Why do doctor prescribe drug for a cource?

why do we take medicine contiously for 2 or 3 days
Answers:
Most drugs are eliminated from your body---some swiftly, some not so quickly. Many drugs (e.g., antibiotics) take time to do their thing. If the time needed for the drug to do its entity is longer than the amount of time that it stays in your body, then you have to save taking more of it.
What's a "cource"?

You need to take all the meds to insure adjectives the invading 'bodies' in you are killed off.

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