dˈɑːɹɹaɪfnˌæsɪn wˈɜːks baɪ blˈɑːkɪŋ ðɪ ˈɛm θɹˈiː mˌʌskɐɹˈɪnɪk ˈæsɪtˌɪlkəlˌiːn ɹᵻsˈɛptɚ, wˌɪtʃ ɪz pɹaɪmˈɛɹᵻli ɹᵻspˈɑːnsᵻbəl fɔːɹ blˈædɚ mˈʌsəl kəntɹˈækʃənz.
Darifenacin works by blocking the M3 muscarinic acetylcholine receptor, which is primarily responsible for bladder muscle contractions.