Calculating drug steady state achieved (hours)
The steady state of drug intake regards a constant mean concentration of a drug in which the elimination and absorption of the drug is equal. The time to achieve steady state is relying on the half-life of the drug. This formula can be used to quickly assess how long it would take to achieve steady state.

Mostly, 4-5 half-lives are used to achieve clinical steady state
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Time to achieve steady state is hours

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If the time to achieve steady state is longer than desired, an initial loading dose of a drug can be administered to reach the desired blood concentration quickly.
Note: The loading dose is based on the volume of distribution and the maintenance dose is based on the half-life of the drug administered. 

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