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This summary information comes from Fass and the risk from the report from Goodpoint.


Persistence. Diclofenac is slowly degraded in the environment
Bioaccumulation. Diclofenac has low potential for bioaccumulation
Toxicity. Diclofenac has moderate chronic toxicity.
Risk. See below.


Diclofenac is not recommended in the Wise list (a list of recommended pharmaceuticals from the Stockholm Drug and Therapeutics Committee).


Suggestions on how to reduce the emissions of diclofenac

Detailed information

Fass environmental information

Fass environmental information for Voltaren (diclofenac) from Novartis (downloaded 2020-10-20) with environmental risk calculated from sales data 2018. Fass environmental information from GlaxoSmithKline Consumer Healthcare (2020-10-20) is also available but the environmental risk there is calculated from sales data 2016.


Persistence: "While the results from Kunkel 2008 would even justify the statement "diclofenac is degraded in the environment", the fact that no standard OECD308 study is available has led to a more conservative assumption."

Bioaccumulation: BCFss = 3–5 (OECD305, 1996; Harlan Laboratories Study D24068).
BCF (plasma) = 5–11 "(mean measured plasma concentration/mean exposure concentration in rainbow
trout (Oncorhynchus mykiss) exposed to sewage effluents at three sites) (Brown et al., 2007)."
BCF (plasma) = 2.5–29 "(measured fish plasma levels/average measured water concentration after 14 days of exposure) (Fick et al., 2010)."

Chronic toxicity: There are NOEC for 3 trophic levels, lowest NOEC for fish (OECD210, Danio rerio, 34 days) 0.32 mg/L.


PEC/PNEC is based on sales data in Sweden in year 2018. PEC/PNEC = 0.03 which gives the risk insignificant, i.e. consideration has not been given to measured levels in the environment.

Report Goodpoint 2019

Comparative assessment of environmental risk when using diclofenac, naproxen, ibuprofen, ketoprofen, etoricoxib, celecoxib and paracetamol from a Swedish perspective (Report Goodpoint 2019). From an environmental risk point of view, the exchange of diclofenac is recommended for any of the other investigated NSAIDs/analgesics. [...] Paracetamol is a very safe alternative from an environmental point of view. The others are also considered to pose low environmental risk, but slightly increased for ketoprofen. The risk factors for ketoprofen, naproxen, ibuprofen, celecoxib, etoricoxib and paracetamol are not considered so great that an exchange with another substance is recommended. Environmental measurements as well as efficacy studies of both celecoxib and etoricoxib are required."

Other information

The acute toxicity to aquatic organisms is assessed as high. Due to the risk of ecotoxicity in water, diclofenac has previously been monitored within the framework of EU water legislation. There is now enough data to assess whether diclofenac is to be proposed as a priority substance when the European parliament and the Council next time proposes a revised directive regarding priority substances in the field of water policy. For Sweden, the Swedish Agency for Marine and Water Management has diclofenac among special pollutants in its regulation HVMFS 2013:19 (Updated 2017-01-01).

The degree of purification of diclofenac in the Swedish treatment plants is low, i.e. most of the substance comes out in our nature. In Sweden diclofenac is found in surface water at levels reported to have effects on fish.

Diclofenac is included in Region Stockholm's list of pharmaceuticals with risk for negative environmental impact according to the environmental program 2017–2021 based on lowest effect concentration, LOEC = 1 microg/L, and concentrations found in the environment. Diclofenac has been detected in treated wastewater and surface water in Region Stockholm.

In India and Pakistan several species of vultures have been endangered because of the veterinary use of diclofenac when the dead cows for cultural reasons is left to the vultures. In recent years the same problem has been seen in eagles in same areas. Similar effects on vultures and eagles are also suspected in Africa and there is even some concern in Europe for example in parts of Spain, where carcasses are left in the open for wild animals to eat.

Diclofenac can be purchased without prescription in Sweden. Since 3 October 2018, all pharmacies inform customers about diclofenac's negative impact on the environment.

Buying diclofenac without prescription is questioned again (2018-10-04) for medical reasons and for environmental reasons.

Diclofenac has been associated with a greater risk of serious cardiovascular events than other COX inhibitors in several studies. The Swedish Medical Products Agency decided that tablets and capsules containing diclofenac should be reclassified as precription-only medicine from 1 June 2020 due to the risk of cardiovascular adverse events. Topical preparations without prescription are not affected by the decision.

Suggestions on how to reduce the emissions of diclofenac

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 diclofenac

  • Diclofenac is not recommended in the Wise list.
  • Note that diclofenac is also sold without prescription (gel, patches and spray). What are your recommendations for patients with regard to OTC pain relief pharmaceuticals?


  1. Fass.se för vårdpersonal
  2. Goodpoint. Prioritering av läkemedel med miljörisk inom SLL. Stockholm: Goodpoint; 2016. Rapport LS 2016–0634.
  3. Goodpoint. Jämförande bedömning av miljörisk vid användning av diklofenak, naproxen, ibuprofen, ketoprofen, etoricoxib, celecoxib samt paracetamol. Stockholm; Goodpoint; 2019.
  4. Havs- och vattenmyndigheten. Havs- och vattenmyndighetens föreskrifter om klassificering och miljökvalitetsnormer avseende ytvatten. HVMFS 2013:19.
  5. Näslund J, Asker N, Fick J, Larsson J, Norrgren L. Naproxen affects multiple organs in fish but is still an environmentally better alternative to diclofenac. Aquatic Toxicology, Volume 227, October 2020.
  6. IVL Swedish Environmental Research Institute Ltd. Fick J, Lindberg RH, Kaj L, Brorström-Lundén E. Results from the Swedish National Screening Programme 2010. Subreport 3. Pharmaceuticals.
  7. Triebskorn R, Casper H, Scheil V, Schwaiger J. Ultrastructural effects of pharmaceuticals (carbamazepine, clofibric acid, metoprolol, diclofenac) in rainbow trout (Oncorhynchus mykiss) and common carp (Cyprinus carpio). Anal Bioanal Chem. 2007;387:1405-16.
  8. Fick J, Lindberg RH, Parkkonen J, Arvidsson B, Tysklind M, Larsson DG. Therapeutic levels of levonorgestrel detected in blood plasma of fish: results from screening rainbow trout exposed to treated sewage effluents. Environ Sci Technol. 2010;44:2661-6.
  9. Näslund J, Fick J, Asker N, Ekman E, Larsson DGJ, Norrgren L. Diclofenac affects kidney histology in the three-spined stickleback (Gasterosteus aculeatus) at low μg/L concentrations. Aquat Toxicol. 2017;189:87-96.
  10. Helmfrid I, Eriksson Cajsa. Läkemedelsrester från sjukhus och avloppsreningsverk. Universitetssjukhuset, Landstinget i Östergötland. Rapport 2010:1
  11. Provtagningar av läkemedelsrester i vatten, sediment och fisk för Region Stockholm.
  12. Naturvårdsverket. Avloppsreningsverkens förmåga att ta hand om läkemedelsrester och andra farliga ämnen. Rapport 2008
  13. Sveriges Apoteksförening. Alla apotek börjar informera om diklofenaks miljöpåverkan. Pressmeddelande 2018-10-03.
  14. Helene Wallskär. Receptfrihet för diklofenak ifrågasätts. Läkemedelsvärlden 2018-10-04.
  15. Region Stockholm. Förteckning över miljöbelastande läkemedel med åtgärdsförslag framtagen inom ramen för Region Stockholms miljöprogram 2017–2021.
  16. Schmidt M, Sørensen HT, Pedersen L. Diclofenac use and cardiovascular risks: series of nationwide cohort studies. BMJ. 2018;362:k3426.

Author: Health and Medical Care Administration, Region Stockholm