The basic approach and understanding of managing constipation is wrong in your case as is with most people. Constipation is habit of intestines and not a disease. About 21 -22 ( approx) long colon doesn t expel waste material without peristaltic movements. To achieve these movements human body should have action like walk/ jog/ Yoga etc and lots of water to give freedom to intestines to do movements. Fiber intake further helps to expel unabsorbed and waste material. Most of the time something or more of above is missing. Further phenolphthaline type of drugs empty the guts indiscriminately. Then gut s length takes some time to fill up to reach the position to expel waste material further. Remaining in intestines for longer periods dries up excretable material further aggravating constipation - at rectum level or at anal canal level giving bruises like conditions upon forced expulsion. Hope you understand and follow the action and food intake as hinted above. Some safe herbal mild digestives and laxatives have upper hand if at all medicine is required. Hope it helps you.