Which category of medications is used to reduce bladder spasm thus relaxing the bladder to improve storage?

Which category of medications is used to reduce bladder spasm thus relaxing the bladder to improve storage?

• A. Alpha adrenergic antagonists (e.g. Tamsulosin)
• B. Calcium channel blockers (e.g., Nifedipine)
• C. Anticholinergics (e.g., Oxybutynin)
• D. Alpha adrenergic agonists (e.g., pseudoephedrine)

Answer: (C)

Anticholinergic medications reduce bladder spasm by blocking muscarinic receptors on the detrusor muscle. When acetylcholine would normally bind these receptors, it promotes bladder contractions; blocking them decreases involuntary detrusor contractions, allowing the bladder to hold more urine and thus improving storage. Oxybutynin is a classic example of this approach. Other categories don’t target detrusor overactivity in the same way: alpha-adrenergic antagonists mainly help with urine flow by relaxing tissue around the bladder neck and prostate, not by calming detrusor contractions; calcium channel blockers can reduce smooth muscle tone in some tissues but are not the standard treatment for detrusor overactivity; alpha-adrenergic agonists increase tone and would worsen storage symptoms.

Anticholinergic medications reduce bladder spasm by blocking muscarinic receptors on the detrusor muscle. When acetylcholine would normally bind these receptors, it promotes bladder contractions; blocking them decreases involuntary detrusor contractions, allowing the bladder to hold more urine and thus improving storage. Oxybutynin is a classic example of this approach. Other categories don’t target detrusor overactivity in the same way: alpha-adrenergic antagonists mainly help with urine flow by relaxing tissue around the bladder neck and prostate, not by calming detrusor contractions; calcium channel blockers can reduce smooth muscle tone in some tissues but are not the standard treatment for detrusor overactivity; alpha-adrenergic agonists increase tone and would worsen storage symptoms.