J Korean Continence Soc.  2009 Dec;13(2):152-158.

The Effect of tolterodine Via Oral and Intravenous Administrations on Voiding in Awake Spontaneously Hypertensive Rats as an Overactive Bladder Model

• Lee SY
• Jin LH
• Kwon YH
• Jang JH
• Kang YJ
• Yoon SM
• Lee T

Abstract

PURPOSE
We investigated the effect of oral or intravenous tolterodine on cystometric parameters in awake spontaneously hypertensive rats (SHRs) as a model of overactive bladder (OAB). The aim of our study was to observe the experimental conditions required to reproduce the clinical pharmacological effects of tolterodine, as seen in humans, to decrease bladder pressure or increase bladder capacity.
MATERIALS AND METHODS
We studied the effects of the most widely used antimuscarinic drug, tolterodine, on cystometric parameters via two different administrations (oral and intravenous) in awake SHRs.
RESULTS
Oral administration of tolterodine 10 mg/kg(-1) body weight in awake rats did not change any cystometric parameters significantly. Intravenous administration of tolterodine 0.3 mg/kg(-1) body weight significantly decreased basal pressure (BP) and micturition pressure (MP), but showed no effect on micturition interval (MI) or bladder capacity (BC).
CONCLUSION
Despite a high dose of tolterodine via an oral or an intravenous route, a decrease in BP or MP was the only effect on cystometrographic parameters in awake rats, whereas MI and BC were not significantly affected. Therefore, it is difficult to reproduce in awake rats as an acute response the cystometric increase in the MI that is observed in humans after chronic administration of antimuscarinic agents.

Keyword

Tolterodine; cystometry; Spontaneous hypertensive rat

MeSH Terms

Administration, Intravenous*
Administration, Oral
Animals
Body Weight
Humans
Muscarinic Antagonists
Rats
Rats, Inbred SHR*
Urinary Bladder
Urinary Bladder, Overactive*
Urination
Tolterodine Tartrate
Muscarinic Antagonists