basic

Plasma Drug Elimination Calculator

Concentration after N hours of first-order elimination.

Compute the remaining plasma concentration of a drug after a number of hours of first-order elimination, using C = C₀ · (½)^(t/t½). Useful for thinking through "how much is left after the next dose-free interval".

Priya Venkatesan By Priya Venkatesan
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

mg/L
h
h

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

C = C₀ · (½)^(t / t½)

In depth

Compute the remaining plasma concentration of a drug after a number of hours of first-order elimination, using C = C₀ · (½)^(t/t½). Useful for thinking through "how much is left after the next dose-free interval".