What to Expect Your First Week on Wegovy®: Shot or Pill

On a GLP-1 forum, someone asked a stranger: "is it pills or injections?" (r/glp1) With Wegovy®, that is the first question. Its prescribing information covers a once-weekly injection and a once-daily tablet, so week one depends on which your prescriber chose.

The short answer: for both forms, that FDA label starts low and steps up to reduce stomach side effects, and lists nausea, diarrhea, vomiting, constipation and stomach pain among the most common. The clock differs: weekly shot or daily pill. Ask your prescriber about instructions for your form. Notice what you feel, write it down, and bring it to your prescriber.

What should I expect the first week of Wegovy®?

A starting step, on a different rhythm for each form. The Wegovy® label starts both the injection and the tablet at a starting dose and raises it in steps "to reduce the risk of gastrointestinal adverse reactions." Your prescriber sets those steps. Week one is the first of them.

The same label describes a once-weekly injection and a once-daily tablet. So by the end of week one, a shot diary holds one dose and a pill diary holds seven.

For a broader introduction, our week one guide covers starting a GLP-1.

Wegovy® shot or pill: how is the first week different?

Mostly in the rhythm of the record. The label describes a daily tablet and a weekly injection. A pill diary has an entry each day; a shot diary has a weekly dose date and an injection spot. Ask your prescriber or pharmacist about the instructions for your form.

Your diary just records what happened: on the pill, the time you took it and the time you first ate or drank; on the shot, the day, the time and which spot you used.

The label also says semaglutide reaches its highest level in the blood 1 to 3 days after an injection and about 1 hour after a tablet. It does not say side effects follow that timing. Your dated notes are what can show whether yours have a pattern, by day of the week on the shot or by time of day on the pill. Our pill vs injection guide covers how a daily habit and a weekly one feel different in general.

What are Wegovy® side effects in the first week?

There is no separate first-week forecast in the Wegovy® Medication Guide. Its general list of common side effects includes nausea, stomach pain, diarrhea, vomiting, constipation, upset stomach, heartburn, belching, gas, bloating, headache, dizziness and tiredness. In its injection trials, stomach side effects were most often reported while doses were being stepped up.

One item on that list may be unfamiliar: changes in skin sensations. The label describes these as things like sensitive skin or a burning feeling on the skin, seen with both the injection and the tablet. If something like that shows up, it gets a line in your notes like any other symptom.

MedlinePlus says, for both semaglutide injection and semaglutide tablets, to tell your doctor if nausea, vomiting, diarrhea, stomach pain, constipation, heartburn or burping are severe or do not go away.

Weighing whether to try semaglutide, one person in r/glp1 wrote: "I'm afraid to try sema cause I've heard the symptoms can be brutal." Neither what you have heard nor a label list is a forecast. Your notes show which, if any, actually turn up.

When is a first-week symptom a phone call, not a note?

On the pill or the shot, some symptoms skip the diary. The Wegovy® Medication Guide names several that call for contacting a healthcare provider or getting medical help, not waiting for a follow-up. Write down when it started and when you called.

Belly pain that is severe and constant, sometimes reaching through to the back, with or without nausea or vomiting. The guide connects it with possible pancreatitis, gives specific instructions for it and says to call your healthcare provider right away.
Stomach upset that keeps going. Ongoing nausea, vomiting or diarrhea can drain fluids, and the guide says that may lead to kidney problems and asks you to tell your provider right away.
Upper belly pain, yellow skin or eyes, fever or clay-colored stools. The guide lists these as possible gallbladder problems and says to call your provider.
A racing or pounding heartbeat that lasts several minutes. The guide says Wegovy® can raise your heart rate at rest and to tell your provider.
Signs of a serious allergic reaction, such as a swollen face, lips, tongue or throat, trouble breathing or swallowing, or fainting. The guide says to get medical help right away.

If you have type 2 diabetes and use insulin or a sulfonylurea, the guide says low blood sugar is more likely. How to spot it is a question for your prescriber; each episode goes in your log with the time.

What should you write down in your first week on Wegovy®?

Whichever form you take, write down when you took it, what you felt and when, and every other medicine you take. The shot and the pill need slightly different lines around the dose, so the template below gives each its own column.

What	On the shot	On the pill
The dose	Day and time of the shot	Time you took the tablet, each day
Around it	Which spot you used	Time of your first food, drink or other medicine after it
Side effects	What, when it started and stopped, strength 0 to 10	Same
Other medicines	Name and time taken	Name and time taken
Warning signs	Any symptom from the list above, and when you called	Same

The "other medicines" line matters. The Medication Guide says Wegovy® slows stomach emptying and can affect medicines that need to pass through the stomach quickly, and asks you to keep a list of your medicines to show your healthcare provider and pharmacist. Bring that list, with your first week of notes, to your next appointment.

FAQ: first week on Wegovy®

Do side effects in the first week mean Wegovy® is working?

The Wegovy® label does not describe side effects as a sign of whether the medicine is working, and it sets no first-week result to check against. A quiet week and a rough week are both worth logging with dates. What your own notes mean is a question to ask your prescriber.

What if I miss my Wegovy® pill or shot in the first week?

The Medication Guide has separate missed-dose instructions for the injection and the tablet, so the answer depends on your form, not on a forum thread. Write down the date you missed and what you did next. For what to do, ask your prescriber or pharmacist.

Can I switch between the Wegovy® shot and the pill?

Both forms are in the same label, but each has its own starting step and schedule, so a switch is not a simple swap. If it happens, log the date so your side effect notes line up with the new rhythm. Ask your prescriber whether and when to switch.

Tinsy is a wellness diary, not a medical device. It does not diagnose, treat or give medical advice. Always talk to your prescriber about doses, side effects and anything that worries you.

You can keep this log in a notebook. Tinsy logs your shots or your daily pill for free: at setup you tell it which you take, then it logs each dose, sends dose reminders and keeps a calendar and history, with a body map for the shot that remembers your last spot and suggests the next one. Tinsy Plus adds side effects with severity levels next to your dose, charts including your estimated medication level over time, and a doctor report (PDF). More on our Wegovy® tracker page.