| NOUN | act | phase IV, phase IV clinical trial | sometimes the FDA approves a drug for general use but requires the manufacturer to continue to monitor its effects |
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| Meaning | sometimes the FDA approves a drug for general use but requires the manufacturer to continue to monitor its effects; during this phase the drug may be tried on slightly different patient populations than those studied in earlier trials. | |
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| Synonym | phase IV clinical trial | |
| Broader | clinical trial, clinical test | A rigorously controlled test of a new drug or a new invasive medical device on human subjects |
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