Principles of Paediatric Pharmacology by George M. Maxwell (auth.)

By George M. Maxwell (auth.)

Pharmacology is key for therapeutics. this can be good recognized within the box of inner drugs, for which pharmacological textbooks abound. Paediatric pharmacology even if, has mostly been seen as a subsection of basic medication. this can be flawed: it's going to be obvious as a separate and critical entity. This e-book is written from the point of view of a paediatrician, however it is addressed to all who've accountability for the care of youngsters, parti­ cularly physicians and pharmacists. because the latter may perhaps lack familiarity with definite illnesses of youngsters, i've got further a medical appendix in sure pertinent parts. My process in each one bankruptcy has been to teach the interdependence of body structure and pharmacology. therefore I make no apology for delivering a physiological evaluate for many subject matters. every one bankruptcy is fairly self-contained. i've got presumed majority of readers will usually pass on to that part appropriate to their fast specifications, and hence i've got occasionally needed to restate small print in additional than one position. however, for the canopy­ to-cover reader, there'll no longer be an way over repetition. given that this isn't a textbook of grownup therapeutics, there'll be no dialogue of things like coronary vasodilators. Likewise, the obstetric pharmacology of parturition has been passed over, even supposing i've got completely lined the pharmacological difficulties of the fetus and the newborn. i'm enormously obliged to generations of my scholars, either below­ graduate and postgraduate.

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Example text

This is clinically relevant in the reversal of opioid effects (see p. 129). Thus, nalorphine is an opioid which is a partial morphine agonist. In the presence of high concentrations of morphine, it will act to reduce the morphine effect to its own level. Thus, it will, for example, reduce the degree of morphine-induced respiratory depression. Dose-response Relationships of Drugs in Patients General Factors. 10 are simple responses such as may be found in any experiment on a muscle strip. In the patient such Simplicity may not be found, and many possible dose-effect relationships can be graphed.

Thus, a drug which produces 100 per cent response is an agonist. There may be several agonists of the same type - say /3-adrenergic agonists - which have varying affinity for the receptor and this can be determined by plotting the log concentration/ response curve. Affinity is defined as the concentration needed to produce a 50 per cent response: the lower the value, the higher the affinity. Similarly, the intrinsic activity is that response which is produced by a drug at very high concentrations.

Thus, a drug which is relatively rapidly eliminated, or has a short t% can have its effect maintained by giving a larger dose. This technique, however, is only useful if very high concentrations do not 54 Elementary Pharmacokinetics and Pharmacodynamics produce side effects; thus it can be used for penicillin dosage, but not for aminoglycosides, since the fonner is well-tolerated, but the latter are relatively toxic. The action of drugs is not only related to dose, but to the speed and extent of absorption.

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