How to Use Trofinetide
Complete guide to Trofinetide dosing, administration, timing, and protocol recommendations.
Quick Overview
Trofinetide is a synthetic version of a tiny three-amino-acid fragment (glycine-proline-glutamate) that the body clips off IGF-1. It is the first drug ever approved for Rett syndrome: the FDA approved it as Daybue in March 2023 for patients 2 years and older, Health Canada followed in October 2024, and the EU authorised it as Daybu in August 2026 after first refusing it. It is a real, approved medicine with a real but modest effect, and the trade-off is blunt: most patients get diarrhea, and a meaningful share stop because of it.
Dosing Guidelines
Common Dose
5-12 g twice daily, set by body weight (labeled dose)
Frequency
Twice daily, morning and evening
Dose Range
5,000-12,000 mg per dose; up to 24 g per day
Note: These are labeled prescription doses for Rett syndrome. They are gram-level oral doses, nothing like the microgram injections typical of research peptides. Laxatives are stopped before starting, and the prescriber adjusts or pauses the dose for diarrhea or weight loss. There is no validated use outside Rett syndrome.
Administration Method
Oral solution (200 mg/mL) by mouth or via gastrostomy tube; also available as a powder (Daybue Stix) mixed into liquid
Best Time to Take
Morning and evening, as prescribed
The label specifies twice-daily dosing, morning and evening. The short half-life (about 1.5 hours) is why it is split into two doses.
Protocol Duration
Ongoing for the approved indication; dose is interrupted, reduced, or stopped for severe diarrhea, dehydration, or significant weight loss
Possible Side Effects
Not everyone experiences these. Individual responses vary.
- •Diarrhea (about 80% in the pivotal trial; the main reason people stop)
- •Vomiting (about 27-29%)
- •Weight loss (12% lost more than 7% of body weight in the pivotal trial)
- •Decreased appetite
- •Fever
Frequently Asked Questions
What is the recommended dose for Trofinetide?
5-12 g twice daily, set by body weight (labeled dose)
How do you administer Trofinetide?
Oral solution (200 mg/mL) by mouth or via gastrostomy tube; also available as a powder (Daybue Stix) mixed into liquid
When is the best time to take Trofinetide?
Morning and evening, as prescribed
How long should you use Trofinetide?
Ongoing for the approved indication; dose is interrupted, reduced, or stopped for severe diarrhea, dehydration, or significant weight loss
This information is for educational purposes only. Always consult with a healthcare professional before using any peptide. Dosing information is based on research literature and community reports, not medical advice.