# The first month on a GLP-1: what to record. By [Max HP](https://maxhp.me/about) · Updated 3 November 2026 The first month is mostly administration: starting a dose, learning the pen or pill routine, and noticing what changes. The labels describe the common early effects. A short daily record makes the month reviewable, without asking you to interpret it. ## Before the first dose The first month begins before the first injection or tablet. Read the Instructions for Use that come with your medication, and keep them somewhere you can find them again. The label tells you where the pen goes, how the needle is attached, how the dose is selected and what to do with the pen between doses. For a tablet, it tells you how much water to use and how long to wait before food. Those instructions are specific to the product, and they are not interchangeable. The label also contains a starting dose and a schedule for increasing it. That schedule belongs to your prescriber, who applies it to your history and your response. The useful thing to record is not what the label says the next step could be. It is what your prescriber actually prescribed, and when you started it. If you inject, decide where you will keep the pens and how you will remember the day. If you take a tablet, decide where the bottle lives and what the first drink of the morning will be. A routine that fits the rest of your day is easier to repeat than one that requires a clear kitchen at 7 a.m. ## The first week The labels list the most common adverse reactions across the whole trial population: nausea, diarrhea, vomiting, constipation, abdominal pain, fatigue, headache and injection-site reactions among them. The Wegovy® label puts it this way: “Most common adverse reactions (incidence ≥5%) in adults or pediatric patients aged 12 years and older are: nausea, diarrhea, vomiting, constipation, abdominal pain, dysesthesia, headache, fatigue, dyspepsia, dizziness, abdominal distension, eructation, hypoglycemia in patients with type 2 diabetes, flatulence, gastroenteritis, gastroesophageal reflux disease, and hair loss.” A list like that can make the first week sound inevitable. It is not. It describes what was reported across a trial, not what one person will feel. Some people notice appetite changes quickly; some notice nothing for weeks; some feel sick for a day or two and then settle. The first week is a time to observe, not to grade yourself against a table. Record what you notice in plain terms: appetite, nausea, bowel changes, headache, tiredness, the site. Note the time of day and whether it followed the dose. Do not try to decide yet whether the medication is “working.” One week is too short a window for that question, and the answer is not yours alone to make. The percentages in the label are there to inform, not to predict. A 5% rate means five people in a hundred in that trial reported the event; it does not mean a 5% chance for you, and it does not say how long the event lasted. The trial tables are a map of what was common enough to count. Your own first week is the territory. ## What to record for the month - **Each dose**: The date, time, amount and form. If the prescriber changes the dose, start a new step rather than overwriting the old one. - **The site, if you inject**: Which area and which side. A body map or a one-line note is enough. - **How the day felt**: One line: appetite, nausea, energy, sleep, anything unusual. A word and a severity is more useful than a paragraph written a month later. - **Bowel changes**: Constipation and diarrhea are both common in the labels, and they are easy to forget by the time of the appointment. - **Weight, if you weigh**: Same time of day, same scale. One reading is noise; a week of readings is a trend. - **Supply**: How many pens, vials or packs are left. The first refill often arrives sooner than expected. At the end of each week, read the entries back for two minutes. You are not looking for a verdict. You are looking for a sentence you can say at the next appointment: “The first two days after the dose were the worst, then it settled,” or “The nausea came back when the dose changed.” That sentence is worth more than a month of unread entries. Know who to contact before you need them. The prescriber’s office, the pharmacy and the after-hours line are three different numbers, and the first month is when a question is most likely. Put them in the same place as the log, or in the phone’s contacts, so the answer does not depend on finding an email at midnight. The first month is also a reasonable time to ask the prescriber which symptoms warrant a call and which can wait for the next visit, so the answer is in the record before it is needed, not reconstructed after the fact from a vague memory. That is enough for the first month. ## When to call Most early effects are unpleasant rather than dangerous, and they settle. Some signs are different. The labels warn about serious allergic reactions, and the Medication Guide lists the symptoms plainly. The Wegovy® guide says: > “Stop using WEGOVY and get medical help right away, if you have any symptoms of a serious allergic reaction including: swelling of your face, lips, tongue or throat; severe rash or itching; very rapid heartbeat; problems breathing or swallowing; fainting or feeling dizzy.” Severe or persistent vomiting, severe abdominal pain, or dehydration are also reasons to seek advice rather than wait for the next scheduled contact. If any of the signs above appear, contact your prescriber, or get emergency help. ## Questions **How long does it take for a GLP-1 to work?** The labels report trial results over months, not days, and the averages cover a whole study population. Some people notice appetite changes in the first week; others do not. Your prescriber is the person to ask about your own response. **Is it normal to feel nothing in the first month?** It can happen. The starting dose is often lower than the dose used later in treatment, and the label’s trial results are not a promise about the first four weeks. Keep recording what you notice and raise the question at your next contact. **What if I miss a dose in the first month?** Write down the date and what happened, then check the label for your medication and ask your prescriber. The labels give different windows, and the answer depends on the medication and the timing. This article does not decide it for you. **Do I need to change what I eat?** That is a conversation for your prescriber or a dietitian, not a rule in a tracker. The label’s advice about food and water is specific to the medication and the form, and it is worth reading before the first dose. ## Sources 1. [Ozempic® (semaglutide) prescribing information](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=adec4fd2-6858-4c99-91d4-531f5f2a2d79)⁠, DailyMed. Revised May 2026. Read 3 November 2026. 2. [Wegovy® (semaglutide) prescribing information and Medication Guide](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b)⁠, DailyMed. Revised June 2026. Read 3 November 2026. 3. [Zepbound® (tirzepatide) prescribing information](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=487cd7e7-434c-4925-99fa-aa80b1cc776b)⁠, DailyMed. Revised August 2026. Read 3 November 2026. 4. [Mounjaro® (tirzepatide) prescribing information](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d2d7da5d-ad07-4228-955f-cf7e355c8cc0)⁠, DailyMed. Revised August 2026. Read 3 November 2026. ## Read more - [What to track on a GLP-1](https://maxhp.me/blog/what-to-track-on-glp-1) - [GLP-1 dose steps, explained](https://maxhp.me/blog/glp-1-dose-steps) - [Missed a GLP-1 dose?](https://maxhp.me/blog/missed-dose) - [Free appointment checklist](https://maxhp.me/glp-1-appointment-checklist) Coming soon to the App Store --- Canonical: https://maxhp.me/blog/glp-1-first-month · Updated 2026-11-03