Dixiebrooks,
Many people have experienced constipation while on alli, the extent and duration varies.
alli works in the gut by blocking the absorption of about 25% of fat consumed in a meal which is then eliminated through the intestinal tract. Symptoms may occur when there are other underlying causes. As it states on the package :
Stop use and as a doctor if *severe or continuous abdominal pain occurs. This may be a sign of a serious medical condition.
Hope that everything checks out fine for you. You health and safety come first.
Sophia De Monte RPh