Clinical Trials

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<tr><td>[[Phase I]]</td><td>20 - 100</td><td>Several months</td><td>Mainly safety</td><td>70 percent</td></tr>
<tr><td>[[Phase I]]</td><td>20 - 100</td><td>Several months</td><td>Mainly safety</td><td>70 percent</td></tr>
<tr><td>[[Phase II]] </td><td>100 - 500 </td><td>Several months to 2 years</td><td>Some short-term safety, but mainly effectiveness </td><td>33 percent</td></tr>
<tr><td>[[Phase II]] </td><td>100 - 500 </td><td>Several months to 2 years</td><td>Some short-term safety, but mainly effectiveness </td><td>33 percent</td></tr>
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<tr><td>[[Phase III]] </td><td>Several hundred to several thousand  </td><td>1 - 4 years  </td><td>Safety, effectiveness, dosage </td><td>25 - 30 percent</td></tr>
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<tr><td>[[Phase III]] </td><td>1000 - 8000 </td><td>1 - 4 years  </td><td>Safety, effectiveness, dosage </td><td>25 - 30 percent</td></tr>
<tr><td>[[Phase IV]]</td></tr></table>
<tr><td>[[Phase IV]]</td></tr></table>

Revision as of 08:52, 31 July 2008

Clinical Trials involve the following Phases

Testing in Humans

Number of Patients DurationPurposePercent of Drugs Successfully Tested
Phase I20 - 100Several monthsMainly safety70 percent
Phase II 100 - 500 Several months to 2 yearsSome short-term safety, but mainly effectiveness 33 percent
Phase III 1000 - 8000 1 - 4 years Safety, effectiveness, dosage 25 - 30 percent
Phase IV