Studies in this Phase aim to show that the new drug has some of the desired clinical activity ( e. g., that an experimental antihypertensive drug actually has some effect on reducing blood pressure ), that it can be tolerated when given to humans, and to give guidance as to dose levels that are worthy of further study.

Studies in this Phase aim to show that the new drug has a useful amount of the desired clinical activity ( e. g., that an experimental antihypertensive drug reduces blood pressure by a useful amount ), that it can be tolerated when given to humans in the longer term, and to investigate which dose levels might be most suitable for eventual marketing.

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