This summary information comes from Fass.
Persistence. Prasugrel is degraded in the environment.
Bioaccumulation. Prasugrel has low potential for bioaccumulation
Toxicity. Prasugrel has moderate chronic toxicity.
Risk. The use of prasugrel (sales data Sweden 2016) has been considered to result in insignificant environmental risk.
Assessment report for Efient (prasugrel) Doc.Ref.: EMEA/117561/2009.
"Environmental chemistry, fate and effects data were collected for prasugrel as recommended in the Guideline for environmental risk assessment of medicinal products for human use (CHMP/SWP/4447/00). The Phase I estimate of maximum exposure to all prasugrel residue in surface water predicted an exposure above the 0.01 µg/L and thus, a complete risk assessment (Phase II Tier A) according to the current guideline has been conducted. No likely risk has been identified with regard to aquatic organisms in either ground water or surface water, neither for sediment dwelling organisms."
"A complete environmental risk assessment has been conducted for prasugrel. No likely risk has been identified for aquatic organisms in either ground water or surface water, or for sediment dwelling organisms."
Fass environmental information for Efient from Daiichi Sankyo Nordics (downloaded 2021-01-19).
Persistence: "Because the calculated DT50 values from the total water-sediment systems were less than one day and because the hydrolysis of prasugrel is rapid (2,29 days or less), prasugrel is considered to be degraded in the environment."
Bioacumulation: "The log Kow was measured to be 2,27, 3,80, and 5,66 at pH values of 4, 7, and 9, respectively (Study 1982.6226, based on OECD 107). Prasugrel is an ionic compound for which the measured log Kow increases over the environmental range. The measured log Kow of prasugrel at pH 7 is less than 4 and, therefore, indicates that prasugrel is not expected to bioaccumulate in the environment. While log Kow is greater at higher pH values, prasugrel’s rapid degradation to more polar entities as well as its extensive metabolism to more polar metabolites, support the conclusion that prasugrel has low potential for bioaccumulation."
Chronic toxicity: There are data for 3 trophic levels, most sensitive "Fathead minnow (Pimephales promelas) (OECD 210) NOEC 5 d embryos + 28 d larvae (mortality, growth) = 190 μg/L."
PEC/PNEC is based on sales data in Sweden in year 2016. PEC/PNEC = 0.00001 which gives the risk insignificant.
Author: Health and Medical Care Administration, Region Stockholm