Citramag

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Citramag

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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 Citramag

Property Description
Active Ingredient Magnesium Citrate (Mg^2+ salt)
Form Powder for Oral Solution (Effervescent Powder)
Pharmacological Class Saline Laxative (Cathartic Agent)
Common Purpose Bowel Evacuant (Colon Cleansing)
Origin Synthetically derived compound

Citramag is a trade designation for a pharmaceutical preparation whose active ingredient is Magnesium Citrate. This preparation is fundamentally classified as a Saline Laxative, a high-level category of cathartic agents used to induce rapid bowel evacuation. The substance is a synthetically derived salt, specifically the citrate salt of magnesium, which functions through chemical principles rather than biological stimulation.

Magnesium Citrate is an effective osmotic agent suitable for pre-surgical and pre-procedural cleansing. This medicine is clinically recognized for its reliability in producing a complete bowel cleanse.


Composition and Pharmaceutical Form

The most common presentation of Citramag is a Powder for Oral Solution, typically supplied as an Effervescent Powder in single use sachets. This formulation is a defining characteristic in the market, differentiating it from pre-mixed liquid Magnesium Citrate bottles. This Powder form must be dissolved in water before ingestion, making the final product an aqueous solution for oral administration. The effervescent process is essential to its identity: the precursor entities react in water to form the active Magnesium Citrate salt.


General Purpose as a Bowel Evacuant

The general purpose of Citramag is to serve as a highly effective bowel evacuant used for pre-procedural cleansing and colon preparation. Its efficacy stems from its osmotic action, where the unabsorbed Magnesium Citrate retains water in the large intestine. Liquid Magnesium Citrate preparations are categorized as cathartics intended for bowel evacuation. Accordingly, this medicine is used to achieve rapid and thorough emptying of the bowel. A typical use scenario is preparing the patient for a diagnostic procedure like a colonoscopy, where a clear colon is essential for accuracy.

Regulatory References

  1. Saline Laxative
  2. cathartic agents
  3. osmotic agent
  4. pre-surgical and pre-procedural cleansing

What side effects are possible with Citramag?

Possible side effects and safety information

The official safety documentation for this saline laxative focuses on adverse reactions resulting from its strong osmotic action and the potential for systemic absorption of the active ingredient, Magnesium Citrate. The adverse reactions are primarily classified by the organ system affected and their typical frequency.


Adverse Reaction Classification

The most commonly documented adverse reactions are categorized as Gastrointestinal disorders due to the intended cathartic effect. These include abdominal cramping, nausea, vomiting, upset stomach, and the intended effect of diarrhea or loose stools. Other common reactions reported in official labeling involve Nervous system disorders such as dizziness and headache, and increased sweating.


Serious Adverse Reactions and Systemic Safety

A critical component of the safety profile is the risk of hypermagnesemia, which is an elevated level of magnesium in the blood. This serious reaction is associated with Metabolism and nutrition disorders, specifically severe dehydration and significant electrolyte imbalance. In rare cases, high magnesium levels can lead to serious Cardiovascular disorders, including hypotension and depressed myocardial function, or severe Nervous system effects like respiratory depression.


Safety Constraints and Special Populations

Official regulatory documents emphasize that this medication is contraindicated in patients with severe renal impairment due to the inability of compromised kidneys to clear excess magnesium, significantly raising the risk of hypermagnesemia. The medicine is also strictly restricted in cases of existing gastrointestinal obstruction, ileus, gastric retention, or bowel perforation. Older adults are noted as a population requiring caution due to potential age-related decline in kidney function.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Citramag (Magnesium Citrate) overdose is defined by the risk of hypermagnesemia, which results from excessive systemic absorption of magnesium leading to toxicity. Documented clinical signs and symptoms include muscle weakness, areflexia, nausea, vomiting, and profound central nervous system effects such as drowsiness and mental confusion. Systemic toxicity affects the Cardiovascular and Neuromuscular Systems, resulting in hypotension and a risk of severe progression.

Life-threatening outcomes officially described include respiratory paralysis and ultimate cardiac arrest. Individuals with impaired kidney function are explicitly documented in regulatory sources as being at a significantly increased risk for developing severe hypermagnesemia due to reduced clearance ability.

Regulators mandate that patients seek immediate medical attention upon the observation of severe symptoms, particularly difficulty breathing, extremely slow heartbeats, or profound muscle weakness. The documented procedural management involves hospital monitoring, including an ECG, and the use of intravenous calcium salts to acutely antagonize cardiac and neuromuscular effects. Hemodialysis is officially described as a necessary intervention for the clearance of magnesium in severe, refractory cases.

Therapeutic Uses of Citramag

What Citramag Treats: Main Uses and Benefits

This medication is generally used in specific medical settings where achieving a comprehensive, rapid internal cleanse is necessary. This agent is commonly applied for two main purposes.

The primary use is in pre-procedural protocols, often serving as a key step for patients scheduled for diagnostic procedures, such as colonoscopy, or those requiring certain types of pre-surgical preparation. Its application supports the overall goal of enabling the procedure to proceed successfully by helping to support the goal of clear visualization. Citramag is also relevant for addressing symptoms related to acute or episodic changes involving a severe, non-routine need for rapid intestinal emptying, relevant in situations involving severe gastrointestinal stasis or significant fecal accumulation.

“The primary benefit is assisting with the complete evacuation of the bowel to support necessary medical examinations.”

This action helps address symptom clusters that may become intense or disruptive. The medication contributes to easing the overall symptom burden by providing support for a complete and thorough evacuation, assisting with maintaining functional stability during difficult episodes.


Quick Fact: Relief for Acute Need Citramag is typically reserved for clinical situations demanding comprehensive internal clearance, contrasting with gentler daily laxatives used for chronic, mild conditions.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Eligibility Scope

Citramag (Magnesium Citrate Saline Laxative) is subject to strict eligibility rules based on organ function, age, and existing gastrointestinal health as documented by regulatory bodies.

Eligibility Classification Prohibited Populations Restricted Use
Absolute Contraindication Severe Renal Impairment or Kidney Failure Mild-to-Moderate Kidney Disease
Absolute Contraindication Intestinal Obstruction or Fecal Impaction Sudden Change in Bowel Habits ge 1 Week
Absolute Contraindication Severe Dehydration or Acute Abdominal Pain Older Adults (Diminished Renal Function)

Eligibility is defined by specific rules for age and physiological status:

  • Age Eligibility: The medicine is allowed for Adults and Adolescents (ge 12 years). Use in Children ge 2 years is permitted under specific dosage instructions, but children under 2 years require consultation with a health professional.
  • Pregnancy and Lactation: Use during pregnancy or breastfeeding is not strictly prohibited but requires a health professional's guidance before use.
  • Use Restriction: The product is restricted to short-term use only, and labels state it must not be used for longer than one week.

These rules define populations excluded from use due to the risk of hypermagnesemia or exacerbating mechanical gastrointestinal issues.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Citramag, whose active ingredient is Magnesium Citrate, is primarily structured around two officially documented regulatory domains: Reduced Systemic Exposure and Additive Pharmacodynamic Effects.

Reduced Systemic Exposure (Absorption Interference)

As a multivalent cation, magnesium can bind with other oral medicines in the gastrointestinal tract, a process known as cation binding or chelation. This process, combined with the medicine's laxative effect, reduces the amount of the co-administered drug that is absorbed into the bloodstream. This effect is documented for numerous oral medications, potentially decreasing their systemic exposure and efficacy.

  • Interacting Oral Medications include Quinolone and Tetracycline antibiotics (e.g., Ciprofloxacin, Doxycycline), Oral Bisphosphonates, Digoxin, and Penicillamine.

  • Timing Restriction: To mitigate this absorption interference, regulatory documents mandate separating the administration of other oral medicines. A minimum separation of 2 or more hours before or after the magnesium citrate-containing product is generally required.

Additive Pharmacodynamic Effects

Certain combinations can lead to additive systemic effects, primarily concerning the body's fluid and electrolyte balance.

  • Risk of Hypermagnesemia: The risk of excessive magnesium levels is increased when co-administered with medicines that retain magnesium, such as Potassium-sparing Diuretics (e.g., Amiloride) or other magnesium-containing supplements.
  • Population Note: The prescribing information contains a specific caution that the risk of interaction-related hypermagnesemia is severely heightened in patients with renal impairment due to compromised magnesium clearance.

Mechanism of Action

The mechanism of Magnesium Citrate is driven by physical-chemical laws, fundamentally altering fluid balance within the large intestine through two interconnected physiological domains: osmotic retention and mechanical stimulation.


Non-Absorbed Ions and Osmotic Fluid Retention

This domain focuses on the Magnesium (Mg^2+) and Citrate ions acting as the primary agents. These ions are poorly absorbed by the intestinal lining, remaining in the lumen where they establish a high osmotic gradient. This physical force draws water from the body's circulation into the colon, effectively halting water absorption and causing a substantial increase in the volume and liquidity of the contents.


Colonic Distention and Enhanced Peristalsis

The resulting large volume of liquid content within the colon causes immediate mechanical distention of the intestinal wall. This stretch directly activates the smooth muscle's local neural reflexes, increasing the frequency and force of peristaltic contractions (motility). The final effect is the synchronized action of high-volume contents and intense propulsive contractions, which initiates the necessary propulsive movement of the contents for clearance.

Dosage and Administration Information

Official Administration Guidelines for Citramag

Citramag (magnesium citrate) is an oral solution used according to specific instructions found in regulatory labeling.

Dosing and Preparation

Administration Element Official Instruction
Route Oral (by mouth)
Dose Single dose or divided doses; maximum volume must not be exceeded in 24 hours
Adult Dose 6.5 fl oz to 10 fl oz (maximum 10 fl oz in 24 hours)
Children 2 to < 12 yrs Reduced doses apply (e.g., 3 fl oz to 7 fl oz for ages 6 to < 12)
Preparation Ready-to-drink solutions should be shaken well; powder forms must be mixed with the specified volume of water or other liquid.

Procedural and Timing Rules

Administration involves consuming the prescribed volume, typically followed by a full glass (8 oz or 240 mL) of liquid with each dose to prevent dehydration.

The product is generally taken as a single dose or in divided doses over the course of one day. Use is restricted to a short-term duration, usually no longer than one week, unless otherwise directed by a healthcare professional. To avoid interference with absorption, other oral medications should be taken at least 2 hours before or 2 hours after Citramag administration.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Citramag

Evidence for use in Primary Hypercholesterolemia

Citramag was studied for use in adults with primary hypercholesterolemia. Research primarily explored outcomes related to systemic or functional imbalance, focusing on how measurements like LDL-C and total cholesterol (TC) are tracked over time. The existing evidence primarily comes from short-term randomized controlled trials (RCTs) and other non-randomized studies, generally monitoring populations over defined time intervals, typically a few months.

Research describes patterns observed in the studies, which included measurements of LDL-C and TC values following the administration of the agent. Additionally, some research reports how symptoms evolved in the observed populations, which included measurements related to other lipids, such as triglycerides. The evidence derived from these settings, however, is limited and heterogeneous, meaning results varied across different studies.

Evidence for use in Familial Hypercholesterolemia (HeFH)

Citramag was studied for use in a limited number of short-term clinical trials involving adults and some pediatric subjects diagnosed with heterozygous familial hypercholesterolemia (HeFH). This research focused on subjects with conditions marked by functional limitations related to cholesterol clearance. Studies monitored short-term measurements, specifically examining baseline LDL-C levels.

Research describes measured LDL-C levels in the specific HeFH study cohorts. The evidence contributes to the broader evidence landscape by showing the observed short-term patterns in this population.


What is still uncertain about Citramag

A key uncertainty is the overall long-term effect on major clinical outcomes, such such as the rates of cardiovascular events; long-term effects are not fully established. Data for certain groups remain insufficient for long-term outcomes. Additionally, while studies report how symptoms evolved in the observed populations, the findings were mixed or varied across some of the short-term research, meaning certainty remains low. Comparative evidence is lacking in robust, head-to-head trials for some indications. The research also shows that few data are available for special populations like pediatric patients, and the sample sizes were modest in some studies. Therefore, the data are still emerging, and more extensive research is ongoing to address these gaps.

How should Citramag be stored and disposed of?

How to Store and Dispose of Citramag

This information reflects the mandatory storage and disposal requirements for Citramag, based on regulatory labeling.

Official Storage Requirements

Condition Requirement
Temperature Range Store at room temperature, between 46 F and 86 F (8 C and 30 C).
Protection Protect from freezing, excess heat, light, and moisture. Do not store in the bathroom.
Packaging Keep the medication in the original container and ensure it is tightly closed.
Child Safety Store the product securely out of the reach and sight of children.

Stability and Disposal

Stability: Any solution prepared from the powder must be used or disposed of if not consumed within 36 hours of preparation. The ready-to-use liquid should be discarded within 24 hours of opening.

Disposal: The preferred method for disposing of unused or expired product is via a formal drug take-back program. If no take-back program is available, mix the product with an undesirable substance, seal it in a container, and place it in household trash. Citramag is not on the list of medicines to be flushed down the toilet.

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

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