GLP-1 calculator
Compounded GLP-1 calculator
A compounded vial is a concentration, not a metered pen. Enter vial mg, BAC mL, and dose to see the units to draw.
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The plunger marks the correct draw for your target — even in check mode, so the picture never reinforces a wrong planned draw.
Math runs in your browser. No account, nothing sent anywhere, nothing stored. Reconstitution numbers do not transfer between vials — these are computed from the vial and volume you entered.
Need label verification, BUD and refill timing, and a concentration sanity-check? The GLP-1 vial reality check takes it from here.
What it checks
- › mg, mL, units translation
- › Concentration and BUD
- › Titration step in units
- › GLP-class stop flags
When it helps
- › Your vial lists concentration, not dose
- › You switched pharmacy or program
- › You are mapping a pen schedule to a vial
What it won’t verify
- › Pharmacy compounding quality
- › Salt or form equivalence
- › Pharmacy licensing status
Reading a COA for a vial? Use the manual COA literacy checklist. No upload, no verification, no pass mark.
The mistake it prevents
A compounded vial is not the FDA-approved brand product, and it is not the pen. The pen meters each dose while the label and prescriber set the titration. A compounded multi-dose vial only gives you a concentration, and that concentration can differ by pharmacy and by batch.
Reusing a semaglutide-style pen titration (0.25, then 0.5, then 1 mg) on a compounded vial copies the milligrams but not the draw. The units that deliver 0.25 mg depend entirely on the concentration in your vial.
See the math
The brand pen hides this by metering the dose for you. A vial does not. The same 0.25 mg is a different draw at each pharmacy concentration, so pen clicks and unit directions do not transfer until you recompute them.
Before you switch or draw
- Read mg/mL, BUD, and lot from the compounded label
- Do not reuse pen clicks or unit directions without recomputing them
- Recompute units every time the pharmacy or batch changes
- GLP-class stop rules apply, including pancreatitis and gallbladder; the checker screens more
Protoche is a checker, not a prescriber. Use it to catch math, source-lane, and stop-rule problems before you make a decision with a licensed clinician or before you decide to pause.