Trulicity vs Mounjaro
Dulaglutide vs Tirzepatide — Eli Lilly's Two Diabetes Injections (2026)
Trulicity (dulaglutide) and Mounjaro (tirzepatide) are both once-weekly Eli Lilly injections for type 2 diabetes — but Mounjaro is the newer, stronger dual-mechanism drug. Many patients switch from Trulicity to Mounjaro. Here's how they compare.
Trulicity vs Mounjaro: At a Glance
- ✓GLP-1 receptor agonist
- ✓Once-weekly injection (hidden-needle auto-injector)
- ✓FDA-approved for type 2 diabetes
- ✓Effective HbA1c reduction; modest weight loss
- ✓Simple, no pen titration needed
- ✓Eli Lilly
- ✓Dual GLP-1/GIP receptor agonist
- ✓Once-weekly subcutaneous injection
- ✓FDA-approved for type 2 diabetes
- ✓SURPASS: superior HbA1c and large weight loss
- ✓Zepbound is the obesity-branded twin
- ✓Eli Lilly
Detailed Comparison
| Feature | Trulicity (Dulaglutide) | Mounjaro (Tirzepatide) |
|---|---|---|
| Generic | Dulaglutide | TirzepatideBest |
| Manufacturer | Eli Lilly | Eli Lilly |
| Mechanism | GLP-1 agonist | GLP-1 + GIP dual agonist |
| Indication | Type 2 diabetes | Type 2 diabetes |
| Administration | Once-weekly injection | Once-weekly injection |
| HbA1c Reduction | Effective | Greater (SURPASS program) |
| Weight Effect | Modest | Large (tirzepatide) |
| Obesity Twin | None | Zepbound |
| Device | Hidden-needle auto-injector | Single-dose pen / vial |
| Side Effects | Nausea, diarrhea | Nausea, diarrhea, constipation |
How to Choose
Stronger Results
Tirzepatide (Mounjaro) generally lowers HbA1c more and produces far more weight loss than dulaglutide thanks to its dual GLP-1/GIP mechanism.
Easiest Device
Trulicity's auto-injector hides the needle and needs no priming — a plus for needle-averse patients.
Weight Goal
If weight loss matters, Mounjaro (or its obesity twin Zepbound) is much stronger than Trulicity.
Switching Up
Moving from Trulicity to Mounjaro is a common step-up under medical guidance for patients needing better control.
Tolerability
Both cause GI side effects; Mounjaro's stronger effect can mean more nausea during titration. Slow titration helps.
Cost & Coverage
Formulary and savings programs vary. Mounjaro may require step-therapy on some plans. Check coverage for both.
Which Should You Choose?
Mounjaro (tirzepatide) is the more powerful of the two Lilly drugs: its dual GLP-1/GIP mechanism produces greater HbA1c reduction and substantially more weight loss than Trulicity (dulaglutide). For patients who need better glucose control or who also want significant weight loss, Mounjaro is generally the stronger option, and switching from Trulicity to Mounjaro is a common move.
Trulicity keeps two practical advantages: an exceptionally easy hidden-needle auto-injector, and a gentler effect that some patients tolerate more comfortably. For someone well-controlled and happy on Trulicity, there may be no reason to change.
If weight loss is a primary goal, remember that tirzepatide's obesity-indicated brand is Zepbound. Whatever you take, track your dose, weight, glucose, and side effects in Shotlee — clean data makes any switch easy to evaluate.
Trulicity vs Mounjaro: Frequently Asked Questions
For glucose control and weight loss, yes — tirzepatide (Mounjaro) generally outperforms dulaglutide (Trulicity) because of its dual GLP-1/GIP mechanism. Trulicity's advantages are its very easy auto-injector and tolerability for some patients.
Both are once-weekly Eli Lilly injections for type 2 diabetes. Trulicity is dulaglutide (GLP-1 only); Mounjaro is tirzepatide (dual GLP-1/GIP), which is more potent for glucose and weight.
Yes, switching is common under medical guidance for patients needing better control or more weight loss. Your prescriber will set a starting Mounjaro dose and titration plan. Track both in Shotlee to compare.
Mounjaro (tirzepatide) produces far more weight loss than Trulicity (dulaglutide). For weight loss specifically, tirzepatide's obesity brand Zepbound is the on-label option.
Yes. Shotlee tracks any GLP-1 — dulaglutide and tirzepatide included — with dose logs, weight, glucose, and side-effect tracking, ideal for evaluating a switch.
Track Trulicity or Mounjaro in Shotlee
Free dose logging, weight, glucose, and side-effect tracking for any GLP-1.