Enter your vial size and bacteriostatic water, then the weekly dose in milligrams. The calculator works out the concentration and the units to draw on a U-100 syringe.
Reviewed for accuracy · Last reviewed July 7, 2026The example mixes a 10 mg vial with 2 mL of water for 5 mg/mL, where a 5 mg dose is 1 mL, or 100 units. Past 5 mg at this concentration the volume no longer fits one 100-unit syringe, so many people remix stronger as the dose climbs.
The approved weight-management product (Zepbound) starts at 2.5 mg once weekly and increases no sooner than every 4 weeks to a maximum of 15 mg. Independently sourced vials carry no guarantee of the purity or accuracy testing a regulated pharmacy product does.
This page is an independent educational reference and is not medical advice. Talk to a doctor before starting or adjusting any compound.