Naltrexone/Bupropion (Contrave) vs Tirzepatide (Mounjaro / Zepbound)
Both are used for gut health. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| Naltrexone/Bupropion (Contrave) | Tirzepatide (Mounjaro / Zepbound) | |
|---|---|---|
| Human evidence | ★★★★☆ | ★★★★★ |
| Legal status | FDA Approved | Prescription |
| How it works | Bupropion stimulates hypothalamic POMC neurons (dopamine/norepinephrine reuptake inhibition); naltrexone (opioid µ-receptor, OPRM1 antagonist) blocks POMC's auto-inhibition — together sustaining appetite/craving suppression. | Dual agonist of GIPR (GIP receptor) and GLP1R. GIP receptor activation in the hypothalamus and adipose tissue synergises with GLP-1, producing greater appetite suppression and fat loss than GLP-1 alone. |
| In plain English | Targets the brain's reward/craving circuit rather than gut fullness — useful for emotional or reward eating. Modest (~5–9%) loss. | Hits two "I'm full" gut-hormone switches at once instead of one — so it works even better. SURMOUNT-1: 22.5% bodyweight lost, approaching bariatric-surgery territory. |
| Bottom line | Reasonable non-GLP-1 option, especially for craving-driven eating. | Currently the most effective approved obesity drug. |
| Availability | Available over the counter | Prescription only |
Which is better for gut health?
Tirzepatide (Mounjaro / Zepbound) has the stronger human-evidence rating (★★★★★ vs ★★★★☆), but the right choice still depends on your goal, tolerance and budget.
Full breakdowns: Naltrexone/Bupropion (Contrave) · Tirzepatide (Mounjaro / Zepbound).
Common questions
Is Naltrexone/Bupropion (Contrave) or Tirzepatide (Mounjaro / Zepbound) better for gut health?
Tirzepatide (Mounjaro / Zepbound) has the stronger human-evidence rating (★★★★★ vs ★★★★☆), but the right choice still depends on your goal, tolerance and budget.
What's the difference between Naltrexone/Bupropion (Contrave) and Tirzepatide (Mounjaro / Zepbound)?
Naltrexone/Bupropion (Contrave): Reasonable non-GLP-1 option, especially for craving-driven eating. — Tirzepatide (Mounjaro / Zepbound): Currently the most effective approved obesity drug.