Ozempic tracker app
Ozempic is semaglutide, dosed once weekly, with a half-life of about 7 days (168 hours). That single number drives everything a tracker needs to get right: when the next dose is due, how much is still in you if you run late, and why a missed dose is not simply skipped. Bo logs your doses, maps your injection sites, models your estimated level from the published pharmacokinetics, and scans your meals with GLP-1-specific guidance. Free to download.
What a Ozempic tracker should do
- Remember the schedule, not just the dose. Ozempic is once weekly, and weekly is exactly the interval people lose track of.
- Rotate injection sites. The FDA label specifies abdomen, thigh or upper arm with rotation each dose. Why site does not change absorption →
- Handle a late dose sensibly. The labels describe roughly a 48-hour boundary for weekly injectables. What the labels actually say →
- Do the math if you use vials. Pens are pre-measured; compounded vials are not, and getting units wrong is the one error that matters. Free calculator →
- Track what you eat. Appetite is the mechanism, so food logging is not a side feature on a GLP-1.
Levels between doses
With a 7 days (168 hours) half-life and once weekly dosing, semaglutide never fully clears between injections — each dose stacks on what remains until levels plateau, which takes about 35 days (840 hours) of continuous dosing. Peak concentration arrives around 2 days (48 hours) after the shot, not the same day, which is why side effects often show up a day or two late.
Bo draws that curve from your own logged doses using these constants, and shows the sources behind them. See the semaglutide half-life page → · Injection date calculator →
The options
Bo is my app, so here is the honest version. If you take Ozempic as a branded pen and nothing else, Shotsy or MeAgain are larger, longer-established and perfectly good. Bo is the better fit when you also log vial-based peptides, when you take other peptides alongside it, or when you want the dose countdown on your Lock Screen. Bo has no cloud backup and no Android version — if either matters, choose one of the others.
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.