Comparative studies to verify the effectiveness of diagnostic, therapeutic, or prophylactic drugs, devices, or techniques determined in phase II studies. During these trials, patients are monitored closely by physicians to identify any adverse reactions from long-term use. These studies are performed on groups of patients large enough to identify clinically significant responses and usually last about three years. This concept includes phase III studies conducted in both the U.S. and in other countries.

Descriptor ID	D017326
MeSH Number(s)	E05.318.760.535.220 E05.337.250.220 N05.715.360.775.235.220 N06.850.520.450.535.220
Concept/Terms	Clinical Trials, Phase III as Topic Clinical Trials, Phase III as Topic Clinical Trials, Phase 3 as Topic Evaluation Studies, FDA Phase III as Topic Evaluation Studies, FDA Phase III as Topic Drug Evaluation, FDA Phase III as Topic Drug Evaluation, FDA Phase 3 as Topic Evaluation Studies, FDA Phase 3 as Topic

Below are MeSH descriptors whose meaning is more general than "Clinical Trials, Phase III as Topic".

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Below are MeSH descriptors whose meaning is more specific than "Clinical Trials, Phase III as Topic".