Define a drug. What are the characters of an ideal drug?

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Solution

Drug is a substance which is used for the purpose of diagnosis, prevention, cure or relief of a disease.
The characters of an ideal drug:
(i) It should not disturb physiological processes.
(ii) It should be harmless to host but should destroy harmful organisms.
(iii) It should be localized to affected site.
(iv) It should have minimum side effects.

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