Gut symptoms are common, and in the trials most were reported while the dose was going up and became less frequent over time. A small set should never be waited out.
| Side effect (trial rate, drug vs placebo) | Wegovy 2.4 mg | Zepbound 15 mg | Saxenda 3.0 mg |
|---|---|---|---|
| Nausea | 44% vs 17% | 31% vs 10% | 40% vs 15% |
| Diarrhea | 32% vs 16% | 23% vs 7% | 21% vs 9% |
| Vomiting | 25% vs 7% | 12% vs 2% | 16% vs 4% |
| Constipation | 23% vs 10% | 12% vs 6% | 20% vs 9% |
| Stopped drug because of side effects | 7% vs 3% | 6% vs 3% | 10% vs 4% |
| Gallbladder problems | Gallbladder-related disorders 2.6% vs 1.2% (STEP 1) | Gallstones 1.1% vs 1.0%; gallbladder inflammation 0.7% vs 0.2% (Zepbound prescribing information) | Gallstones 2.2% vs 0.8%; gallbladder inflammation 0.8% vs 0.4% (Saxenda prescribing information) |
STEP 1, SURMOUNT-1, SCALE: separate placebo-controlled trials, not head-to-head. Oral semaglutide 25 mg shows the same pattern as the injection.
Food timing and size. Four or five small meals beat three normal ones. Protein first on the plate. Drink between meals, not with them.
Injection timing. Many people inject in the evening so peak nausea overlaps with sleep. Keep the same day each week. Missed dose: the Zepbound label says take it within 4 days, otherwise skip it; the Wegovy label says take it if the next dose is more than 2 days away, otherwise skip it. Details and sources on the missed-dose answer.
Constipation kit. Psyllium or a fibre supplement, magnesium citrate at night, and a real walk. Nothing for 3+ days? Tell your prescriber; osmotic laxatives are commonly used.
Nausea kit. Ginger, small bland carbs (crackers, toast), and cold food, which smells less. Prescribers sometimes add an anti-nausea medication for titration weeks.
Dehydration is easy to miss. Less hunger means fewer thirst cues and less water from food. Headache and fatigue are often linked to low fluid intake; if they persist, contact your prescriber.
Grouped from the Wegovy and Zepbound prescribing information (warnings, patient counseling and the Wegovy Medication Guide). If you are unsure which group you are in, call: your prescriber, an after-hours line or a pharmacist can tell you whether to wait.
Mild nausea, early fullness, smaller appetite, constipation, mild diarrhea, burping, reflux, mild headache or tiredness, especially in the days after a dose step. What helps is above. Mention them at your next visit, and call sooner if they get worse, don't settle, or stop you eating or drinking.
Surgery or sedation coming up? Tell the anesthesiologist you're on a GLP-1; slowed stomach emptying changes the fasting rules.
Do not use (all four labels: Wegovy, Zepbound, Saxenda, Foundayo): a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia type 2, or a prior serious allergic reaction to that medicine or its ingredients.
Pregnancy: weight-loss medicines are not appropriate during pregnancy, and every label says to stop when pregnancy is recognized. If you are planning a pregnancy, the Wegovy label says to stop at least 2 months before; ask your prescriber about the medicine you take. Tirzepatide (Zepbound) and orforglipron (Foundayo) can make birth-control pills less reliable for a few weeks after starting and after each dose increase, so those labels advise a non-oral method or adding a barrier method. Each drug's own rules are side by side on the comparison.
Extra caution and a real conversation first: history of pancreatitis, gallbladder disease, gastroparesis or severe GI disease, diabetic retinopathy, kidney impairment, or an eating disorder.
These products are optional and are not treatments for GLP-1 side effects. They are for the mild, at-home end only; anything in the two groups above needs a call, not a purchase.
Psyllium fibreA common fibre supplement for mild constipation Sugar-free electrolytesOptional on mild days when you're drinking but plain water is hard to face; not a substitute for care if fluids won't stay down Ginger chewsSome people use them for mild nausea; no prescription Whey isolateProtein on days when solid food is hardThree questions tell you the cheapest way to start — with insurance, direct from Lilly or Novo, or through a compounding pharmacy.
Find my cheapest route →One short email a week on GLP-1 treatment: what the trials and prescribing labels describe at each stage, and changes in cost and access. General information, not tied to a particular medication or dose. For the trial average for your own medication, use the curve calculator.
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