Take it from the end of your period through ovulation. Be sure it is the regular Mucinex that only has guaifenesin in it. The other ingredients (antihistamines, etc) may have the opposite effect of drying out CM.
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Re: When do I start taking Mucinex?
I agree with PP- I havent tried it but I would start at the end of AF and take it until you have confirmed O.
Good luck to you!