# Module 3.5: OneCompartDilantin

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This model shows the concentration of the drug Dilantin, a drug for
epilepsy, that patients take on a regular basis. The stock, drug in
system, represents the initial mass of Dilantin in the body, which is
0. The flow, ingested, represents the does of the drug that is
ingested. This model uses a pulse function to represent the periodic
nature of dosage. The pulse function looks like this in the ingested
flow: `Pulse(doseage,start,interval)` where dosage, start and interval
are all terms. The pulse function is multiplied by an absorption
fraction of .08. The ingested flow then goes into the drug in the
system stock.

The pink term for concentration is the amount of the stock, drug in
the system/volume. The graph and the table represent concentration
over time. Volume is a term with the value 2000.

The elimination flow is proportionate to drug in system * elimination
constant. The elimination constant is similar to the elimination
constant in the OneCompartAspirin model. Elimination constant =
-Math.log(.5)/half_life. The half-life is 22 hours.

This model has terms for minimum effective concentration (MEC) and
minimum toxic concentration (MIC) for comparison purposes.