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Clinical Pharmacokinetics of Fentanyl and its Newer Derivatives

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Abstract

Fentanyl, a synthetic opiate with a (clinical) potency of 50 to 100 times that of morphine, was introduced into clinical practice in the early 1960s. Usually administered by single intravenous doses, it developed a reputation for having a short duration of action and it was assumed that this was a consequence of rapid removal from the body. However, as clinical experience increased, it was realised that administration of multiple doses or large doses during narcotic-based anaesthesia sometimes led to delayed recovery and prolonged respiratory depression, suggesting that the duration of action was limited by redistribution within the body rather than removal from the body. Recent developments in analytical techniques have allowed pharmacokinetic studies and these have confirmed this opinion; fentanyl is rightly regarded as having a redistribution-limited duration of action after single or infrequent doses (analogous to thiopentone). However, the magnitude of the pharmacokinetic constants reported for fentanyl are remarkably inconsistent even in healthy volunteers, for reasons apparently only explainable by assay differences. Hence, estimates of apparent volume of distribution (area) range from around 60L to over 300L, estimates of terminal half-life range from about 1.5 to 6 hours (15 hours in geriatric patients) and total body clearance ranges from 0.4 to over 1.5 L/min. Renal excretion accounts for up to 10% of the dose; the remainder of the clearance would appear to be predominantly hepatic, but with contributions from other tissues.

Continued clinical developments of narcotic-based anaesthetic techniques have resulted in high doses of narcotic being used, with oxygen, as the sole anaesthetic agents. At present these techniques are usually based on fentanyl, and the technique is frequently called ’stressfree anaesthesia’ because of the effects in obtunding the ’stress response’ caused by surgery (elevation of plasma concentrations of cortisol, glucose, ADH, etc. in the intra- and postoperative period) and the lack of deleterious effects on the cardiovascular system.

With the hypothesis that increased potency is associated with increased specific opiate effects and decreased nonspecific cardiovascular depressant effects, chemical congeners of fentanyl were developed. Alfentanil has about one-third the (clinical) potency of fentanyl, while sufentanil has about 5 to 10 times the (clinical) potency of fentanyl. Lofentanil and carfentanil have about 20 to 30 times the potency of fentanyl and have yet to find clinical roles.

Alfentanil is characterised by a rather small apparent volume of distribution for a base (Varea = 40-70L), short terminal half-life (100 minutes), intermediate total body clearance (0.3–0.5 L/min) and negligible renal clearance. Sufentanil would appear to have pharmacokinetic properties intermediate to those of alfentanil and fentanyl.

At physiological pH, approximately 15 to 20% of fentanyl is unbound in plasma compared with 5 to 10% of alfentanil, sufentanil and lofentanil. Except for alfentanil, there is a marked plasma binding dependence on pH. Also except for alfentanil, there is a predominance of ionised drug species and a high octanol: water partition coefficient in the physiological pH range. These factors act to influence the tissue binding of the agents and reflect back on other important factors such as uptake by blood cells. Whole blood: plasma concentration ratios of 0.97, 0.63, 0.74 and 0.71 have been reported for fentanyl, alfentanil, sufentanil and lofentanil, respectively.

The range of opiate duration of action has been extended by the appearance of these newer compounds, where alfentanil may be regarded as having an ultrashort duration of action, fentanyl and sufentanil as short acting, while lofentanil has a long duration of action. Knowledge of the pharmacokinetic properties of these agents has provided more information than could be obtained from clinical studies alone, and has added a basis on which to rationalise and enhance their usefulness.

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Mather, L.E. Clinical Pharmacokinetics of Fentanyl and its Newer Derivatives. Clin Pharmacokinet 8, 422–446 (1983). https://doi.org/10.2165/00003088-198308050-00004

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