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[Display omitted] • A novel electrochemical sensor for dopamine detection was successfully developed. • The IL terpolymer/iron oxide/MWCNT electrode displayed a great synergistic response. • Dopamine was detected in the presence of a 25-fold excess of ascorbic acid. • After 80 runs TS-MAG-MWCNT electrode showed only an 8% reduction in its sensitivity. • Sensor response is not affected by the matrix composition or other interferents. In this study, we introduce a novel electrochemical sensor for dopamine (DA) detection utilizing an ionic liquid-based terpolymer/iron oxide/multiwalled carbon nanotube (TS-MAG-MWCNT) nanocomposite electrode. The synergistic combination of improved surface adhesion, electrocatalytic activity, and electron conductivity of each individual material enables the determination of DA in the presence of a 25-fold excess of AA (ascorbic acid). The electrode, operated by square wave voltammetry, allows the detection of DA within a wide linear working range from 1 µmol/L to 200 µmol/L, with a limit of detection of 63 nmol/L. A single TS-MAG-MWCNT electrode can be used for more than 80 consecutive runs, with only an 8 % reduction in its sensitivity. Additionally, the response of electrodes fabricated in different batches varies by only 5 %. The sensor's response is not affected by the matrix composition or other interferents, as demonstrated by experiments conducted in synthetic urine. [ABSTRACT FROM AUTHOR]