Mechanisms that underlie μ-opioid receptor agonist-induced constipation; differential involvement of μ-opioid receptor sites and responsible regions.
Mori T, Shibasaki Y, Matsumoto K, Shibasaki M, Hasegawa M, Masukawa D, Yoshizawa K, Horie S, Suzuki T.
J. Pharmacol. Exp. Ther., 347(1):91-99 (2013)