Guaifenex and heart palpitations

I took guaifenex on saturday morning and felt during the day that the drug was doing it's work, i was happy that my cold was getting better, well at midnight heart palpitations began so hard i thought i was having a heart attack. this lasted for almost a day. i was almost in a state of panic between the side effects and the lack of sleep. horrible! the worst experience of my life with a prescribed drug. i was drinking gatorate the whole day to flush the drug out of my body. felt i was going to die or collapse that same day, it was an unbearable torture. i'm being very careful now with drugs after this episode.

After about 5 days on this drug I started getting heart palpitations just doing normal activities. I also had some muscle soreness. I also had trouble sleeping fromit. I have been off the drug 24 hours now and the palpitations persist. Hopefully they will go away soon. Will not take this drug again.

Warning! Never take medication prescribed for someone else, and always check for serious side effects. Since having chest and sinus congestion for three months, I decided to take my son's left over guaifenex. After three days, I experienced heart palpitations unlike anything else before. I also had a weird cold sensation, extremely hard to warm up. After a night's sleep, my heart rate has not yet returned to normal. I am horrified to know that this potentially harmful medication was prescribed to my then 11 yr. old child.

I had a wonderful experience after taking this drug. I actually slept better, was more relaxed and for some reason, got all my office work done. All my files were in order and my whole office was organized. I have never been able to work as efficiently as when I was taking this medication. No amount of caffeine compares to this drug! I took one per day. I had no heart palpitations or headaches. I recently found out I may have adult ADD and my physician is very curious to know the ingredients in this drug, as they will be useful in prescribing an appropriate medication for the ADD.

I think my initial posting just got lost (!). I apologize if this ends up to be a repeat. I was taking Guaifenex 600 mg 2 times a day for about 4 weeks for sinus troubles and then began to notice heart palpitations any time I did anything active. After about 5 days of this, I finally realized it must be the medication and I stopped it. Now it has been a week exactly since my last pill. THe strong palpitations have stopped (that took about 5 days to end) but I still don't feel right - there is a heaviness in my chest and sometimes my heart seems to beat erratically, although I am having no more strong palpitations. My doctor and pharmacist both say that I should feel fine now but does anyone have any personal experience with side effects lasting a week or longer after discontinuing this drug?