Drug Stability, Third Edition, Revised, and Expanded: by Jens T. Carstensen, Christopher Rhodes

By Jens T. Carstensen, Christopher Rhodes

Every thing made via human hands—from the elegant Parthenon to the trivial milkshake—is topic to decay. prescribed drugs are not any exception to this common assertion. If there's any functionally appropriate caliber characteristic of a drug product that adjustments with time, overview of this alteration falls in the purview of the pharmaceutical scientists and regulators who quantify drug product balance and shelf existence. Describing the documentation required to lessen the adjustments of regulatory citations, the booklet lists brands of photostability trying out chambers, balance procedure software program, and laboratory info administration structures for pharmaceutical purposes.

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The Zero-Order Reaction 24 3. First-Order Reactions 25 4. 1. 2. Parallel reactions 27 27 29 5. 1. Steady-state situations 30 33 6. Pseudo-Zero-Order Reactions 34 7. 2. 3. Eyring plots 37 39 41 42 45 8. 1, Equal initial concentration. 2. Pseudo-first-order reactions 9. Complicated HydrolysisSchemes 46 52 52 53 References 54 lability is not synonymous with chemical kinetics, yet most of the rate-limiting phenomena are either associated with chemical reactions or aredescribable by some equation system that bears a resemblance to those encountered in chemical kinetics.

1999). 2. 3. C. M. Won, Pharm. Res. 9:131-137,1992. 4. J. T. Carstensen, C. T. Rhodes. Drug Devel. Indus. Pharm. 19:2709-2714,1993, 5, S. E. Tabibi, C. Rhodes. In: Modern Pharmaceutics. G. S. Banker, C. T. Rhodes, eds. New York: Marcel Dekker, 1995. 6. The Handbook of Pharmaceutical Excipients, 2nded. American P ~ a r ~ a c e u t i cAssocial ation and the Royal Pharmaceutical Association of Great Britain, 1996, 1 7 . M. Ash, I. Ash. Handbook of Pharmaceutical Additives. Gower, Croft Road, England, 1995.

1988) reaction, with the equilibrium occurring between A and B. Ghebre-Sellassie et al. (1984) have described the epimeri~ationof benzylpenicilloic acidin alkaline media and shown it to be an equilibrium between5R,6R-benzylpenicilloicacidwith pena~aldicacid (enamine). Table 5 and Fig. 7 show data by Farraj et al. (1988) showinga leveling effect. 0055 and the data areplotted in this fashion in Fig. 8, but it should be underscored that they have simply been used as an example. The alkaline hydrolysis of chlorambucil (Owen and Stewart, 1979) isanother example of an equilibrium situation.

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