The majority of the reported events occurred in patients who had experienced gastrointestinal reactions leading to dehydration such as nausea, vomiting, or diarrhea
Most compounding pharmacies assign a 28-day beyond-use date from the first puncture
Even if you feel nothing at 2.5 mg, your body is adapting metabolically

Tirzepatide reconstitution by vial size (units assume U-100 insulin syringes) Vial 5 mg BAC water 1.0 mL Concentration 5 mg/mL 2.5 mg 0.50 mL / 50 u 5 mg 1.00 mL / 100 u 7.5 mg 10 mg 15 mg Vial 10 mg BAC water 1.0 mL Concentration 10 mg/mL 2.5 mg 0.25 mL / 25 u 5 mg 0.50 mL / 50 u 7.5 mg 0.75 mL / 75 u 10 mg 1.00 mL / 100 u 15 mg Vial 10 mg BAC water 2.0 mL Concentration 5 mg/mL 2.5 mg 0.50 mL / 50 u 5 mg 1.00 mL / 100 u 7.5 mg 10 mg 15 mg Vial 15 mg BAC water 1.5 mL Concentration 10 mg/mL 2.5 mg 0.25 mL / 25 u 5 mg 0.50 mL / 50 u 7.5 mg 0.75 mL / 75 u 10 mg 1.00 mL / 100 u 15 mg 1.50 mL / split Vial 40 mg BAC water 2.0 mL Concentration 20 mg/mL 2.5 mg 0.125 mL / 12.5 u 5 mg 0.25 mL / 25 u 7.5 mg 0.375 mL / 37.5 u 10 mg 0.50 mL / 50 u 15 mg 0.75 mL / 75 u Vial 40 mg BAC water 3.0 mL Concentration 13.33 mg/mL 2.5 mg 0.188 mL / 18.8 u 5 mg 0.375 mL / 37.5 u 7.5 mg 0.563 mL / 56.3 u 10 mg 0.75 mL / 75 u 15 mg 1.125 mL / split Vial 60 mg BAC water 3.0 mL Concentration 20 mg/mL 2.5 mg 0.125 mL / 12.5 u 5 mg 0.25 mL / 25 u 7.5 mg 0.375 mL / 37.5 u 10 mg 0.50 mL / 50 u 15 mg 0.75 mL / 75 u 20 mg/mL keeps 40 mg and 60 mg vial setups within a 3 mL vial-capacity ceiling while keeping the listed doses compact

With pen devices like Ozempic or Wegovy, this is physically difficult or impossible since the pens are designed to deliver fixed doses
Selection of patients : It may be that benefits are strongest in those with early metabolic dysfunction, mild cognitive impairment, or early Alzheimers disease, rather than in advanced dementia