Tablet formulas typically advertise predictable overnight relief in about 8–12 hours. Infant liquid remedies, based on reviewer reports, often produce bowel movements much faster — from within minutes up to a few hours.
Common label warnings include consulting a doctor if you are pregnant or nursing, avoiding use if you have loose stools/diarrhea or unexplained abdominal pain, and keeping the product out of reach of children.
Most products list senna leaf extract and prune-derived ingredients (prune juice or concentrated prune extract). Some liquid formulations also include ingredients like fennel, dandelion extract, and prebiotics.