GLP-1 side effects week by week: what's common, what helps, what to log

The honest timeline

Everyone's course is their own, but patient labeling and clinical resources describe a recognizable shape:

• Weeks 1–2. Starting doses are intentionally low, so some people feel very little. Others meet nausea early — often strongest in the days right after a dose, then fading.
• Weeks 3–4. For many, early queasiness begins to settle as the body adjusts to a steady dose.
• After each dose increase. Expect the possibility of a replay — usually milder and shorter than the first time. This bump-then-settle pattern is exactly what a daily log makes visible.
• As the weeks pass on a stable dose. Many people find digestive effects ease substantially — most side effects are mild and often improve as your body adjusts. Symptoms that persist or worsen instead are worth a conversation with your prescriber — not toughing out.

If your experience doesn't match this shape, that isn't failure — it's information. Bring it to your clinician.

The common ones, and what tends to help

These are the approaches commonly suggested in patient education materials — run them past your own clinician, who knows your situation:

• Nausea. Smaller meals, eaten slowly; bland, lower-fat choices on rough days; stopping at "satisfied" instead of "full"; fluids through the day. Some people plan their dose for the evening before an easier day — if you're thinking of changing your usual dose day or time, check with your prescriber or pharmacist first.
• Constipation. Fluids first — appetite suppression quietly reduces drinking, too. Then fiber, gradually, and daily movement. Mention it if it persists; it's common and treatable.
• Diarrhea. Often dose-step-related and short-lived; hydration is the priority. Persistent diarrhea deserves a call.
• Reflux and burping. Smaller portions and not lying down right after eating help many people.
• Fatigue. Some people notice it in the early weeks. Check the basics a log reveals: eating enough protein, drinking enough, sleeping enough.
• Injection-site soreness. Usually minor and brief — rotating sites helps prevent it. (Here's how rotation and logging work together.)

Red flags: call your clinician now, or seek urgent care

Some symptoms are outside "log it and watch." Contact your prescriber promptly — or urgent/emergency care if severe — for:

• Severe or persistent abdominal pain, especially if it spreads to your back, with or without vomiting.
• Vomiting you can't stop, or signs of dehydration — very dark urine, dizziness, producing little urine.
• Pain in the upper right belly, fever, or yellowing of the skin or eyes.
• Symptoms of low blood sugar — shakiness, sweating, confusion — particularly if you also take diabetes medication.
• A lump or swelling in the neck, hoarseness, or trouble swallowing.
• New or worsening feelings of depression, or any thoughts of harming yourself — reach out to your clinician right away, or call or text 988. Whatever its cause, this is always worth acting on.
• Signs of allergic reaction: rash, swelling of face, lips, tongue, or throat, or trouble breathing — this one is emergency care.

Most of this list comes from patient medication guides (linked below), and it is not complete — when something feels seriously wrong, trust that instinct and call.

Why logging beats remembering

At your follow-up, your prescriber will ask some version of: How did the last step treat you? "Kind of rough, I think?" and "Nausea peaked at a six for two days after the increase, settled to a one by Friday" lead to very different conversations. Dose decisions are made from your reports — a simple daily severity note, kept the same way every day, is the difference between guessing and knowing. It also protects you from recency bias: one bad Tuesday can convince you the whole month was bad. The log knows better.

Keep it small: each day, score how you're doing on the symptoms that matter to you — nausea, digestion, energy — plus water. Ten seconds. (Here's the full picture of what's worth tracking.)

How GLP 100 helps

GLP 100's daily check-in scores hunger, nausea, energy, and hydration in about a minute, and keeps your symptom history next to your dose log — so the bump-then-settle arc after each dose step is right there on the screen, ready to bring to your clinician. The app never suggests medication changes. Everything stays on your iPhone. (For the whole journey's shape, see the 100-day roadmap.)