Tirzepatide (Mounjaro / Zepbound)
Street names: Mounjaro, Zepbound, GIP/GLP-1, Twincretin
⚡What it does
- Appetite suppression via dual GIP + GLP-1 receptor activation — the strongest weight-loss drug class as of 2026 (trials: ~20% of body weight at the top dose)
- Slower stomach emptying — early fullness, quieter 'food noise'
- Improved blood sugar control in type 2 diabetes
⚠Key risks
- The #1 target of GLP-1 counterfeiting after semaglutide — fake Mounjaro/Zepbound pens seized across the US, UK and EU with wrong doses, wrong drugs, or bacterial contamination
- Compounded and grey-market versions are not interchangeable with the approved pen — dose errors are common
- Nausea, vomiting and diarrhea are the norm in the first weeks; dehydration follows heavy GI loss
- Gallbladder disease, pancreatitis (rare) and muscle loss without adequate protein and resistance training
- Weight returns after stopping — this is a long-term medicine, not a course
✚Overdose signs
- Severe, unrelenting vomiting or diarrhea leading to dizziness and fainting (dehydration)
- Severe upper-abdominal pain radiating to the back (pancreatitis — emergency)
- Confusion and weakness from inability to keep fluids down
Category comparison — Weight Loss & Metabolic Meds
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| Tirzepatide (Mounjaro / Zepbound) | Rx-only | The #1 target of GLP-1 counterfeiting after semaglutide — fake Mounjaro/Zepbound pens seized across the US, UK and EU with wrong doses, wrong drugs, or bacterial contamination; Compounded and grey-market versions are not interchangeable with the approved pen — dose errors are common | ~$25–60 per weekly pen equivalent on grey markets |
| Liothyronine (T3) | Rx-only — not controlled | At abuse doses: cardiac arrhythmia, heart failure, bone loss; Muscle catabolism — the 'cut' comes with your muscle | ~$0.50–$2 per tablet grey-market |
| Levothyroxine (T4) | Rx-only — not controlled | Overtreatment = hyperthyroid state: palpitations, anxiety, bone loss; Taking it without hypothyroidism provides little benefit at real risk | ~$0.10–$0.50 per tablet |
| Orlistat (Xenical/Alli) | OTC | Oily stools, urgency, flatulence — the famous GI sides if you eat fatty; Fat-soluble vitamin absorption drops (take a multivitamin) | ~$0.50–$2 per capsule |
| Sibutramine (Meridia) | Withdrawn | WITHDRAWN worldwide for cardiovascular events (strokes, heart attacks in the SCOUT trial); Survives in adulterated supplements — buyers don't know they're taking it | ~$0.50–$2 per capsule illicit |
| Metformin | Rx-only — not controlled | GI upset (diarrhea, nausea) — titrate slowly; Lactic acidosis — rare, dangerous, mostly in kidney disease | ~$0.05–$0.30 per tablet |
?Frequently asked questions
What does Tirzepatide (Mounjaro / Zepbound) look like?
Single-dose injection pen (2.5–15 mg weekly) for the real drug; grey-market 'research' vials and lyophilized powder for the counterfeits
What are the signs of a Tirzepatide (Mounjaro / Zepbound) overdose?
Severe, unrelenting vomiting or diarrhea leading to dizziness and fainting (dehydration); Severe upper-abdominal pain radiating to the back (pancreatitis — emergency); Confusion and weakness from inability to keep fluids down Call emergency services immediately.
How addictive is it?
The #1 target of GLP-1 counterfeiting after semaglutide — fake Mounjaro/Zepbound pens seized across the US, UK and EU with wrong doses, wrong drugs, or bacterial contamination Dependence can develop with regular use.
🔗Sources & further reading
Facts on this page are compiled from these primary sources. External links open in a new tab.