Sinus Medication Entex PSE and Female Hair Loss?

(female)
I have been taking Guaifenesin and Pseudoephedrine (EntexPSE,Pseudovent400 etc.) daily for more than three years. I have noticed a drastic change in my hair’s texture and fullness. My hair has always been extremely thick and healthy. Recently, it has been thinning and now has the texture of brillo. I am definitely losing large amounts of hair, additionally, each hair seems thinner and more fragile and “wiry” but no bald spots. Could either of the components of my sinus medication be causing these disturbing symptoms?

I’ve read reports that guaifenesin can be associated with hair loss in some patients, though it is not listed in the official list of side effects. I am afraid I can not render you an opinion on your observations, but I suggest you see a dermatologist (or more importantly, your prescribing physician) for a proper evaluation.