This summary information on persistence, bioaccumulation and toxicity comes from Fass. The risk comes from the report by Goodpoint.
Persistence. Simvastatin is degraded in the environment.
Bioaccumulation. Simvastatin has high potential for bioaccumulation.
Toxicity. Simvastatin has very high chronic toxicity.
Risk. More fat-soluble statins (simvastatin, atorvastatin) may be quite potent and (together with ezetimibe) represent a slightly higher risk than the others, but the levels in the environment are probably well below the concentrations that give rise to effects in Sweden.
Summary of Product Characteristics for Zocord (simvastatin), date of review of the SPC 2018-05-07. The main metabolites of simvastatin in human plasma are beta-hydroxy acid and four additional active metabolites. Following an oral dose of radioactive simvastatin in humans, 13% of the radioactivity is excreted in the urine and 60% in the faeces within 96 hours. The amount found in faeces consists of absorbed substance and metabolites excreted in bile and unabsorbed drug.
Fass environmental information for Zocord from MSD (downloaded 2021-06-28).
Persistence: "Simulation Studies (OECD 308) (XIII): DT50 in water: 5–5.8 days; DT50 in sediment: 19.2–25 days; DT50 in total system: 5.6–7.8 days. [...] Because the OECD 308 study demonstrated a DT50 ≤ 32d for the total system, the summary phrase “Simvastatin is degraded in the environment” was selected."
Bioaccumulation: Log Kow = 2 at pH 7 (OECD 107). Since log Kow < 4 the substance has low potential for bioaccumulation.
Toxicity: There are data for 3 trophic levels, most sensitive crustacean NOEC 21-dagar (reproduction) = 2 microg/L.
PEC/PNEC is based on sales data in Sweden in year 2018. PEC/PNEC = 0.32 which gives the risk low.
Fass environmental information for Simvastatin Teva by Teva (downloaded 2021-06-28).
Persistence: No data.
Bioaccumulation: LogP = 4.68. If Log P > 4 at pH 7 the substance has high potential for bioaccumulation.
Toxicity: No data.
The risk of environmental effects of simvastatin cannot be excluded when ecotoxicological data are missing.
Report Pharmaceutial residues in the Stockholm aquatic environment. Simvastatin has been detected in the effluent from wastewater treatment plants at concentrations <5 <250 ng/L.
According to the report, if possible, simvastatin hydroxy acid and other active metabolites should be measured in wastewater.
Comparative assessment of environmental risk when using simvastatin, atorvastatin, rosuvastatin, pravastatin and ezetimibe from a Swedish perspective.
Although there are knowledge gaps in particular regarding relevant toxicity studies, there is no obvious environmental risk with any of the investigated substances in Swedish water given the current state of knowledge. No exchanges are therefore recommended from an environmental point of view. The risk seems entirely insignificant for the highly water-soluble substance rosuvastatin. More fat-soluble statins (simvastatin, atorvastatin) may be quite potent and (together with ezetimibe) represent a slightly higher risk than the others, but the levels in the environment are probably well below the concentrations that give rise to effects. However, more impact studies are needed. For ezetimibe and pravastatin, efficacy data are even more deficient. For pravastatin, however, the risk was assessed based on its relatively low fat solubility (and thus the ability to accumulate in biota) in relation to its potency in humans. Ezetimibe is more fat-soluble, but at least partially separated in the wastewater treatment plants, how much is unclear due to high detection limits. Based on measured bioconcentration potential, there is some, but low risk for this substance.
Author: Health and Medical Care Administration, Region Stockholm