How Long Do Semaglutide Side Effects Last?

What the labels say about timing

If you are asking how long semaglutide side effects last, the labels answer with timing, not a number of days. The Ozempic label, dated June 2026, puts most of those reports during dose escalation¹. As of August 2026, the Zepbound and Mounjaro labels say most nausea, vomiting and diarrhea happened during dose escalation and decreased over time^2,3. Copy the phrase exactly and keep the product name with it.

The Wegovy label version read for this page, dated June 18, 2026, gives no duration⁵. You can compare it with side effect rates in FDA labels.

What a pooled trial analysis reports

A 2022 paper, published online in 2021, pooled three 68-week semaglutide trials, numbered 1 to 3⁴. Median episodes lasted 8 days for nausea, 3 for diarrhea, 2 for vomiting and 47 for constipation, versus 35 on placebo⁴. These are trial medians, not your number.

Most gastrointestinal events were mild to moderate, at 98.1%, and happened most often during or shortly after dose escalation⁴. Of participants on semaglutide, 4.3% stopped treatment because of them⁴. Novo Nordisk A/S funded the trials⁴.

Why this page cannot tell you your number

As of September 16, 2025, FDA says it does not review compounded drugs for effectiveness or quality before they are marketed⁶. The label wording and trial numbers here describe approved products. Trials, products and people differ, so none of it is a forecast for you. In your notes, keep label facts, trial medians, injection site reactions in labels and dated FDA alerts in separate sections.

What the Medication Guide says to do

The Medication Guides say to talk to your healthcare provider about any side effect that bothers you or does not go away^2,5. They also print FDA's reporting number, 1-800-FDA-1088. That number reaches MedWatch, FDA's route for patients and clinicians to report adverse events and product quality problems⁷.

In an emergency, call 911. Poison Help is 1-800-222-1222, as listed on October 12, 2026⁸.

Note when it gets easier

Use Note it in your log when it got easier for a dated note beside your own entries. Keep it in the side effect log, or next to a GLP-1 tracker or peptide tracker.