do not require a specific blood panel before the first dose, but many prescribers check blood sugar, kidney function and sometimes cholesterol or liver tests. A joint advisory from four obesity and nutrition societies recommends baseline screening of eating habits, medical conditions and muscle strength. Ask which tests your prescriber wants, and bring your full medicine and supplement list.
Can I start a GLP-1 if I take birth control pills?
Yes, but plan for it. The Zepbound and Mounjaro labels advise switching to a non-oral method or adding a barrier method for 4 weeks after starting and for 4 weeks after each dose increase, because the slowed stomach may make the pill less reliable. An IUD, implant or ring is not affected. Ask your prescriber what applies to your medication.
How much weight will I lose in the first month on a GLP-1?
Often less than people expect. The first four weeks are a low starting dose designed to let your stomach adjust, and the labels do not promise any amount for month one. The trial results people quote were measured after more than a year. Read how long a GLP-1 takes to start working for the usual timeline.
Sources (5)
- Wegovy (semaglutide) injection and tablets, Prescribing Information. Novo Nordisk / FDA, revised June 2026.
- Zepbound (tirzepatide) injection, Prescribing Information. Eli Lilly, revised August 2026.
- Mounjaro (tirzepatide) injection, Prescribing Information. Eli Lilly, revised August 2026.
- Best Way to Get Rid of Used Needles and Other Sharps. U.S. Food and Drug Administration, content current as of August 2023.
- Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. The American Journal of Clinical Nutrition, 2025.
Reviewed by the GLP-1 SOS editorial team · Education, not medical advice · Talk to your prescriber about your dose and your symptoms.
