The preferred position for giving an enema is lying on your left side with your right knee drawn up toward your chest. This is called the left lateral, or Sims, position, and it’s used in hospitals, clinics, and home settings because it aligns the enema fluid with the natural curve of your lower colon for the most effective delivery.
Why the Left Side Works Best
Your large intestine follows a specific path through your abdomen. The last section, called the descending colon, runs down the left side of your body before connecting to the rectum. When you lie on your left side, gravity helps the enema fluid flow upward from the rectum into the descending colon rather than pooling near the entrance or fighting against your anatomy.
Bending your right knee toward your chest while in this position does two things. It relaxes the muscles around the rectum, making insertion of the enema tip easier and more comfortable. It also slightly opens the angle of the anal canal, which reduces resistance and lowers the risk of injury to the rectal wall. Cincinnati Children’s Hospital, for example, instructs caregivers to have a child lie on their left side with the right leg flexed toward the chest, and this same positioning applies to adults.
How to Set Up the Position
Lay a towel on the surface where you’ll be lying, whether that’s a bed, the bathroom floor, or inside a bathtub. Lie on your left side with your left arm resting behind you or tucked comfortably. Pull your right knee up toward your chest at a comfortable angle. Your left leg can stay mostly straight or bend slightly for stability.
If you’re giving yourself an enema at home, being near the toilet matters more than having a perfect setup. Many people position themselves on the bathroom floor with a folded towel for padding. The key is staying relaxed. Tension in your abdominal and pelvic muscles makes the process harder and less effective. Breathing slowly and deeply can help.
Alternative Positions
The knee-to-chest position is sometimes used as an alternative. You lie on your stomach and pull both knees underneath you so your chest is close to the surface. This can help the fluid travel deeper into the colon and is occasionally recommended for retention enemas, where the fluid needs to stay inside for a set period of time. However, this position is harder to hold comfortably and isn’t practical for most people doing this at home.
Some enema kits, particularly the pre-filled squeeze-bottle types sold at pharmacies, suggest lying on your left side or hugging your knees to your chest while on your side. Both approaches use gravity and anatomy to the same advantage. If the left-side position isn’t possible due to a physical limitation like a hip injury, lying on your back with knees bent and feet flat can work, though it’s less effective at distributing the fluid throughout the colon.
Staying in Position Afterward
For a standard cleansing enema, you’ll typically feel the urge to use the toilet within a few minutes of the fluid entering your colon. Try to hold the fluid for at least a couple of minutes if you can, as this gives it time to soften stool and stimulate the bowel.
Retention enemas, such as those containing mineral oil, work differently. These require you to hold the fluid inside your colon for a longer period so it has time to lubricate the stool. The specific hold time varies by product, so follow the instructions that come with the kit. Staying on your left side during the retention period helps prevent the fluid from moving toward the rectum too quickly, which makes it easier to hold.
Insertion Safety
Regardless of position, the enema tip should be inserted gently and never forced. If you feel resistance, stop, withdraw the tip, and try again slowly. Resistance can mean the tip is pressing against a fold of tissue or hard stool. Forcing it increases the risk of perforating the rectal wall, which is a rare but serious complication. A study published in the journal PMC noted that the position of the patient during administration is one of the factors linked to perforation risk, reinforcing why proper alignment matters.
Lubricating the tip with a water-based lubricant before insertion makes the process smoother and more comfortable. Most pre-packaged enema kits come with a pre-lubricated nozzle, but adding a small amount of extra lubricant is fine.
When Position Matters Most
Positioning becomes especially important for older adults and anyone with weakened rectal tissue. Conditions that thin or weaken the walls of the rectum or colon, such as prior radiation therapy or chronic inflammation, raise the stakes for proper technique. Ensuring the person is correctly positioned on their left side, relaxed, and not straining reduces mechanical stress on vulnerable tissue.
For children, the same left-side position applies, but a caregiver should keep one hand gently on the child’s hip to prevent sudden rolling or movement during the procedure. Keeping the child calm and still is just as important as getting the position right.