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Filmdragerad tablett 5 mg/850 mg
(Bruna, bikonvexa, 9,5 x 20 mm ovala, filmdragerade tabletter med ”5/850” präglat på ena sidan och ”1067” präglat på andra sidan)

Diabetesmedel, Perorala blodglukossänkande medel, kombinationer

Aktiva substanser (i bokstavsordning):
ATC-kod: A10BD15
Läkemedel från AstraZeneca omfattas av Läkemedelsförsäkringen.
  • Vad är miljöinformation?




Miljörisk: Användning av metformin har bedömts medföra låg risk för miljöpåverkan.
Nedbrytning: Metformin bryts ned långsamt i miljön.
Bioackumulering: Metformin har låg potential att bioackumuleras.

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Detaljerad miljöinformation

PEC/PNEC = 23.4 µg/L / 100 µg/L = 0.23


Environmental Risk Classification

Predicted Environmental Concentration (PEC)

The PEC is based on the following data:

PEC (µg/L) = (A*109*(100-R))/(365*P*V*D*100)

PEC (µg/L) = 1.5*10-6*A*(100-R)

A (kg/year) =total sold amount API in Sweden year 2017, data from IQVIA (former IMS Health and Quintiles).

R (%) = removal rate (due to loss by adsorption to sludge particles, by volatilization,

hydrolysis or biodegradation) = 0 if no data is available.

P = number of inhabitants in Sweden = 9 *106

V (L/day) = volume of wastewater per capita and day = 200 (ECHA default) (Ref. 1)

D = factor for dilution of waste water by surface water flow = 10 (ECHA default) (Ref. 1)

(Note: The factor 109 converts the quantity used from kg to μg).

A = 155977.33 kg

R = 0 

PEC = 1.5 x 10-6 x 155977.33 x (100-0) = 23.4 µg/L


Metformin hydrochloride is excreted unchanged in the urine. No metabolites have been identified in humans (Ref. 2).

Ecotoxicity data



Common Name





ErC50 – Based on Growth Rate

Pseudokirchneriella subcapitata

Green Alga

OECD 201

72 h

>100 mg/L


NOEC – Based on

Growth Rate

100 mg/L

NOEC – Based on

Growth Rate

Note 1


Green Alga

99.5 mg/L


EC50 – Based on Immobilisation

Daphnia magna

Giant Water Flea

FDA 4.08

48 h

130 mg/L


NOEC - Based on Immobilisation

78 mg/L

NOEC – Based on Survival, Reproduction and Growth Rate

OECD 211

21 d

67 mg/L


NOEC – Based on Survival, Reproduction and Growth Rate

Note 2

54.1 mg/L


NOEC – Based on Reproduction

Ceriodaphnia dubia

Water Flea

ISO 20665

7 d

1 mg/L


Lepomis macrochirus

Bluegill sunfish

US FDA Technical Assistance Document 4.11

96 h

>982 mg/L


NOEC – Based on lack of mortality and abnormal effects

982 mg/L

NOEC – Based on hatch, survival, standard length and dry weight

Pimephales promelas

Fathead Minnow 

OECD 210

32 d

10 mg/L


NOEC – Based on hatch, survival, standard length and dry weight

Note 3

2.2 mg/L


NOEC – based on hatch, survival, standard length and dry weight

Note 1

Danio rerio

Zebra fish

11.1 mg/L

NOEC - Based on emergence and development rate

Chironomus riparius


OECD 218

28 d

100 mg/kg (dry weight)


NOEC - Based on emergence and development rate

>100 mg/kg

(dry weight)

Microbial Inhibitory Concentartion (MIC)

Anabaena flos-aquae

Nitrogen fixing bluegreen algae

FDA 4.02


100 mg/L


NOEC – Based on growth inhibition

80 mg/L

Microbial Inhibitory Concentartion (MIC)

Azobacter chroococcum

Nitrogen fixing Bacterium

800 mg/L

NOEC – Based on growth inhibition

400 mg/L

NOEC – Based on growth inhibition

Aspergillus clavatus


1000 mg/L

Penicillium canescens

Chaetomium globosum

Pseudomonas fluorescens


Bacillus megaterium

Note 1 - Geometric average (GA) of 2 data points

Note 2 - Geometric average (GA) of 4 data points

Note 3 - Geometric average (GA) of 3 data points

PNEC (Predicted No Effect Concentration)

Long-term tests have been undertaken for species from three tropic levels, based on internationally accepted guidelines. Therefore, the PNEC is based on results from the assessment of water flea (Ceriodaphnia dubia) study, NOEC = 1 mg/L, and an assessment factor of 10 is applied, in accordance with ECHA guidance (Ref. 11).

PNEC = 1000 µg/L/10 = 100 µg/L

Environmental risk classification (PEC/PNEC ratio)

PEC/PNEC = 23.4 / 100 µg/L = 0.23 µg/L, i.e. PEC/PNEC ≤ 1 which justifies the phrase “Use of metformin hydrochloride has been considered to result in low environmental risk.”.

In Swedish: ”Användning av metforminhydroklorid har bedömts medföra låg risk för miljöpåverkan.”.

Environmental Fate Data



Test Substance Concentration




Percentage Aerobic Biodegradation

FDA 3.11

10 mg/L

28 d


Not readily biodegradeable


Dissipation Half-life

OECD 308

1.0 mg/L (High Organic Matter Sediment)

102 d

DT50 = 6.59 days

(Total System)


1.0 mg/L (Low Organic Matter Sediment)

DT50 = 55.0 days

(Total System)

Hydrolysis Half-life

FDA 3.09


5 d

pH 5 = 0%

pH 7 & pH 9 = 1%

T1/2 = 25°C ≥ 1 year


Photolysis % deagradation and half -life

FDA 3.10


5 d

84.9 % (parent)

T1/2 28.3 days (Estimated)



Results from the aerobic biodegradation test (Ref. 12), showed that metformin hydrochloride is not readily biodegradable.

Evidence from the OECD 308 study (Ref. 13) is that metfromin hydrochloride is likley to dissipate from the aqueous phase and partition into the sediment phase.

High organic matter (HOM) sediment system:

The average mass balance ranged from 93.3 – to 100.2% of applied radioactivity (AR) throughout the 102-day study. The AR declined rapidly in the water phase, by Day 14 26.3% and by Day 27 only 4.5% remained, with < 1% of the initial concentration remaining in the water phase by Day 102. At the end of the test, Day 102, 13.1% of the AR was associated with the sediment. Despite the investigation of a number of different extraction solvents (acetoniltrile: purified reagent water: concentrated hydrochloric acid), 12.8% remained non-extractable.

Metformin hydrochloride was extensively biodegraded, the cumulative amount of 14CO2 evolved was 64% of AR by Day 27. The total system half-life was 6.59 days.

In the water and the sediment combined, two degradation products were present at >10% AR at Day 14. However, these were transient degradation products and neither was detected from Day 56 onwards. These were not considered further.

Low organic matter (LOM) sediment system:

The average mass balance ranged from 93.3 – to 103.9% of AR. Dissipation of the radioactivity from the water to the sediment was slower than that observed in the HOM test vessels, with 28.8% remaining in the water phase at Day 14, and 11.2% remaining at Day 102. Very little mineralisation was observed (3.2% at Day 102). The radioactivity in the test vessel remained associated with the sediment. At Day 14, 73.6% remained associated with the sediment, of which 30.7% of the AR was extractable. At Day 102, 81.5% of the AR was associated with the sediment in the low organic matter (LOM) vessels, however the extractable fraction had decreased to 14.0% of the AR.

Extractability of metformin hydrochloride was good. The proporotion of radioactivity associated with the non-extractable residues (NER) increased throughout the study, 68% AR at Day 102. The NER are considered non-bioavailable and therefore removed in the calculation of the LOM DT50 value. The total system half-life was 55 days.

Differences in the two systems can be explained by the fact that the degradation of metformin hydrochloride is believed to depend on the specific microorganisms in the HOM matrix at the time of dosing the can use metformin hydrochloride as a carbon source and subsequently biodegrade metformin hydrochloride, whereas the microorganisms in the LOM matrix do so to a lower extent. Additionally, the HOM sediment system had a higher microbial biomass which may also contribute to a higher amount of biodegradation in the HOM systems versus the LOM system.

Based on the data above, metformin hydrochloride is not predicted to be readily biodegraded during wastewater treatment. However, there is evidence that metformin hydrochloride will degrade within the aquatic environment, both in biotic and abiotic transformation (FDA 3.10 and OECD 308).

Based on the above, the phrase “Metformin hydrochloride is slowly degraded in the environment.” has been assigned.

In Swedish: “Metforminhydroklorid bryts ner långsamt i miljön.” under the heading “Nedbrytning”.


Metformin hydrochloride has has no significant bioaccumulation potential, as indicated by the low Log Kow (Log Kow = -1.43). Therefore the statement “Metformin hydrochloride has low potential for bioaccumulation” has been assigned.

In Swedish: ”Metforminhydroklorid har låg potential att bioackumuleras.” under the heading ”Bioackumulering”.

Physical Chemistry Data



Test Substance Conditions



Solubility Water 



300.5 mg/L


Partition Coefficient




Log Kow = -1.43


FDA 3.08

Wareham activated sludge

Kd = 10.3

Koc = 32.1



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  2. Summary of Product Characteristics for Komboglyze Film-Coated Tablets. Accessed 21st April 2016, and available at Link to document EMA

  3. Hoberg, J., Metformin Hydrochloride - Acute Toxicity to the Freshwater Green Alga,Pseudokirchneriella subcapitata OECD 201, Springborn Smithers Laboratories, Inc.:Report No. 12534.6219, 2007.

  4. Environmental Risk Assessment for metformin and its transformation product guanylurea in surface water. Caldwell.D, et al. SETAC Europe 24th Annual Meeting, Basle, Switzerland, May 11th–15th, 2014.

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  6. Putt, A., Metformin Hydrochloride - Full Life-Cycle Toxicity Test with Water Fleas Daphnia magna, Under Static-Renewal Conditions OECD 211, Springborn Smithers Laboratories, Inc.: Report No. 12534.6220, 2007.

  7. Sword M. Static Acute Toxicity of Metformin HCl to Bluegill (Lepomis macrochirus) ABC Laboratories, Inc. Report number 41779, July 1994.

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  9. Bradley, M., Metformin Hydrochloride – Toxicity Test with Sediment-Dwelling Midges (Chironomous riparius) Under Static Conditions, Following OECD Guideline 218. Smithers Viscient: Report No. 12534.6396, 2011.

  10. Wood, J.; Microbial Growth Inhibition with Metformin HCl, ABC Laboratories, Inc. Report No. 41776, Jul 13, 1994.

  11. [ECHA] European Chemicals Agency. Guidance on Information Requirements and Chemical Safety Assessment. Chapter R.10: Characterisation of dose [concentration]-response for environment. May 2008.

  12. Bielefeld, T.A.; Aerobic Biodegradation of 14C-Metformin HCl in Water, ABC Laboratories, Inc. Report No. 41775, Aug 10, 1994.

  13. McKnight, C. [14C]Metformin Hydrochloride [14C](BMS 201750) – Aerobic

    Transformation in Aquatic Sediments Following OECD Guideline 308. Smithers

    Viscient: Report No. 12534.6398, 2011.

  14. Hallberg, C.; Hydrolysis of Metformin HCl as a function of pH, ABC Laboratories, Inc. Report No. 41774, Aug 10, 1994.

  15. Putman, K.; Determination of the Aqueous Photodegradation of 14C-Metformin HCl, ABC Laboratories, Inc. Report No. 41950, Aug 11, 1994.

  16. AstraZeneca Environmental Risk Assessment of Saxagliptin/Metformin Fixed Dose Combination [CV.000-594-251], June 2010.

  17. Sorption / Desorption Springborn Smithers Laboratories FDA-3.08 12534.6221. July 2007.