Guaifenesin and Phenylephrine DESCRIPTION NewsLinks Entex LA is an orange, scored, long-acting tablet for oral administration and contains phenylephrine hydrochloride ... 30mg guaifenesin ....................................... 400 mg in a special base to provide a prolonged therapeutic effect. This product contains ingredients of the following therapeutic classes: decongestant and expectorant.

Discussion group for Guaifenesin patients.