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| | After a treatment has been approved and is being marketed, it is studied in a phase IV trial to evaluate side effects that were not apparent in the phase III trial. Thousands of people are involved in a phase IV trial. |
| Previous Definitions: | phase I/II trial, phase II detoxification, phase II trial, phase II/III trial, phase III trial | | Next Definitions: | phenethyl isothiocyanate, phenobarbital, phenol, phenothiazine, phenoxodiol |
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