Tirzing is a personal tracking tool — not a medical device, a pharmacy, or a healthcare provider. This calculator estimates medication levels with a mathematical model. It has never met you.
By accepting below, you acknowledge and agree that Tirzing, its owners, operators, employees, and affiliates are not responsible or liable for any harm, injury, loss, or damage arising from your use of this tool, including from any error, inaccuracy, or omission in its estimates or calculations. You accept full responsibility for independently verifying all calculations, doses, and concentrations with the product label and a qualified healthcare professional before acting on them. To the fullest extent permitted by law, you release, waive, and hold harmless the foregoing parties from any and all liability, claims, demands, or causes of action of any kind, and you waive any right to bring legal action against them in connection with your use of this tool.
If you do not agree, do not use this calculator.
Titrating up between shots? Here's what to take today.
You took 5 mg on Monday. It's Wednesday and you've decided to move to 7.5 mg. You can't just take 7.5 mg, because you'd be stacking it on four days of what's still in you. And "the difference" (2.5 mg) is only right by coincidence.
This works out the one dose that lands you exactly where the new dose wants you, without going over the peak you'd have hit anyway, and shows you the working, so you can check it rather than trust it.
This is an estimate for personal tracking, not medical advice. It models your medication level with a one-compartment (Bateman) curve using published average half-lives. Your body isn't average, and the model doesn't know your history, your side effects or your prescriber's plan. Dose changes are a conversation to have with them, not with a web page.
Here you're typing your history in from memory. In the app it already knows every shot, and every dose change, so your medication-level curve, supply runway and titration plan all come from the real thing.