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DR Medhat MRCP

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Measurement of plasma drug level :<br />

- Drug concentration varies in plasma between doses if given intermittent ,being<br />

lowest just before the next dose (=trough level)<br />

- Examples :<br />

Drug T 1/2 (hours) Aim of<br />

monitoring<br />

Digoxin 36 h. Therapeutic<br />

or toxic?<br />

Phenytoin 6-24 h. Therapeutic or<br />

toxic?<br />

Lithium 22 ± 8 h. Therapeutic or<br />

toxic?<br />

Gentamycin 2-3 h. Therapeutic or<br />

toxic ?<br />

Timing of meassurment<br />

At least 6 hours after the<br />

dose or just before the<br />

dose<br />

Just before next dose<br />

(trough level)<br />

Time to reach<br />

steady state<br />

7 days (longer<br />

in RF )<br />

≥ 7 days<br />

12 hours after the dose 3-7 days<br />

Trough : just before next<br />

dose<br />

Peak : 30 min post dose<br />

12-40 hours<br />

(longer in RF)<br />

19

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