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Clinical Trials

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PHASES OF CLINICAL TRIALS

Introduction

Clinical Trial
Definition:

“Clinical trial” means a systematic study of new drug(s) in human subject(s) to generate data for discovering and / or verifying the clinical, pharmacological (including pharmacodynamic and pharmacokinetic) and /or adverse effects with the objective of determining safety and / or efficacy of the new drug. “

Drug Development Process:

The process of drug development can be broadly classified as pre-clinical and clinical
Pre- clinical refers to experimentation that occurs before it is given to human subjects; whereas, clinical refers to experimentation with humans. Within the realm of clinical research, clinical trials are classified into four phases.

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Classification of Various phases of clinical trials:

There are five different phases of clinical trials, which include: ➢ Phase 0 Trials (Micro dosing trials) ➢ Phase I Trials (Human Pharmacology/ First time in Man Studies) ➢ Phase II Trials (Pilot Trials/ Therapeutic Exploratory trials) ➢ Phase III Trials ( Expanded clinical trials/Therapeutic Confirmatory trials) ➢ Phase IV Trials ( Post Marketing trials)

1. Phase 0 Trails/Micro dosing Trials:

Micro dosing, or human phase 0 clinical trials, is a technique whereby sub pharmacological doses of prospective drug candidates are administered to human volunteers. A micro dose study provides early pharmacokinetic data in humans and only requires minimal preclinical toxicology safety testing’

A micro dose is defined as 100th of the pharmacological dose (or predicted pharmacological dose) or a maximum of 100μg. Micro dosing is a relatively recent innovation and there remains a degree of uncertainty as to whether such a small dose will adequately predict the pharmacokinetics of the therapeutically active dose

Distinctive features include

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