Next injection date calculator
Pick your medication and the date of your last shot; the calculator returns your next due date, how late the label allows you to be, and the earliest you could shift your injection day. The intervals come straight from the FDA labels — weekly means exactly 7 days for semaglutide, tirzepatide and dulaglutide — and the "still in your system" estimate uses the same published half-lives as the half-life chart.
Calculator
Dates come from your medication's labelled schedule; they are planning arithmetic, not a prescription. If you are unsure about a late or missed dose, the person to ask is your prescriber.
How the dates are worked out
Weekly medications are dosed every 7 days on the same weekday; daily ones every 24 hours. The percentage-remaining figure is a single-dose estimate using the published half-life (for example about 7 days (168 hours) for semaglutide), so on a repeating schedule your true level is higher because doses stack. How clearance actually works →
Changing your injection day
The labels permit moving your weekly day as long as two doses stay far enough apart: at least 48 hours for semaglutide (Ozempic, Wegovy) and at least 72 hours for tirzepatide (Mounjaro, Zepbound) and dulaglutide (Trulicity). The calculator shows the earliest allowed date for your medication.
If you missed a dose
Semaglutide: take it within 5 days, otherwise skip. Tirzepatide: within 4 days (96 hours), otherwise skip. Never take two doses to catch up. What the labels say in full →
Stop counting days by hand
Bo schedules every dose, reminds you before it is due, shows the countdown on your Lock Screen, and models what is still in your system between shots — with the sources behind every number.
Educational information only. Bo is a tracking app, not a medical device, and nothing here is medical advice, a dosing recommendation, or a substitute for your prescriber. Half-lives are population averages from the sources cited on each row; individual clearance varies with body weight, kidney and liver function, and other medication.