Catherine, you do not need a 30-day washout period. In clinical practice, requiring a 30-day gap is an outdated practice that provokes severe rebound hyperphagia, intense food noise, and weight regain.
Both Semaglutide and Tirzepatide share a 5 to 7 day elimination half-life. The evidence-based 7-Day Switch Protocol is:
1. Take your final 2.4 mg Semaglutide dose on your regular injection day.
2. Seven days later, administer your first dose of Tirzepatide.
Starting Dose for 2.4 mg Semaglutide Patients:
You should initiate Tirzepatide at 5.0 mg or 7.5 mg maximum.
*Why not 10 mg or 15 mg?* Even though you have developed high tolerance to GLP-1 receptor stimulation, Tirzepatide introduces dual GIP (glucose-dependent insulinotropic polypeptide) agonism, which is a brand-new receptor pathway for your body. Starting at 10 mg or 15 mg causes acute, intractable vomiting and dehydration. Starting at 5.0 mg or 7.5 mg maintains appetite suppression while allowing your stomach to adapt.
Read our complete transition guide: Cross-Titration: Switching from Semaglutide to Tirzepatide.