This summary information comes from Fass 2015 and the risk is from the report from Goodpoint.
Persistence. Erythromycin is potentially persistent.
Bioaccumulation. Erythromycin has low potential for bioaccumulation.
Toxicity. Erythromycin has very high acute toxicity. However, studies on blue-green algae (Cyanophyta) according to CHMP guidelines are lacking.
Risk. See below.
Fass environmental information for Abboticin Novum (erythromycin) from Amdipharm (downloaded 2020-10-20).
Persistence: No data.
Bioaccumulation: No data.
Toxicity: No data.
PEC = 0.055558 microg/L. The environmental risk could not be calculated since ecotoxicity data are missing.
The manufacturer, Amdipharm, has on fass.se (2020-10-20) stated that data about the environmental impact is missing for the substance so that the environmental risk cannot be calculated. It is voluntary for manufacturers to provide information on the environmental impact on fass.se.
Fass environmental information for Ery-Max (erythromycin) from Meda (downloaded 2015-09-07).
Persistence: "Erythromycin did not pass the criteria for readily biodegradability. Closed Bottle Test (OECD 301D) resulted in <60% degradation in 28 days. Erythromycin did not pass the criteria for ready biodegradability, which justifies the phrase “Erythromycin is potentially persistent”."
Bioaccumulation: "Log Kow of 3.06 (unknown method)."
Toxicity: There are data for 3 trophic levels, most sensitive green algae (Selenastrum capricornutum) "NOEC 72h (growth inhibition): 0.0103 mg/L (OECD 201)". However, studies on blue-green algae (Cyanophyta) according to CHMP guidelines are lacking.
PEC/PNEC is based on sales data in Sweden during 2018 (Fass environmental information above from Amdipharm. PEC = 0.055558 microg/L). "PNEC is calculated as lowest NOEC (Algae)/AF = 0.0103 (mg/L)/100" which gives the value 0,103 microg/L. "Chronic NOEC data for the most sensitive species justifies an assessment factor (AF) of 100 according to ECHA guideline." According to ECHA guidelines, AF 100 can be used if there are long-term EC10 or NOEC values for either fish or crustaceans. Such data have not been found. Based on AF 100, PEC/PNEC = 0.539, which gives the risk low.
If AF 1000 is used (at least one value for L(E)C50 from the three trophic levels: algae, crustaceans and fish), PEC/PNEC = 5.39, which gives the risk moderate.
In selection of algae for toxicity testing of antimicrobials the European Medicines Agency, EMA, recommends test on blue-green algae (cyanobacteria). No information on toxicity on blue-green algae has been found, which means that a calculation of environmental risk becomes uncertain.
Erythromycin is on the EU's list of substances for which concentrations in surface water should be monitored in the Member States for environmental reasons. There is a risk of selection for antibiotic resistance with the concentrations measured in Swedish wastewater treatment plants.
Erythromycin is included in Region Stockholm's table of pharmaceuticals with risk for negative environmental impact according to the environmental programme 2017–2021. Erythromycin has been detected in treated wastewater in Region Stockholm.
Erythromycin is on the EU's watchlist of substances whose concentrations in groundwater should be monitored in the Member States for environmental reasons.
Studies have shown that even low concentrations of antibiotics in the environment may trigger antibiotic resistance and therefore, as little as possible should end up in our environment.
Erythromycin is recommended in the Wise list. Environmental classification of pharmaceuticals is taken into consideration, sometimes with other environmental aspects, when selecting pharmaceuticals for the Wise list. When comparable pharmaceuticals are equivalent to medical effects, safety and pharmaceutical efficacy, environmental impact and price are considered.
Concrete proposals on how to work to reduce emissions of environmentally harmful pharmaceuticals on the list have been developed in close cooperation with the Stockholm Drug and Therapeutics Committee's expert groups. The action proposals were developed from an environmental perspective. The patient's best always goes first and several pharmaceuticals on the list are also included in the Wise list. However, for such pharmaceuticals, there may be measures that could reduce the environmental impact.
Concrete proposal for erythromycin
Author: Health and Medical Care Administration, Region Stockholm