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Direct answer: the graph is a mathematical estimate, not a blood-level measurement.

The calculator applies a simplified first-order elimination model to the entered half-life and schedule. Real absorption, formulation behavior, metabolism, and individual concentration can differ.

Concentration
Dose injections
Steady-state level
Half-life used
SS peak
at steady state
Trough / peak
at steady state
Steady state
~5 half-lives
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Record your protocol and model assumptions

The iOS app logs injections and renders live estimated concentration curves for 44 compounds using citation-backed pharmacokinetic parameters — on-device, no account required.

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How the Half-Life Estimate Works

This calculator applies a simplified one-compartment, first-order elimination model to the half-life, amount, interval, and dose count entered. It illustrates a mathematical pattern; it does not measure blood concentration, absorption, effectiveness, or safety.

Single-dose estimate: remaining amount = initial amount × 0.5^(elapsed time ÷ half-life)
Repeated-dose estimate: sum the estimated remainder from each prior entered dose

Worked Example

Hypothetical example: with an entered starting amount of 100 and a five-day half-life, the model shows 50 after five days, 25 after ten days, and 12.5 after fifteen days. These are relative model units, not measured clinical concentrations.

How to Use This Calculator

  1. 1Select or enter a half-life and verify its route, formulation, species, and evidence source.
  2. 2Enter an amount and interval only to explore the mathematical pattern.
  3. 3Compare scenarios without interpreting the curve as an individualized measurement or dosing instruction.

What the Model Does Not Include

  • Route-specific absorption time, formulation release, or injection-site effects.
  • Multiple distribution compartments, active metabolites, protein binding, or nonlinear elimination.
  • Individual physiology, laboratory measurements, symptoms, clinical response, or interactions.
  • Evidence that an entered schedule is appropriate, safe, or effective.

Use the compound database and public dataset to inspect source-level half-life statements and evidence labels before selecting a value.

Frequently Asked Questions

Is the displayed level an exact blood concentration?

No. It is a simplified estimate based on entered assumptions.

What does estimated steady state mean?

It is the model point where repeated-dose peaks and troughs approach a repeating mathematical pattern.

Can this result be used to change a dose?

No. A consumer model cannot determine an appropriate dose or schedule.