Zepbound and Wegovy are both FDA-approved for weight loss. They use different drugs, which means their side effect profiles differ slightly.
Quick Comparison
| Zepbound | Wegovy | |
|---|---|---|
| Active drug | Tirzepatide | Semaglutide |
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Most common side effect | Nausea | Nausea |
| Injection | Once weekly | Once weekly |
Most Common Side Effects
Both medications cause similar gastrointestinal side effects. Here's how they compare:
| Side Effect | Zepbound | Wegovy |
|---|---|---|
| Nausea | Very common | Very common |
| Diarrhea | Common | Common |
| Vomiting | Common | Common |
| Constipation | Common | Common |
| Stomach pain | Common | Common |
| Decreased appetite | Very common | Very common |
| Fatigue | Common | Common |
| Headache | Less common | Less common |
| Dizziness | Less common | Less common |
Key Differences
Zepbound hits two hormone receptors (GLP-1 and GIP). Some people report stronger GI side effects because of the dual action. Others find it gentler.
Wegovy hits one hormone receptor (GLP-1). It has been on the market longer, so we have more real-world data on its side effects.
When Side Effects Hit Hardest
For both medications:
- Week 1-2: Side effects are usually worst when you first start
- After dose increases: Side effects often flare up again for a few days
- Weeks 3-4: Most people start adjusting at each dose level
- Long-term: Side effects usually decrease over time
Managing Side Effects
Tips that work for both medications:
- Start at the lowest dose and increase slowly
- Eat smaller meals
- Avoid greasy or heavy foods
- Stay hydrated
- Take your shot at night so you sleep through the worst of it
- Talk to your doctor if side effects don't improve
Serious Side Effects (Rare)
Both medications carry warnings for:
- Thyroid tumors (seen in animal studies)
- Pancreatitis
- Gallbladder problems
- Kidney issues
- Allergic reactions
These are rare but serious. Seek medical help if you experience severe stomach pain, persistent vomiting, or signs of an allergic reaction.
Which Has Worse Side Effects?
There's no clear winner. Some people tolerate Zepbound better. Others tolerate Wegovy better. It depends on your body.
In clinical trials, the rate of people stopping treatment due to side effects was similar for both medications.
Bottom Line
Both medications cause similar side effects. Zepbound may cause slightly more GI issues because it hits two hormone receptors, but many people tolerate it just fine.
The best medication is the one your body handles well. Talk to your doctor about which makes sense for you.
Work with your healthcare provider to determine which medication is right for you. Individual results and experiences vary.