Tirzepatide 10 mg reconstitution calculator

Before you add anything, read the whole strength line. Zepbound and Mounjaro come as a 10 mg/0.5 mL single-dose pen or vial (20 mg/mL), one 10 mg dose. They also come as a 10 mg/2.4 mL multi-dose vial or KwikPen (4.17 mg/mL), which holds four 2.5 mg doses of 0.6 mL (Zepbound label, Mounjaro label). Both are ready-made liquids, and no tirzepatide label mentions adding bacteriostatic water, so “10 mg Zepbound” needs none. Only a 10 mg vial of powder needs water, and that vial is compounded or unapproved. Compounded drugs aren’t FDA-approved, and the FDA doesn’t verify their safety, effectiveness or quality (FDA).

Each unit on a U-100 syringe is 0.01 mL, so what it holds depends on the water. A mixed 10 mg vial holds 0.1 mg per unit with 1 mL, 0.05 mg with 2 mL and 0.04 mg with 2.5 mL: the same syringe mark holds 2.5 times as much at 1 mL as at 2.5 mL. The labeled 10 mg/2.4 mL vial (4.17 mg/mL) is about 0.0417 mg per unit. That is close to the 2.5 mL mix but not equal to it, and well below the 1 mL and 2 mL mixes. Its label gives each dose as 0.6 mL and names a syringe that can measure 0.6 mL, such as a 1 mL syringe, not a number of units (Zepbound label). So units from one 10 mg vial never carry over to another. Work them out again from the mg your prescriber gave you whenever the product or the water changes, and use the tirzepatide units calculator to check your syringe.

For multi-dose vials of compounded GLP-1s, the FDA says to throw the vial away within 28 days of first use, even if medicine is left and even if the compounder’s instructions say it lasts longer, because the risk of contamination rises after 28 days. It also says to use a new, sterile needle and syringe for every dose, and not to use an injectable GLP-1 that arrives warm or poorly refrigerated (FDA). A 10 mg vial may be empty well before then, but write the date you first pierce it on the label either way. If your shipment arrives warm, call the pharmacy before you mix.