This was a question asked in our trying to conceive forum. It turns out that it can help, if your problems conceiving are affected by the cervical mucous.
So how does it work? Well, the active ingredient in Robitussin is guaifenesin. This drug works by thinning the mucous when you are sick and stuffed up or coughing, which relieves the symptoms.
In addition to thinning the mucous in your head, the drug also thins the cervical mucous. This can create a more hospitable environment for the sperm. If you are under a doctor’s care for infertility, your cervical mucous quality may have been evaluated with a post coital test. If so, ask the doctor about the results and if Robitussin may help.
When ovulation is approaching, the cervical mucous becomes thinner and stretchy. This is the optimum environment for the sperm to move easily, which increases the likelihood it will reach the egg. Robitussin helps by increasing this natural thinning.
You can use either brand name Robitussin or a generic. If you are using Robitussin, use the original formula only. Some of the others have active ingredients in addition to the guaifenesin. These may actually counter the affect of the active ingredient, negating the effect.
When you are choosing a store brand version, it will say “compare to the active ingredient in Robitussin”. Check the ingredients to be sure guaifenesin is the only active ingredient listed. There is nothing magic about the Robitussin name, just look for that active ingredient.
I do have friends who have had success using Robitussin, all on the advice of their physicians. They took the medicine three times each day. Take the full dose allowed on the bottle if you have thick mucous. Also, it is important to stay hydrated to help thin the mucous as well. Drink water with every dose and sip in between doses to ensure you are well hydrated.
If you are under care of a doctor for the treatment of a specific infertility issue or treatment, check with her before taking any medication. This isn’t because Robitussin isn’t safe, but you want to be sure it won’t interfere with any other treatment or medication you are taking.
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Infertility Testing: The Post Coital Test