Wegovy vs. Zepbound Side Effects: How They Compare
Wegovy (semaglutide) and Zepbound (tirzepatide) are the two most widely prescribed weight management medications, and many people want to know which one is easier to tolerate. Both labels report side effects from their clinical trials, so you can compare them side by side. The comparison is useful, but it comes with an important caveat, covered below.
Side effects reported in the trials
The numbers below come from the Wegovy prescribing information (2.4 mg dose) and the Zepbound prescribing information (5 mg, 10 mg, and 15 mg doses). Each shows the share of people who reported the side effect, with the placebo rate in parentheses.
| Side effect | Wegovy | Zepbound |
|---|---|---|
| Nausea | 44% (16%) | 25% to 29% (8%) |
| Diarrhea | 30% (16%) | 19% to 23% (8%) |
| Vomiting | 24% (6%) | 8% to 13% (2%) |
| Constipation | 24% (11%) | 11% to 17% (5%) |
| Fatigue | 11% (5%) | 5% to 7% (3%) |
| Hair loss | 3% (1%) | 4% to 5% (1%) |
| Headache | 14% (10%) | Not listed in the same table |
Why you can't simply pick the lower number
These figures come from separate trials, run at different times, with different groups of people and different placebo rates. Notice that the placebo group in the Wegovy trials reported nausea twice as often as the placebo group in the Zepbound trials. That alone tells you the trials measured side effects differently, so the numbers are not a true head-to-head comparison.
What both labels agree on is the pattern: digestive side effects are the most common, they are usually mild to moderate, and they tend to happen most while the dose is being increased.
How each medication is started
Both medications start at a low dose and step up slowly to give your body time to adjust.
- Wegovy: 0.25 mg once weekly for the first 4 weeks, then increases every 4 weeks through 0.5 mg, 1 mg, and 1.7 mg, reaching the 2.4 mg maintenance dose at week 17.
- Zepbound: 2.5 mg once weekly for the first 4 weeks, then increases in 2.5 mg steps at least 4 weeks apart, according to the Zepbound dosing guidelines. Maintenance doses are 5 mg, 10 mg, or 15 mg.
If side effects are hard to manage, your prescriber may keep you at a dose longer before increasing it.
Managing side effects on either medication
The same habits help on both:
- Eat smaller meals and stop at the first sign of fullness. See our guide to nausea on GLP-1 medications.
- Add fiber and fluids gradually to stay regular. See constipation on Mounjaro and Zepbound.
- Replace fluids and electrolytes if you have diarrhea or vomiting. See diarrhea on GLP-1 medications.
- Make protein a priority to protect muscle. See how much protein you need on a GLP-1.
Where Alula fits
Alula is a daily drink mix designed for people on GLP-1 medications, whichever one they take. Each stick includes electrolytes (350 mg sodium, 220 mg potassium, and 130 mg magnesium), 1,500 mg of calcium HMB, 2 g of collagen peptides, 2 g of PHGG fiber, a Bacillus coagulans probiotic (about 2 billion CFU), 250 mg of ginger root extract, and a full panel of vitamins and minerals, to support hydration, digestive comfort, muscle retention, and daily nutrient intake when you are eating less.* It does not change how your medication works and is not a substitute for your prescriber's advice. Learn more about Alula.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Alula is a dietary supplement, not a GLP-1 medication. Talk with your healthcare provider before starting any new supplement.
Frequently asked questions
Does Zepbound have fewer side effects than Wegovy?
In their separate trials, Zepbound's reported rates of nausea, vomiting, and diarrhea were lower than Wegovy's, but the trials were designed differently, so the numbers are not a direct comparison. Individual experience varies a lot. Your prescriber can help you weigh the options.
When are side effects worst?
For both medications, digestive side effects are most common during the first weeks and after each dose increase, then tend to ease.
Can I switch if I can't tolerate one?
Some people do switch between GLP-1 medications. That is a decision to make with your prescriber, who can also adjust your dose or pace.