Retatrutide is an investigational drug being developed by Eli Lilly for weight loss and other metabolic conditions.
Here’s some information about Retatrutide:
Dosage information
- The 8mg dosage of Retatrutide was studied in a Phase 2 clinical trial involving adults with obesity.
- Participants were randomized to receive various doses, including those that reached 8 mg once weekly for 48 weeks.
- The phase 2 trial findings showed that the average weight loss was approximately 22.8% in the combined 8 mg groups after 48 weeks.
Mechanism of action
Retatrutide is a “triple G” or triple hormone receptor agonist that works by mimicking three hunger-regulating hormones: glucagon-like peptide 1 (GLP-1), glucose-dependent insulinotropic polypeptide (GIP), and glucagon. This approach is thought to offer a more potent effect on appetite and food satisfaction compared to medications targeting fewer hormones.
Potential benefits
- In addition to significant weight loss, the Phase 2 trial revealed that Retatrutide might offer other health benefits, such as improvements in blood pressure and indicators of blood sugar, including glycated hemoglobin, insulin, and fasting glucose.
- It also reduced liver fat in patients with metabolic dysfunction-associated steatotic liver disease (MASLD), with the 8mg dose leading to an 81.7% decrease in liver fat at 48 weeks.
Side effects
- The most commonly reported side effects in the Retatrutide clinical trials were gastrointestinal symptoms like nausea, vomiting, diarrhea, and constipation.
- These side effects were typically mild to moderate in severity and were often dose-related, meaning they were more pronounced at higher doses and when the dose was escalated too quickly.
FDA approval status
- Retatrutide is not currently approved by the FDA for any indication.
- It is still in the clinical trial phase, with Phase 3 trials ongoing.
- Topline results from the Phase 3 trials are expected in late 2025, with potential FDA submission in 2026 and retail availability possible in 2027.
Important considerations
- Using Retatrutide outside of a clinical trial setting is illegal and potentially dangerous due to the lack of FDA approval and safety oversight.
- Beware of compounded or research-grade Retatrutide being sold online, as these products may be of unknown quality and potentially unsafe.
Always consult with a qualified healthcare provider before considering any new weight loss therapy or medication.



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