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For example, gentamicin is an antibiotic that can be nephrotoxic (kidney damaging) and ototoxic (hearing damaging); measurement of gentamicin through concentrations in a patient's plasma and calculation of the AUC is used to guide the dosage of this drug. [3] AUC becomes useful for knowing the average concentration over a time interval, AUC/t.
There are various competing calculation methods for the drug accumulation ratio, yielding somewhat different results. A commonly used formula defines R ac as the ratio of the area under the curve (AUC) during a single dosing interval under steady state conditions to the AUC during a dosing interval after one single dose: [1]
If the observed concentration is plausible but far from the suitable level, determine how to adjust the dosage to drive the concentration curve close to target. Several approaches exist for this, from the easiest “rule of three” to sophisticated computer-assisted calculations implementing Bayesian inference algorithms based on population ...
The dose required should be monitored by blood testing. [5] Gentamicin can cause inner ear problems and kidney problems. [5] The inner ear problems can include problems with balance and hearing loss. [5] These problems may be permanent. [5] If used during pregnancy, it can cause harm to the developing fetus. [5]
In these cases, clearance is almost synonymous with renal clearance or renal plasma clearance. Each substance has a specific clearance that depends on how the substance is handled by the nephron. Clearance is a function of 1) glomerular filtration , 2) secretion from the peritubular capillaries to the nephron , and 3) reabsorption from the ...
It is possible to calculate the amount of a drug in the blood plasma that has a real potential to bring about its effect using the formula: D e = B ⋅ D a {\displaystyle De=B\cdot Da\,} where De is the effective dose , B bioavailability and Da the administered dose.
Some investigators have proposed dosing based on surface area (S) instead of V, but clinicians usually measure the URR and then calculate Kt/V. One can "adjust" the Kt/V, to calculate a "surface-area-normalized" or "SAN"-Kt/V as well as a "SAN"-standard Kt/V. This puts a wrapper around Kt/V and normalizes it to body surface area. [8]
In pharmacokinetics, a maintenance dose is the maintenance rate [mg/h] of drug administration equal to the rate of elimination at steady state. This is not to be confused with dose regimen , which is a type of drug therapy in which the dose [mg] of a drug is given at a regular dosing interval on a repetitive basis.
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