Objective-To investigate the sedative effects of guaifenesin in pigs by use
of electroencephalography.
Animals-10 Norwegian Landrace pigs (5 castrated males and 5 sexually intact
females).
Procedure-Guaifenesin (150 mg/kg of body weight, IV) was administered durin
g a 5-minute period. Using a 2-channel referential electrode configuration,
electroencephalograms were recorded before, during, and after infusion of
guaifenesin. Changes in spectral edge frequency 95% (SEF), median frequency
(MED), and total power were evaluated.
Results-After administration of guaifenesin, SEF decreased significantly an
d total power increased significantly; however, MED did not change signific
antly. Analysis of the data did not reveal differences between pigs on the
basis of sex.
Conclusions and Clinical Relevance-We concluded that guaifenesin synchroniz
ed the patterns of electroencephalograms. This is a strong indication that
the drug has a sedative effect in pigs. (Am J Vet Res 2000;61:1599-1601).