Which preoperative medication has effects similar to atropine but causes less dry mouth?

Which preoperative medication has effects similar to atropine but causes less dry mouth?

• A. Atropine
• B. Glycopyrrolate (correct)
• C. Benzo
• D. H2 blocker

Answer: (B)

Both atropine and glycopyrrolate are antimuscarinic drugs used as antisialogogues during anesthesia to reduce secretions and help prevent reflex bradycardia. They produce similar peripheral effects, such as decreasing salivary and airway secretions and increasing heart rate. The key difference is their ability to affect the central nervous system. Atropine is lipophilic and crosses the blood–brain barrier, which can lead to more central and mucosal drying side effects, including drier mouth. Glycopyrrolate is a quaternary ammonium compound that does not cross into the CNS easily, so it delivers the same antisialogogue effect with markedly less dry mouth and fewer central effects. That combination—similar peripheral effects with less oral dryness and CNS impact—makes glycopyrrolate the preferred preoperative medication for reducing secretions without as much dryness of the mouth. The other options aren’t antimuscarinics used for this purpose, so they don’t fit.

Both atropine and glycopyrrolate are antimuscarinic drugs used as antisialogogues during anesthesia to reduce secretions and help prevent reflex bradycardia. They produce similar peripheral effects, such as decreasing salivary and airway secretions and increasing heart rate. The key difference is their ability to affect the central nervous system. Atropine is lipophilic and crosses the blood–brain barrier, which can lead to more central and mucosal drying side effects, including drier mouth. Glycopyrrolate is a quaternary ammonium compound that does not cross into the CNS easily, so it delivers the same antisialogogue effect with markedly less dry mouth and fewer central effects. That combination—similar peripheral effects with less oral dryness and CNS impact—makes glycopyrrolate the preferred preoperative medication for reducing secretions without as much dryness of the mouth. The other options aren’t antimuscarinics used for this purpose, so they don’t fit.