I stopped due to side effects. I was taking 2000 mg of noscapine base each day. The dose was taken four times a day at 500 mg per day.
There are in fact side effects although not as severe as traditional methods of dealing with PC. Some of the side effects are a marked decrease in blood pressure. My BP is naturally low but while on noscapine my normal BP got down to the 58/90 range. Many times I felt light headed and was short of energy a lot. Another side effect was not being able to get to sleep easily. I spent many nights up into the wee hours. Another side effect is the depression of sexual desire. I never felt so sexless in my life. It was as if sex didn't exist.
If you try the product and decide to come off it, don't do what I did and go cold turkey. There are withdrawal symptoms. I was hard to be around and couldn't sleep at all. I felt my blood pressure would rise and fall rapidly. It was not pleasant, and if I do noscapine over again and decide to stop taking it, I will taper off over a period of weeks.
The cost is a factor in why I stopped taking the product. I found a US source that sells the product much less than the pharmacy in Israel but it is stil not cheap. I was paying $1.80 per capusule (500 MG). Four times a day, that adds up to $ 7.20 per day and $ 216.00 per month.
If my PC starts to become more aggressive, I will go back on noscapine. It works best when it interfers with the tublin formation in rapidly dividing cells and as far as I can tell that is not me at this time.
Another product that seems to work like noscapine at the cell level is Paw Paw. This product costs a lot less than noscapine but also has side effects. If you are interested in more info on this google it or send me a e-mail and I will let you know more.