Comparisons Tirzepatide vs Liraglutide

Tirzepatide vs Liraglutide

Side-by-side comparison of weight loss results, pricing, side effects, and clinical data.

Tirzepatide

~22%

Liraglutide

~8%

Head-to-Head Comparison

Metric
TirzepatideMounjaro / Zepbound
LiraglutideVictoza / Saxenda
Drug Class
GLP-1/GIP dual agonist
GLP-1 RA
Administration
Weekly injection
Daily injection
Dosing
Once weekly
Once daily
Avg. Weight Loss
~22%
~8%
Half-Life
~5 days
~13 hours
Compounded Cost
$150-450/mo (compounded)
$100-300/mo (compounded)
Brand Cost
$1,000-1,200/mo
$1,300-1,500/mo
FDA Approved
2022
2014
Key Trial
SURMOUNT-1 (22.5% weight loss)
SCALE (8% weight loss)

Side Effects Comparison

Tirzepatide

  • Nausea
  • Diarrhea
  • Decreased appetite

Liraglutide

  • Nausea
  • Diarrhea
  • Constipation

Pros & Cons

Tirzepatide

Pros

  • +Greatest weight loss of any GLP-1
  • +Dual mechanism
  • +Weekly dosing

Cons

  • -Newest with least long-term data
  • -No oral option

Liraglutide

Pros

  • +Longest safety record
  • +Daily dosing for fine adjustment
  • +Approved for adolescents

Cons

  • -Daily injections
  • -Significantly less weight loss
  • -First-generation GLP-1

The Verdict

Tirzepatide achieves nearly three times the weight loss of liraglutide (~22% vs ~8%) with the added convenience of weekly dosing. Liraglutide remains an option for patients who need the longest safety track record or adolescent approval.

No direct head-to-head trial. Cross-trial comparisons show tirzepatide achieves approximately 2.5-3x the weight loss.

Which Is Right for You?

Choose Tirzepatide if...

Patients seeking maximum weight loss with a next-generation medication

Choose Liraglutide if...

Adolescents or patients requiring the most-studied first-generation GLP-1

Frequently Asked Questions

How much more weight loss does tirzepatide cause vs liraglutide?

Based on clinical trial data, tirzepatide produces roughly 22% body weight loss compared to about 8% for liraglutide — nearly three times as much.

Is liraglutide still worth taking?

Liraglutide can still be a good option for patients who want the longest-studied GLP-1, prefer daily dosing flexibility, or cannot access newer medications.

Can you switch from Saxenda to Mounjaro?

Yes, with your doctor's guidance. You would stop Saxenda and start Mounjaro at the lowest dose (2.5mg weekly), then titrate up over several months.

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