I have faced constipation problem for many years, i have already teaked differnt types of medicine for this constipation, but it never solbe my problem permarently, medicine can relif me only two to three days, when i passed my stool it is too hard blakish type, regularly i drink 2-3 ltr water and others fiver food, i passed out my stool every 2-3 days even 4 days after, somtimes its take too long, then i ised dulcolus tablet, please help me