“…No serious adverse cardiac event attributed directly to tolterodine use has been documented in any of more than a few dozen well-conducted clinical trials. Overall, central nervous system (CNS) side effects from tolterodine are rare [19,33]. Unlike immediaterelease oxybutynin and its major metabolite (N-desethyloxybutynin), which cross the blood-brain barrier and theoretically may cause CNS adverse effects such as somnolence and cognitive impairment [34•], tolterodine has lower lipophilicity and therefore, probably less penetration into the CNS [35,36].…”