Enema: What It Is, Types, How to Use One Safely and Risks
Updated: 6 days ago
Written and medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026 · How we review
Quick Answer
An enema is a procedure in which fluid, such as saline, glycerin or mineral oil, is placed into the rectum to help the bowel empty. It is mainly used for stubborn constipation, fecal impaction and bowel preparation before a colonoscopy or surgery. Most work within 15 minutes to an hour; overuse, wrong technique or too much fluid can cause harm. [1][2]
What the research says
Phosphate enemas can be toxic in high-risk groups. A systematic review of studies from 2005 to 2021 identified 25 relevant papers and seven adult deaths in case reports. Toxicity was mostly linked to too high a dose or holding the enema too long; young children with Hirschsprung disease and older adults with other illnesses or kidney impairment were most at risk. (Hamilton Smith et al., Clinical Toxicology, 2022) [3]
Enemas clean the lower bowel as well as oral prep for a short scope exam. A meta-analysis of 8 randomized trials with 2,457 patients found enema and oral bowel preparation equally effective before flexible sigmoidoscopy, with similar rates of side effects (OR 0.87) and poor preparation. (Sajid et al., Updates Surg, 2015) [4]
Homemade coffee enemas carry risk with no proven benefit. A systematic review found 9 case reports of harm, 7 of them colitis, and no study showing that coffee enemas work. The authors advise against self-administering them. (Son et al., Medicine (Baltimore), 2020) [5]
Key takeaways
An enema delivers fluid straight into the rectum to soften stool, lubricate the colon or trigger a bowel movement.
It is usually a last step for constipation, after water, fiber and oral stool softeners.
Most people poop within about 15 minutes; some enemas take up to an hour.
Follow the kit directions exactly. Too much fluid, very hot or cold fluid, or forcing the tip can injure the bowel.
People with chronic kidney disease should avoid sodium phosphate enemas.
Frequent use can worsen constipation and hide an underlying condition.
What is an enema?
An enema is an injection of fluid directly into the rectum that helps you have a bowel movement. You can receive one in a clinic, but most people use an over-the-counter kit at home. Kits are sold without a prescription in most pharmacies. [1]
The word "enema" can mean the procedure itself or the fluid used for it. People have used enemas for centuries to flush stool out of the colon (large intestine). [1]
How does an enema work?
An enema works by creating pressure inside the colon, which triggers the reflex that makes you poop. This does not mean any fluid is safe to use. [1]
Pharmacy enemas add extra effects to that reflex. Depending on the type, they:
Pull water into stool to soften it
Stimulate the colon muscles to move
Coat and lubricate the colon so stool slides out more easily [1]
Why would you need an enema?
An enema is used to relieve constipation, clear impacted stool, prepare the bowel for a procedure or deliver medicine. [1]
Reason | What the enema does |
Stubborn constipation | Brings relief when lifestyle changes and oral stool softeners have not worked |
Helps clear hard stool stuck in the colon — far less invasive than surgical removal | |
Before colon or rectal surgery | Empties the bowel to lower the risk of infection |
Before a colonoscopy | May be part of bowel preparation so the doctor gets a clear view |
Barium X-ray | A chalky barium liquid makes problem areas easier to see on an X-ray |
Medicine delivery | Places drugs, such as anti-inflammatory treatment for ulcerative colitis, directly in the colon |
Some people use enemas to "detox" or lose weight. There is no evidence that enemas help with either. [1]
What are the different types of enemas?
Enema types are grouped by the solution they contain, their purpose and the amount of fluid used. [1]
By solution
Solution | How it works | Notes |
Sodium phosphate (saline) | Pulls water from the colon into stool | Most common and fastest-acting; avoid with chronic kidney disease |
Glycerin | Draws water into the colon to soften stool | — |
Bisacodyl | Stimulates the colon to push stool out | — |
Mineral oil | Lubricates the colon | Usually held for a while (retention) |
Tap water | Softens stool | — |
Barium | Shows the colon on X-ray | Used only during a special imaging test |
Homemade mixes made with soap, vinegar, milk or coffee have not all been tested for safety. They can irritate or injure the colon, so a pharmacy product is the safer choice. [1][5]
By purpose and amount
Type | What it means |
Cleansing enema | Clears you out within minutes — most enemas are this type |
Retention enema | Held for the time on the label so it can work, such as mineral oil |
Small-volume enema | Less than 500 mL; cleans the lower colon |
Large-volume enema | 500 to 1,000 mL; reaches higher for a fuller cleanse |
Whatever the type, use exactly the amount your kit or provider directs. Too much fluid can damage the colon. [1]
How do you give yourself an enema safely?
You give an enema safely by following your kit's instructions closely, using room-temperature fluid, inserting the tip gently and never forcing it. Kits vary: the fluid may come in a bottle or a bag, and the tip may be a tube, nozzle or syringe. [1]
Set up. Lay a towel on the floor in case of leaks, and keep a timer nearby.
Prepare. Wash your hands and prepare the solution as directed. Make sure it is at room temperature; fluid that is too hot or cold will hurt.
Get into position. If alone, lie on your non-dominant side with the knee of your top leg pulled toward your chest, so your dominant hand is free. If someone is helping, kneel and lean forward with the side of your face resting on the towel.
Insert gently. Lubricate the tip (for example, with petroleum jelly or a water-based lubricant) and insert it only as far as the kit says. If it will not go in, stop and contact your provider.
Release and wait. Squeeze in the correct amount, then slowly remove the tip. For a retention enema, wait the time on the label before using the toilet. Otherwise, go as soon as you feel the urge. [1]
How long after an enema do you poop?
Most people poop within about 15 minutes of an enema, though some types take up to an hour to fully work. Check your kit for its expected time frame. [1]
Time after enema | What to expect |
A few minutes | Urge to poop with cleansing enemas |
Up to 15 minutes | Bowel movement for most people |
Up to 1 hour | Full effect for some types; stay near a toilet |
Past the label window | Nothing has happened — contact your provider |
A footstool can make waiting on the toilet more comfortable, especially for children whose feet do not reach the floor. A book or phone can help pass the time. [1]
What are the risks and side effects of an enema?
An enema is safe when done correctly, but mistakes can cause pain, bowel injury, infection or electrolyte problems. [1]
Risk | Why it happens |
Pain or discomfort | Fluid too hot or cold, or a forced tip; take extra care with hemorrhoids |
Rectal tear | Careless insertion; bright red blood in stool may signal a tear |
Colon tear | Too much fluid; higher risk after previous colon surgery |
Infection | Unclean equipment; people with weak immune systems may need to avoid enemas |
Long-term constipation | Overuse can weaken the colon's natural "muscle memory" |
Electrolyte imbalance | Sodium phosphate enemas in people with chronic kidney disease |
Missed diagnosis | Relying on enemas can hide the condition causing constipation |
Phosphate enemas deserve special caution. Never use more than one sodium phosphate enema in 24 hours, and do not give them to children under 2. Research links their toxicity to high doses and to holding the enema too long, with young children and older adults with other illnesses at greatest risk. [3]
Who should avoid an enema or ask a doctor first?
People with chronic kidney disease, a weakened immune system, previous colon surgery or hemorrhoids should check with a healthcare provider before using an enema. Sodium phosphate types in particular should be avoided with chronic kidney disease. [1]
Enemas are not right for everyone. If you are unsure whether one is safe for you — or for a child — ask a provider first. For children, see our guide to constipation in children. [1][3]
Are enemas better than laxatives for constipation?
Enemas are not a first-line treatment for constipation. More water and fiber usually help first, followed by oral options such as stool softeners and laxatives. An enema is typically used when those steps have failed. [1][2]
The main benefit of an enema is speed: it often brings relief within minutes. The trade-off is that frequent use can make constipation worse over time. [1]
When should you call a healthcare provider about an enema?
Call a healthcare provider before using an enema for constipation, because simpler solutions may help. [1]
Also contact your provider if:
Nothing happens within the time frame on your kit — some enemas can cause dehydration if they stay in the body too long
You see bright red blood in your stool
The tip will not go in without force
You are unsure how to do the procedure correctly
You find you need enemas often [1]
Conclusion
An enema can bring fast relief when constipation will not budge, and it plays a useful role in bowel preparation, imaging and medicine delivery. It is safest when used only as needed, with the right product, the right amount of fluid and the kit's instructions followed exactly. If you are reaching for enemas often, talk to a provider — the cause of your constipation may need its own treatment.
Want to understand what is behind your symptoms? Read our complete guide to constipation: symptoms, causes, diagnosis and treatment, and explore more clear, medically reviewed health guides on rinnit.com.
FAQ
What is an enema used for?
An enema is used to relieve stubborn constipation, clear fecal impaction and empty the bowel before a colonoscopy or colon surgery. It is also used for barium X-rays and to deliver some medicines directly into the colon.
How long does it take for an enema to work?
Most enemas work within about 15 minutes. Some types can take up to an hour, so stay close to a toilet for the first hour.
What should I do if an enema does not work?
Contact your healthcare provider if nothing happens within the time frame on your kit. Some enemas can cause dehydration if they stay in the body too long. Do not use a second enema without advice.
Is it safe to do an enema at home?
An over-the-counter enema is safe for most people when used exactly as directed. Use room-temperature fluid, insert the tip gently and never force it. Check with a provider first if you have kidney disease, a weak immune system or previous colon surgery.
Can you use an enema too often?
Yes. Frequent enemas can weaken the colon's natural ability to move stool and lead to long-term constipation. Regular use can also delay the diagnosis of an underlying condition.
Who should not use a sodium phosphate enema?
People with chronic kidney disease should avoid sodium phosphate enemas because they can upset electrolyte levels dangerously. Young children and older adults with other illnesses also face higher risk.
Do enemas detox the body or help with weight loss?
No. There is no evidence that enemas remove toxins or help with weight loss. Homemade coffee enemas have been linked to colitis and other harms.
What is the difference between a cleansing and a retention enema?
A cleansing enema clears the bowel within minutes after the fluid is inserted. A retention enema is held for a set time, such as a mineral oil enema that needs time to lubricate the colon.
What position should I use for an enema?
Most kits recommend lying on your left side with your knees bent toward your chest. This position helps the fluid flow into the rectum and colon. Always follow the directions on your kit.
Can I give an enema to a child?
Only use an enema made for children and only as your child's doctor or the label directs. Never give an adult enema to a child, and do not use a sodium phosphate enema in a child under 2 unless a doctor tells you to.
Related Reading
Digital Disimpaction: Procedure, Benefits and Risks explains digital disimpaction.
References
Cleveland Clinic. Enema: What It Is, How It Works, Procedure, Benefits. Cleveland Clinic. Last updated November 20, 2023. https://my.clevelandclinic.org/health/treatments/enema
Diaz S, Bittar K, Hashmi MF, et al. Constipation. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; last updated November 12, 2023. https://www.ncbi.nlm.nih.gov/books/NBK513291/
Hamilton Smith R, Eddleston M, Bateman DN. Toxicity of phosphate enemas — an updated review. Clin Toxicol (Phila). 2022;60(6):672-680. PMID 35510830. https://doi.org/10.1080/15563650.2022.2054424
Sajid MS, Caswell JF, Abbas MA, et al. Improving the view during flexible sigmoidoscopy: a systematic review of published randomized, controlled trials comparing the use of oral bowel preparation versus enema bowel preparation. Updates Surg. 2015;67(3):247-256. PMID 25894508. https://doi.org/10.1007/s13304-015-0295-2
Son H, Song HJ, Seo HJ, et al. The safety and effectiveness of self-administered coffee enema: a systematic review of case reports. Medicine (Baltimore). 2020;99(36):e21998. PMID 32899046. https://doi.org/10.1097/MD.0000000000021998
National Library of Medicine (U.S.). Label: Enema Mineral Oil (mineral oil enema). DailyMed. Last updated December 31, 2024. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=44ded8db-cace-416a-a15f-921fcdaa11bd
National Library of Medicine (U.S.). Label: Kaisalilu Glycerin Liquid Laxative Enema (glycerin liquid). DailyMed. Last updated December 26, 2019. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=eb35c241-29ef-4be7-9b07-039a059017dc
National Library of Medicine (U.S.). Label: Fleet (bisacodyl enema). DailyMed. Last updated June 23, 2025. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=324e61eb-8f6b-48d7-85c2-b1b5642691c9
Medical disclaimer
This article is for general educational purposes only and does not replace professional medical advice, diagnosis or treatment. Always follow the instructions on your product and talk to a qualified healthcare provider before using an enema, especially for a child or if you have a medical condition.
Comments