The internet continues to harbour thousands of rogue online pharmacies.1 We investigated the success of their practice by measuring the sewage load of the erectile dysfunction drug sildenafil in three cities in the Netherlands. We measured concentrations of sildenafil and two metabolites at the three main sewage treatment plants serving Amsterdam, Eindhoven, and Utrecht for seven consecutive days. …
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Venhuis et al. (2014) studied this question.
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