Tons of drug residues are dumped into the sea each year. These are mostly metabolites from medicine regimens that patients take either at home or in a hospital setting. Hormones, antibiotics, pain killers and anti-depressive drugs constitute the bulk of the drug residues found in the maritime ecological system. These have also been shown to be very harmful for fish and other animals in that habitat. Antibiotics are of great concern, because they increase antibiotic resistance in the ecosystem, which will ultimately affect the resistance of bacteria involved in infectious diseases in humans. Consequently, the European Union has published a watch list of drugs known to be harmful for the maritime ecological system and is preparing a regulation to restrict the amount of drug residues in waste water.