A Fleet saline enema typically produces a bowel movement within 1 to 5 minutes, though it can take up to 15 minutes for some people. The enema works by drawing water into your lower intestine, which softens stool and creates pressure that triggers your colon muscles to push everything out.
What to Expect After Using a Fleet Enema
After inserting the enema, you’ll lie on your left side and hold the liquid for 1 to 5 minutes until you feel a strong urge to have a bowel movement. Most people feel that urge quickly. Once you’re on the toilet, the full process of emptying your bowel can take longer, sometimes up to an hour to clear out completely, but the initial movement comes fast.
If nothing happens within 5 minutes of using the enema, don’t use a second one. Contact a healthcare provider for guidance. If no liquid or stool comes out within 30 minutes, seek immediate medical attention, as this could signal a blockage.
How the Saline Solution Works
Fleet’s standard enema contains sodium phosphate, which pulls water from your body into your intestine through osmosis. This does two things at once: it softens hard stool so it moves more easily, and it increases the volume of fluid in your colon. That added volume stretches the intestinal wall, which triggers the muscles to contract and push stool toward your rectum. It’s essentially a fast, localized response rather than something that works through your whole digestive tract.
Fleet Mineral Oil Enema Works Differently
Fleet also makes a mineral oil enema, which takes a slightly different approach. Instead of drawing in water, it coats the inside of your colon so stool can slide through with less friction. The onset window is 2 to 15 minutes, so it can be a bit slower than the saline version. If you’re dealing with particularly hard, dry stool, the lubrication approach may feel more comfortable.
Positioning Matters
For the enema to reach the right area, lie on your left side before inserting the tip about four inches into your rectum. Your left side is the ideal position because of how the lower colon curves. Gravity helps the liquid flow where it needs to go. Squeeze the bottle steadily until it’s empty, then stay in that position until the urge to go becomes strong. Rushing to the toilet too early can cause the liquid to come out before it has time to work on the stool.
Using Fleet Enemas in Children
Children use a pediatric version with a smaller volume. After giving the enema, keep your child in the lying position for 5 to 10 minutes, then have them sit on the toilet for up to 45 minutes to allow the bowel to empty fully. If no bowel movement happens within an hour, the remaining fluid may need to be drained. Your child’s doctor will specify the right amount of fluid based on their age and size.
Safety Limits and Risks
Do not use more than one Fleet enema in a 24-hour period. The sodium phosphate in saline enemas gets partially absorbed into your bloodstream, and repeated doses can throw off your body’s balance of essential minerals like potassium, calcium, and magnesium. In rare cases, sodium phosphate products have caused kidney damage, sometimes permanent, particularly in people who are dehydrated, older, or already have reduced kidney function.
Electrolyte imbalances from overuse can also lead to serious complications including irregular heartbeats and seizures. These events are uncommon with a single rectal dose used as directed, but the risk climbs with repeated use or in people taking certain blood pressure medications or anti-inflammatory drugs. If you have kidney disease, heart problems, or diabetes, a sodium phosphate enema may not be the safest option for you.
Fleet enemas are designed for occasional, short-term relief of constipation or for bowel preparation before medical procedures. If you find yourself reaching for one regularly, that’s a sign the underlying cause of your constipation needs attention rather than repeated quick fixes.