On this device only

Vial Log

A vial comes out of the fridge many times after the calculator has read its mark once. This keeps the mark for the dose you entered, counts your withdrawals against the label, and shows which date ends first. It never proposes a dose, a volume or a time.

How it works

Calculatewith the label in hand, then tap "Keep this vial" under the mark

Add the datesfrom the carton: the printed expiry, and when you mixed or first punctured it

Log each withdrawalconfirming the syringe each time; undo if you tapped by mistake

What it will not do

It will not tell you when to inject, how much, or whether a vial that has reached its date is still fine. Those questions belong to your prescriber and your pharmacist. What it shows is arithmetic on your own entries and the words on the label, and every number says which of the two it came from.

Where the data lives

In your browser, on this device. Nothing is sent to us, including the dose, and these pages send no analytics. Clearing browser data deletes the log, so make a backup file now and then; it contains health information, so keep it somewhere private. On iPhone, Safari can delete a site's data after seven days without a visit unless the site is added to the home screen: how to install.

Arithmetic only, not a dose recommendation. This converts the numbers you typed and nothing more. If anything here does not match your prescription or your label, stop and ask your pharmacist.

Full notice

This tool does not choose or check a medication, dose, concentration, diluent, syringe or route. It works from the numbers on your prescription and label, as you type them. A mark on a U-100 syringe is a volume, not a medication dose in units or IU. If anything here differs from what you were given, or you are unsure, do not prepare or inject: ask the prescriber or the dispensing pharmacist. No preset is a dose. Presets exist for FDA-approved products; any other vial is arithmetic on your own label.