A Allanhist PDX Syrup (Brompheniramine/Dm/Guaifenesin/Phenylephrine) by adhealth32 August 26, 2010 What is Allanhist PDX Syrup (Brompheniramine/Dm/Guaifenesin/Phenylephrine)? Brompheniramine is an antihistamine that reduces the natural chemical…
