After a drug or medication serves its purpose in the body sometimes it sticks around or when it gets removed from the body it goes into wastewater. That can have negative impact and is usually studied. Recreational drugs can end up in the water supply, some drugs end up in our waste and fish are very sensitive to it.
“Afterlife” describes the drug (or the chemicals resulting from the drug) after it has been used in humans or animals and is excreted. Pharmaceuticals or their byproducts are found when testing waterways relatively often. Which can harm the ecosystem and also poise issues for water treatment.
Like a big one I know is that steroid byproducts from contraceptives (such as birth control) seem to interfere with the development of young fish and aquatic amphibians like frogs.
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