NCIt definition : The fumarate salt form of fesoterodine, a competitive muscarinic receptor antagonist
with muscle relaxant and urinary antispasmodic properties. Fesoterodine is rapidly
hydrolyzed in vivo into its active metabolite 5-hydroxy methyl tolterodine, which
binds and inhibits muscarinic receptors on the bladder detrusor muscle, thereby preventing
bladder contractions or spasms caused by acetylcholine. This results in the relaxation
of bladder smooth muscle and greater bladder capacity, in addition to a reduction
in involuntary muscle contractions and involuntary loss of urine. The active metabolite
does not interact with alpha-adrenergic, serotonergic, histaminergic and excitatory
amino acid receptors and is eliminated via renal excretion.;