Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
ongoing or worsening constipation;
severe stomach pain;
blood in your urine;
black, bloody, or tarry stools; or
easy bruising, unusual bleeding.
Side effects such as constipation may be more likely in older adults.
Common side effects may include:
mild constipation, diarrhea;
stomach pain, nausea, loss of appetite;
bloating or gas;
irritation of your tongue; or
itching or irritation around your rectal area.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Questran side effects (more detail)
