+Drug resistance occurs when a pathogen or cancer cell can no longer be inhibited or killed by a drug that was previously effective. This renders vital treatments ineffective, posing a significant challenge in [Medicine](/wiki/medicine) and public health, often driven by [Evolution](/wiki/evolution).
+## See also
+- [Antibiotic Resistance](/wiki/antibiotic_resistance)
+- [Chemotherapy](/wiki/chemotherapy)
+- [Pathogen](/wiki/pathogen)
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