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While a drug may be used for various functions, it becomes effective only if it is taken for a specific function. |
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Despite various other uses, a drug usually has a function for a special effect. |
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The functions expected of a drug are various even if it is used for a specific disease. |
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However effective a drug may be, its functions have to be several. |
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A drug is taken for a specific purpose, but it may have a range of other effects. |