Question

Why viral medicines are difficult to make as compare to bacterial one?
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Answer 1

Antibacterial medicines and vaccines works on the principle of destroying the bacterial cell wall. As bacteria's have cell walls of their own with definite chemical composition, it's easy to make another chemical which degrade them.

BUT

Viruses rely on human cell machinery to copy themselves, virus do not have any mechanism of their own. They do not have a cell wall. If we apply an antiviral that may affect the inner workings of healthy human/ host cells too.