HI, I understand your concern. Dulaxis a purgative with common side effects like- Abdominal discomfort, cramps, nausea, loose motions, fluid/electrolyte depletion. leading to dizziness/fainting. IN your case the drug is not effective- so no question of side effects. You seem to have chronic constipation. To control it you need to change your life style apart from medicines. _ Get your stools examined to find any infection. take specific medicines if needful to combat it. - Take balanced diet with lot of salads, vegetables,fruits with Eat food in it s natural form.Avoid processed/refined food. - Drink 10-12 glasses of water in a day. - daily exercise with walking( 45 minutes), Yoga exercises -specially those for abdominal muscles. - To start with take mild purgatives like liquid paraffin2-4 spoons twice after food. Use of glycerine suppository every morning avoids hard motion. - Adapt(Try to form a habit) a regular toilet habit at a fixed time daily. - Use Digestive enzyme tonics after food. Thanks.