An ingredient in Mucinex, Guaifenesin, is thought to be at the center of the theory. As the Mayo Clinic explains, ...

Guaifenesin is the active ingredient in oral cough medications such as Mucinex or Robitussin for Direct Chest Congestion.

An extensive review determined that the ingredient, oral phenylephrine, doesn’t actually relieve nasal congestion.

So, how far would you go to get pregnant or become more fertile? For some women, using Mucinex, the cough medicine, to address and clear up mucus or flem, as Guaifenesin is an active ingredient ...

If you have a bottle of Mucinex in your medicine cabinet, you may need to throw it away. Earlier this week, drugmaker RB recalled certain lots of over-the-counter Mucinex Fast-Max liquid products ...