Pill Identification help....yellow *V *31 90

[ib2tight]

I found a few perscription looking pills in my little brothers room.
The pills were yellow with a cursive V on one side with the numbers 31 90 on the other side.
I asked if these were pain killers and he said no.....would apreciate any help

[robo]

These pills are Pseudoephedrine 120 mg and Guaifenesin 600 mg SR
Imprint Code V / 31 90
Description oblong yellow scored tablet
Info at
http://http://guaifenesin%20and%20ps...ine.drugs.com/