Question: I had aortic valve replacement, about 2 months ago. Shortly after discharge, I started to cough, with tons of mucus being expelled. I just put it off as a chronic post-nasal drip (allergic rhinitis), but it has not been alleviated with anti-histamines, cough medicine, or, nasal sprays. In fact it is far worse than my allergic reactions have ever been. When the cough starts, it is almost impossible to stop it, and, it is such a very deep and productive cough, that a need to go through boxes of tissues. It is also extremely exhausting, as it seems very deep, and, there is so much mucus to be coughed up. It has even prevented my from going out, as, I fear the cough is so unpredictable, that I couldn't be with other people.
My doctor, and I, have left no stone unturned. Many tests have been done, my lungs are clear, and, we can't find any cause, or solution to the problem. It is driving me mad, as, it so depletes my energy, that I don't have much left to do the exercises required after cardiac surgery.
My doctor stopped my taking one of the blood pressure medications (candesartan), but, there seems to be no effect. Also, we have also tried acid reflux pills, which have worked for some. Not for me!
Do you have any other suggestions?

I wonder if this is an after-effect of my surgery, and, maybe it will disappear on it's own. I really hope so!

Yes, I have undergone PFT, in fact I had it just before surgery.
I do not have bronchitis, or bronchiextis (spelling?),or, anything else that I have been tested for. I even had a recent repeat chest x-ray, and, all seems to be normal. Also, bronchial dilators, or, inhaled cortisteroids, have not proven effective.
It's so frustrating, as, the cough is so unpredictable, and if it occurs, I almost sound like I have whooping cough!
There has to be an answer somewhere, but, both my family doctor, and I are stymied. I see my cardiac surgeon next week, and, maybe she will have some answers.
Meanwhile, maybe you can come up with some helpful suggestions.
I thank you for your interest.

I have just read about the benefits0f N-A-C.
It sounds like it may be exactly what I need to try.

I'm concerned about potential side effects, or reactions, with current medication I am taking (Bisoprolol; Pradaxa, and methotrexate (for rheumatoid arthritis).

The articles I have just read, seem to suggest that it is safe enough, with no adverse reactions.
What is your opinion?
The suggestion seems to be to take 600 mg., either once or twice a day.
What do you suggest?

I'm very excited right now, because this might be the answer that I have been desperately looking for.
I can't thank you enough.

I weigh 148 pounds.

Hopefully, this will be my last question!
How long will it take to see the benefits of NAC?