Hi! I do, and I will annoy the heck out of any doctor who says not to. I just believe they don't know and are taking advice from someone else. On my first trip through inpatient rehab, I had severe congestion (with pneumonia) after a week in the hospital. My Doctor and respiratory therapist put me on Mucinex - 1200mg x2 daily extended release. It helped tremendously, and I have stayed on it ever since, with no issues, and orders from all my doctors. So, to all those articles and naysayers here, I say bull! It has been a huge help to me and still works very well after 3 straight years. My advice to you is to take it, and if your doctor doesn't like it, get a new doctor. I may considered by some here to be somewhat militant with doctors, but that's the way I see it. The stuff works very well for me and I highly recommend it. No disrespect to anyone, but I consider it indispensable in my daily meds. Deciding if it works for you should be your decision.