Semaglutide vs Tirzepatide
Semaglutide (Ozempic/Wegovy) and tirzepatide (Mounjaro/Zepbound) are the two GLP-1 medications people compare most often for weight loss. Both can work well, but they differ in results, side effects, cost, approvals, and access. Here is the plain-English version to review before you talk with your prescriber.
“Tirzepatide produces modestly greater weight loss on average (20–22% vs 15–17%), but semaglutide has a longer safety track record and is more widely available. For most people starting GLP-1 therapy, either is an excellent choice — the best option depends on your tolerance for side effects, cost, and availability.”
Semaglutide
FDA ApprovedHelps you feel full sooner, keeps food in the stomach longer, and supports blood sugar control.
Tirzepatide
FDA ApprovedActs on GLP-1 and GIP pathways, which can lead to stronger appetite reduction and higher average weight loss.
Head-to-Head Comparison
Who Should Choose Which?
Choose Semaglutide if…
- First-time GLP-1 users
- People with cardiovascular risk
- Those needing compounded access
- PCOS weight management
Choose Tirzepatide if…
- People who tried semaglutide and want more results
- Higher starting BMI
- Type 2 diabetes management
- Sleep apnea
Side Effects
Semaglutide
- Nausea (most common)
- Constipation
- Vomiting
- Fatigue
- Hair loss (temporary)
- Pancreatitis risk (rare)
Tirzepatide
- Nausea
- Diarrhea (more common vs semaglutide)
- Vomiting
- Constipation
- Fatigue
Frequently Asked Questions
Is tirzepatide stronger than semaglutide?
In head-to-head clinical data, tirzepatide produces roughly 5–7% greater average weight loss (20–22% vs 15–17%). However, individual response varies significantly. Some people achieve better results on semaglutide.
Can I switch from semaglutide to tirzepatide?
Switching is a clinician-managed decision. Your prescriber can account for your current medication, tolerance, side effects, insurance, and timing before making any change.
Which has worse side effects — semaglutide or tirzepatide?
Both cause similar GI side effects (nausea, constipation). Tirzepatide may cause slightly more diarrhea in some patients. Semaglutide may cause slightly more nausea early on. Neither is dramatically "worse" — it's individual.
Which is cheaper — semaglutide or tirzepatide?
Brand prices are similar ($900–$1,400/mo). Compounded versions of both are significantly cheaper ($200–$450/mo). Semaglutide compounding has been available longer and may be slightly more accessible.
Which is better for PCOS?
Semaglutide has more research for PCOS specifically. Tirzepatide trials in PCOS are ongoing. Either can help — consult an endocrinologist or obesity medicine specialist for your specific case.
Which is better for muscle preservation?
Neither drug is specifically designed for muscle preservation. Protein intake, resistance training, sleep, and clinician follow-up matter more than choosing between these two medications for that goal.
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