whats the difference between the white hydrocodon and the blue hydrocodon, relativly the same size, has the V on both, but ones blue and ones white. just curious.
I need to identify a yellow oval pill with an italic V on one side and the numbers 31 90 on the other.
Yellow oval imprinted V 3190 is Guaifen PSE Extended Release tablet. It's generic for Entex PSE and contains 600 mg guaifenesin and 120 mg pseudoephedrine. It's a combination decongestant and cough expectorant.