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Is There a Place for Drug Combination Strategies Using Clinical Pharmacology Attributes? - Review of Current Trends in Research

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Drug discovery is the main flag ship of the pharmaceutical industry in order to ensure that innovations constantly occur in the identification and development of novel therapeutic options for the management of diseases. Recently, research trends that take advantage of the safety and efficacy of marketed products by combining such products with other agents to influence certain clinical pharmacology attribute(s) have emerged. The focus of the review is to evaluate ongoing research trends that have considered leveraging on certain clinical pharmacology attributes in the areas of viral infection (HIV and influenza) and oncology. Case studies discussed in this review include: a) the use of probenecid to block the organic anion renal transport of oseltamivir carboxylate (a key active metabolite of oseltamivir phosphate) to reduce the oral dose of oseltamivir phosphate; b) the use of rifampicin to induce the CYP2C19 enzyme and thereby, promote the formation of a potent active metabolite M8 (nelfinavir hydroxyl-t-butylamide) and achieve sustained blood levels to combat HIV infection along with ritonavir; c) the use of CYP3A4 inhibitors such as ketoconazole, cyclosporin A, ritonavir etc to overcome the extensive presystemic metabolism of docetaxel and enhance the oral bioavailability of docetaxel. Along with the case studies, several hurdles for drug development such as dose selection, frequency of dosing, and duration of the clinical studies, picking the right surrogate(s) for efficacy, evaluation of drug-drug interaction potential with other cosubstrates have been discussed in line with the current day requirements for a sound clinical and regulatory strategy. In summary, based on the collated information, a pragmatic approach would render feasibility for a balanced therapy management using combined clinical pharmacology attributes of drugs.

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Document Type: Research Article

Publication date: September 1, 2009

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  • Current Clinical Pharmacology publishes frontier reviews on all the latest advances in clinical pharmacology. The journal's aim is to publish the highest quality review articles in the field. Topics covered include: pharmacokinetics; therapeutic trials; adverse drug reactions; drug interactions; drug metabolism; pharmacoepidemiology; and drug development. The journal is essential reading for all researchers in clinical pharmacology.
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