Patients w/ sudden change in bowel habits persisting for 2 wk; abdominal pain, nausea, vomiting, rectal bleeding. May cause an allergic reaction in people sensitive to inhaled or ingested psyllium. Taking the product w/o enough fluid may cause it to swell & block the throat or oesophagus & may cause choking. Do not use in cases of medication-induced constipation. Do not use in patients w/ swallowing difficulty; intestinal obstruction or blockage. Patient may experience changes in bowel habit or minor bloating. Pregnancy & lactation. Not recommended for childn <12 yr.