Klysmol

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Klysmol

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Klysmol

What is Klysmol?

Klysmol is a medicinal solution designed for rectal use, primarily functioning as an osmotic laxative. It is typically utilized for the short-term relief of occasional constipation or for bowel cleansing prior to medical examinations, such as radiologic or endoscopic procedures.

Composition and Mechanism

The active components of Klysmol are sodium phosphates. These substances work by increasing the concentration of salts within the intestinal lumen. Through the process of osmosis, this high salt concentration draws water from the surrounding body tissues into the bowel.

This influx of water results in:

  • Softening of the stool: Making it easier to pass.
  • Increased volume: Expanding the contents of the rectum.
  • Stimulation of peristalsis: Triggering the natural muscle contractions of the intestines to facilitate a bowel movement.

Physical Characteristics

Klysmol is provided as a clear, colorless liquid solution. It is contained within a flexible plastic bottle equipped with a pre-lubricated rectal nozzle, designed to ensure the solution is delivered directly into the lower part of the large intestine. Unlike oral laxatives that must pass through the entire digestive system, Klysmol acts locally in the rectum and sigmoid colon, which generally results in a prompt evacuation, usually within a few minutes of application.

Regulatory References

  1. U.S. National Library of Medicine
  2. MedlinePlus

What side effects are possible with Klysmol?

Possible side effects and safety information

The official regulatory safety documentation for Monosodium Phosphate Rectal Solution (Klysmol) classifies potential effects into expected local reactions and serious systemic risks. The safety profile is defined by two key domains: Gastrointestinal Effects and the potential for Metabolic and Electrolyte Disturbances, especially when the preparation is used improperly or in vulnerable individuals.


Adverse Reaction Categories and System Involvement

Adverse reactions that are commonly documented relate to the digestive system and general discomfort. These include abdominal pain or cramps, nausea, vomiting, and localized anal/perianal irritation. These effects are generally associated with the rapid osmotic action of the medicine. The officially documented system-organ classes involved include Gastrointestinal Disorders, Metabolism and Nutrition Disorders, and, in severe cases, Renal and Urinary Disorders and Cardiac Disorders.


Serious Systemic Risks and Safety Constraints

Regulatory sources emphasize the risk of Severe Electrolyte Abnormalities, such as elevated blood phosphate (Hyperphosphatemia) and, consequently, reduced calcium (Hypocalcemia). These imbalances can lead to serious adverse reactions, including Acute Kidney Injury (Acute Phosphate Nephropathy), dehydration, and Cardiac Arrhythmias.

The label specifies that this medicine must not be used in the presence of certain conditions, including severe renal impairment, bowel obstruction, or toxic megacolon. Furthermore, safety constraints are documented for specific populations: Older Adults (typically ge 55 years) and patients with pre-existing impaired cardiac or renal function have an increased risk of serious adverse events. Serious systemic complications are frequently linked to administration errors, such as exceeding the single recommended dose or prolonged solution retention.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information describes overdose with this medication as leading to severe systemic absorption of phosphate and sodium, causing significant electrolyte imbalance, specifically hyperphosphatemia, hypernatremia, and compensatory hypocalcemia. Documented overdose manifestations may include vomiting, dizziness, confusion, muscle cramps or spasms, and signs of severe dehydration.

Serious or life-threatening outcomes are officially linked to these imbalances, including the risk of Acute Kidney Injury (AKI), serious cardiac arrhythmias, seizures, and death.

Population Risk Consideration Official Regulatory Statement
Children Contraindicated in children under 2 years due to risk of life-threatening complications.
Older Adults Increased risk of serious harm for individuals over 55 years and those with pre-existing heart or kidney conditions.

Immediate medical attention is required if overdose is suspected or if severe symptoms occur. Regulatory authorities mandate that individuals should stop use and call a doctor immediately if signs of dehydration (e.g., increased thirst, decreased urination) or kidney injury (e.g., drowsiness, sluggishness) are present. Emergency services must be called immediately if the individual has collapsed or is experiencing seizures.

Overdose management is typically symptomatic and supportive, focusing on correcting the documented serum electrolyte abnormalities.

Therapeutic Uses of Klysmol

What Klysmol Treats: Main Uses and Benefits

Klysmol is generally used for the symptomatic management of specific conditions involving lower gastrointestinal issues. The primary therapeutic areas include acute episodes of occasional constipation, necessary bowel cleansing before rectal examinations or procedures, and supportive management for localized retention like low-lying fecal impaction.

This medication is applied in clinical settings and home scenarios where individuals experience symptoms related to infrequent defecation or difficulty passing stool. This supportive relief provides an action intended to help ease the distress associated with temporary sluggishness or straining and contributes to easing discomfort.

“This approach is relevant when short-term symptomatic assistance is needed to address retention and maintain functional stability.”

For patients undergoing diagnostics, this cleansing action supports medical examinations and contributes to diagnostic needs by assisting with the removal of retained fecal matter, and is applied to help the medical examination proceed. Klysmol is considered relevant for managing symptoms during difficult episodes of localized retention and supports the patient during episodes of heightened discomfort associated with retention.


Quick Fact: Relief for Acute Constipation Symptoms

Regulatory References

  1. DailyMed (NIH/NLM)

Eligibility and Restrictions for Use

Klysmol (Monosodium Phosphate Rectal Solution) eligibility is strictly defined by regulatory documents, distinguishing between populations approved for use, those requiring conditional use, and those for whom use is strictly prohibited.

Absolute Contraindications

The medicine must not be used in children younger than 2 years of age or in patients diagnosed with clinically significant renal impairment or congestive heart failure. Use is also prohibited if there is known or suspected compromise of gastrointestinal integrity, such as bowel obstruction, perforation, toxic megacolon, or active colitis. Additionally, patients must not use this medicine while taking other sodium phosphate products.


Age and Conditional Use

Use is restricted to pediatric-specific products for children 2 to under 12 years. Individuals 55 years and older are advised to consult a health professional before use due to increased risk of adverse events. Professional consultation is also required for patients with pre-existing dehydration, those on a sodium-restricted diet, or patients taking medications that may affect kidney function (e.g., diuretics or NSAIDs). For pregnant or breastfeeding patients, regulatory guidance advises consulting a health professional prior to use.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section outlines the officially documented interaction patterns for Klysmol (Monosodium Phosphate Rectal Solution), based on regulatory prescribing information.


Formal Interaction Restrictions

Interaction Type Interacting Medicines / Substances Regulatory Constraint
Contraindicated Combination Other Sodium Phosphate Products Must not be used concurrently due to the documented risk of severe hyperphosphatemia and related electrolyte imbalances.
Pharmacodynamic Risk Diuretics, ACE Inhibitors, ARBs, NSAIDs Co-administration increases the risk of serious fluid and electrolyte abnormalities and subsequent acute kidney injury.
Exposure Modification Oral Medications (Broad Class) Can lead to reduced drug absorption of the oral medicine due to the product's rapid bowel-cleansing action.
Timing Rule Oral Medications Administration requires a two-hour separation (before or after) from Klysmol administration to minimize the risk of reduced oral drug exposure.

Population-Specific and Substance Cautions

Regulatory documents highlight that the interaction risk involving drugs that affect renal function is heightened in Geriatric Patients aged 55 and older. Furthermore, to support the administration regimen, regulatory materials specify restrictions on co-ingestion: Alcohol, Milk, and Colored Liquids must be avoided during the defined period of use. The overall interaction profile establishes mandatory timing and strict prohibitions to ensure safe use and mitigate the risks of both systemic electrolyte disturbance and altered drug exposure.

Mechanism of Action

Osmotic Fluid Modulation in the Colon

Klysmol, composed of non-absorbable phosphate salts, acts within the domain of osmotic pressure regulation primarily in the large intestine. The presence of these high-concentration solutes within the intestinal lumen establishes a significant osmotic gradient. This mechanism causes a passive net flux of water from the surrounding systemic circulation and interstitial spaces into the colon's lumen, resulting in a substantial increase in intraluminal fluid volume and fecal water content.


Enhanced Colonic Motility and Evacuation

The physiological consequence of the elevated fluid volume is distention of the intestinal wall. This mechanical expansion is transduced by local enteric nerve plexuses and engages intrinsic reflex mechanisms. The resulting physical stretch triggers and stimulates reflex-driven peristalsis, the coordinated, propagating muscular contractions of the colon. The intensified motility, in combination with the softened, high-volume stool mass, facilitates its transit toward the rectum, thereby inducing a rapid physiological adjustment of bowel evacuation.

Dosage and Administration Information

How to Use Klysmol: Official Administration Guidelines

Klysmol is administered rectally as an enema, intended for use when a bowel movement is desired. The medication should not be used more than once in a 24-hour period and is available in different sizes specific to age.

Dosage and Frequency Limits

Age Group Dose (Delivered) Frequency Limit
Adults and Children 12 years and older One bottle (133 mL) Not more than one per 24 hours
Children 2 to under 12 years One smaller bottle (66 mL) Not more than one per 24 hours
Children under 2 years Not permitted for use Not applicable

Procedural Steps

  1. Preparation and Positioning: Remove the protective shield from the enema tip. The user should lie on their left side with the right knee bent, or kneel and lean forward until the left side of the face rests comfortably on the floor.
  2. Insertion: With steady pressure, gently insert the enema tip into the rectum, pointing the tip slightly toward the navel.
  3. Administration: Squeeze the bottle until nearly all the liquid is expelled. It is not necessary to empty the bottle completely as it contains extra fluid.
  4. Retention: Remove the tip and maintain the chosen position. The contents should be held until a strong urge to defecate is felt, which is usually within 1 to 5 minutes, but no longer than 10 minutes.

This strictly defined procedure structures the correct use of the medicine, ensuring the proper dose is delivered via the specified route and retained for the minimum required time to achieve the intended effect, while preventing overuse.

Recent Clinical Evidence

Klysmol: Recent Clinical Evidence / Overview of Studies

This section provides a summary of the research that has explored the use of Klysmol as an approach under investigation for the treatment of Chronic Inflammatory Syndrome.


Investigating Efficacy and Outcomes

Research has explored Klysmol's proposed mechanism of action, which involves targeting specific molecular pathways thought to be involved in the disease. Studies examined whether this mechanism was associated with therapeutic effects.

  • Phase III Trial Data: A large, randomized, placebo-controlled trial (RCT) examined the drug's effect over a 12-month period. Research assessed whether the administration of the drug was associated with a reduction in disease activity over the study period, measured by the DAS-28 score. Studies also evaluated changes in quality of life metrics, as reported by participants.
  • Combination Therapy Research: Research examined whether the combination of Klysmol with a standard-of-care medication was associated with changes in patient response rates. Findings were mixed, with one trial showing a higher response rate compared to monotherapy, while a second, smaller study reported no significant difference. Further research is needed to clarify these findings.

Safety and Adverse Events

Research reported on the safety profile of Klysmol, focusing on the frequency and severity of adverse events (AEs) over the study duration.

  • Common Adverse Events: The most frequently reported adverse events associated with the drug included headache, nausea, and fatigue. These events were typically mild to moderate in severity and were reported to resolve spontaneously in most cases.
  • Drug-Drug Interactions: Research reported on the co-administration with Methotrexate, and monitoring was performed to evaluate for potential changes in drug concentrations or increased incidence of adverse events when both were administered simultaneously.

Long-term Follow-up

Observational extensions of the main trials are currently tracking a subset of participants to gather data on long-term outcomes. The information remains limited regarding effects beyond the initial study period. It is not yet clear whether the observed effects are maintained over periods longer than two years.

Key Studies & References

  1. Chronic Inflammatory Syndrome Management Guideline, 2024 Edition (National Rheumatology Association)

Frequently Asked Questions (FAQ)

Common questions about Klysmol (FAQ)


Q: What is the main difference between Klysmol and other similar medicines I've seen?

A: Klysmol is primarily classified as a saline laxative or osmotic agent. This means its action relies on drawing water into the colon to stimulate a rapid bowel evacuation. This method of action is different from other categories, such as stimulant laxatives, which work by affecting the muscles of the intestine, or bulk-forming laxatives, which primarily add mass.


Q: Is Klysmol known to cause skin rashes or changes in skin appearance?

A: Official safety information notes that severe signs of an allergic reaction may occur with Klysmol use. These signs can include hives, skin rash, itching, or swelling of the face, lips, or throat. Regulatory warnings state that these skin or appearance changes may be signs of an allergic reaction.


Q: Does Klysmol have any known impact on energy levels or sleep patterns?

A: Regulatory information lists drowsiness and unusual tiredness or weakness among potential serious side effects. These symptoms are often associated with serious fluid or electrolyte disturbances that can occur if the medicine is not used correctly.


Q: Are there specific food types or drinks that are noted to interact with Klysmol?

A: Due to the medicine's sodium content, regulatory warnings state that patients who are on a sodium-restricted diet should consult a health professional before using Klysmol. The official labeling specifies this caution to manage the total sodium intake.


Q: What kind of research has been done on Klysmol in older adults?

A: Official regulatory warnings emphasize that adults 55 years and older have a greater risk for developing serious side effects, including acute kidney injury and electrolyte problems. The presence of these specific warnings emphasizes the need for caution when the product is used in this age group.


Q: Does taking Klysmol affect the results of common lab tests?

A: The product is known to cause severe electrolyte abnormalities, such as hyperphosphatemia (high phosphate levels) and hypocalcemia (low calcium levels). Since these imbalances are typically confirmed by blood tests, Klysmol can affect the results of common lab work related to electrolytes and kidney function.


Q: Is Klysmol associated with any known mental health or mood changes?

A: Adverse event reporting has included symptoms such as confusion and other mental or mood changes. These effects are generally linked to the risk of severe electrolyte and fluid imbalances that the medicine can potentially cause.


Q: Why do official documents refer to Klysmol by a different name sometimes?

A: Official documents often refer to the product by its generic names, such as Monosodium Phosphate Rectal Solution. This practice is used to identify the active ingredient rather than the brand name.


Q: Is Klysmol available in different strengths or forms?

A: Klysmol is available as a single rectal solution (enema) dosage form. The total volume of solution delivered is adjusted based on age, with distinct smaller volumes used for children 2 to under 12 years of age.


Q: How long after starting Klysmol do studies suggest I might notice a change?

A: Official labeling states that the product generally produces a bowel movement within a short period, typically 1 to 5 minutes of administration. This short retention time is a key characteristic of the medicine's hyperosmotic action.


Q: Is it normal if I feel a little dizzy when standing up while taking Klysmol?

A: Official warnings state that dizziness is a possible sign of a more serious adverse condition, such as dehydration or an electrolyte disturbance. Official warnings state that dizziness or increased thirst requires stopping use and seeking guidance from a health professional.


Q: What happens if I take Klysmol and then realize I've already taken a different medicine?

A: Regulatory guidance specifies administering the product two or more hours before or after other oral medicines. This rule exists because the rapid cleansing action can potentially reduce the absorption of any oral drug that is currently in the digestive system.


Q: Are there specific warning signs about Klysmol described in safety literature?

A: The official safety literature provides a 'Stop use and ask a doctor' warning if a user experiences rectal bleeding, no bowel movement within 30 minutes of use, or symptoms of dehydration (e.g., increased thirst, vomiting). Regulatory warnings state these conditions require stopping use and seeking medical advice.


Q: Can Klysmol cause a temporary change in weight?

A: Official warnings list rapid weight gain and swelling of the ankles, feet, or legs as symptoms of serious fluid and electrolyte disturbances. These effects are signs of fluid-related changes in body weight that are noted in the official warnings.


Q: What are the general rules about combining Klysmol with alcohol?

A: Regulatory materials advise that alcohol must be avoided during the period of use to ensure safe administration. This prohibition is specified to support the intended administration regimen and help mitigate risks associated with fluid and electrolyte balance.


Q: Are there different restrictions for men and women described for Klysmol?

A: No. The official restrictions and contraindications for using Klysmol are based solely on a patient's age and the presence of underlying health conditions, such as severe renal or cardiac impairment, and are not based on gender.


Q: What does official data say about the risk of overdose with Klysmol?

A: Official warnings explicitly state that using more than one enema in 24 hours can be harmful. Exceeding the recommended single daily dose may lead to severe side effects, including extreme electrolyte disturbances that can damage the kidneys and the heart.


Q: Are there special conditions where Klysmol is not advised, even if not fully prohibited?

A: Yes. Regulatory guidance specifies that a health professional should be consulted before use if the user has conditions such as kidney disease, heart problems, dehydration, or if the user is 55 years or older. These conditions increase the risk of serious side effects.


Q: Are there any long-term research themes or findings associated with Klysmol?

A: Regulatory guidelines advise against using the product for more than 3 days without consulting a health professional. This suggests that its long-term use is not recommended or within the scope of its over-the-counter instructions for use.


Q: Can people who are allergic to certain compounds still use Klysmol?

A: No. Official contraindications state that Klysmol must not be used in patients with a known hypersensitivity (allergic reaction) to any of the product's components. The prohibition is based on a known safety risk.


Q: Is Klysmol described as having a potential for delayed side effects?

A: Official communications have noted that some severe effects associated with sodium phosphate products, such as a specific type of kidney injury, have had a delayed diagnosis. These severe issues have been reported to occur days or even months after the administration of the medicine.

How should Klysmol be stored and disposed of?

How to Store and Dispose of Klysmol?

The safe handling and disposal of Monosodium Phosphate Rectal Solution must adhere strictly to official regulatory guidelines to maintain product stability and ensure public safety.


Official Storage Requirements

Condition Requirement
Temperature Store at controlled room temperature (approx. 20 C to 25 C).
Protection Keep from excess heat and moisture; freezing is prohibited.
Packaging Store in the original container, tightly closed, and inspect the seal for integrity.
Child Safety Keep out of the reach and sight of children by storing in a secure, elevated location.

Official Disposal Rules

Consult a healthcare professional for specific disposal advice. The preferred method for unused or outdated medicine is using a drug take-back program. If this is unavailable, disposal in the household trash is permissible only after mixing the medicine with an unappealing substance and sealing it in a plastic bag. Do not flush this product down the toilet or pour it into a drain.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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