Question

why antibiotics should not be overused?
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Answer 1

Answer:

because it can also kill our body's useful bacteria

Answer 2

we know that generally that excess of anything harms. It's Harmful to Overuse Them Frequent and inappropriate use of antibiotics can cause bacteria or other microbes to change so antibiotics don't work against them. This is called bacterial resistance or antibiotic resistance. Treating these resistant bacteria requires higher doses of medicine or stronger antibiotics.