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The study also revealed that the South Korean Viagra market grew from $33 million to $45 million from 2012 to 2019. Apart from Viagra, South Korea has more than 50 other erectile-dysfunction drugs on the market that are produced by domestic pharmaceutical companies. As per the researchers, the levels of the erectile-dysfunction drugs were so high that the sewage-treatments plants were unable to properly filter them out of the wastewater. Kim Hyunook, professor at the University of Seoul’s environmental engineering school who was one of the authors of the study, told the South China Morning Post that the existing sewage facilities are ‘not suitable’ to filter out drugs consumed by humans. As a part of the study, the researchers analyzed water samples from two sewage-treatment plants in Seoul.

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