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Spasmex (Phloroglucinol)

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Spasmex (Phloroglucinol)

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Medically reviewed

Rosario Oropesa

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.

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Overview of Spasmex (Phloroglucinol)

Spasmex is a medication based on the active ingredient Phloroglucinol, a synthetic compound classified as a spasmolytic agent. It is designed to provide relief by acting as a musculotropic agent, directly targeting and relaxing the smooth muscle fibers in internal organs. The medicine is a monocomponent product, focusing its action exclusively on the primary therapeutic target.


Quick Facts

Property Description
Active ingredient Phloroglucinol (INN)
Forms Tablet, Suppository, Solution for injection
Pharmacological class Non-atropinic Antispasmodic, Musculotropic agent
General Purpose Relief from smooth muscle spasms and associated discomfort
Origin Synthetic (Chemically derived)

What Type of Medicine is Spasmex (Phloroglucinol) and Its Pharmacological Class?

Phloroglucinol is a non-atropinic antispasmodic medication, a class specifically engineered to relax smooth muscle fibers in the body's internal systems. This substance is officially categorized as a spasmolytic agent because its primary function is to ease or dissolve spasms. Phloroglucinol is further defined as a musculotropic agent, which means it exerts its effect directly on the smooth muscle cell, without relying on anticholinergic mechanisms (a common pathway for older antispasmodics). This compound is utilized for conditions characterized by smooth muscle spasms, highlighting its targeted, peripheral action as a key differentiating feature from other classes of pain relievers.


Composition and Available Pharmaceutical Forms

The active ingredient in Spasmex is Phloroglucinol, and it is available in pharmaceutical preparations designed for oral, rectal, and parenteral administration. As a monocomponent medication, Phloroglucinol is the sole active entity (INN: Phloroglucinol). This product is often commercially positioned for use in adults and adolescents, and its availability in a sterile solution for injection is a significant differentiating factor, allowing for rapid onset of action when required for acute situations. The chemical structure of Phloroglucinol is known as 1,3,5-trihydroxybenzene, which is the core synthetic entity used in these formulations.


General Purpose: How Does Phloroglucinol Relieve Discomfort?

The general purpose of Phloroglucinol is to relieve pain and discomfort that is directly caused by the cramping and tightening of smooth muscles within the organ systems. It achieves this core benefit by acting as a direct smooth muscle relaxant, easing the involuntary spasms that can affect various internal passages. Spasmolytic agents function to specifically relieve discomfort arising from muscle contractions. This mechanism allows the medication to restore a state of relaxation and alleviate the associated spasmodic discomfort by directly interrupting the muscle tension, a typical use scenario being the relief of general abdominal discomfort linked to smooth muscle tension.

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What side effects are possible with Spasmex (Phloroglucinol)?

Possible Side Effects and Safety Information

The safety profile of Phloroglucinol, as documented in official regulatory sources, primarily involves reactions categorized within the Immune System Disorders and Skin and Subcutaneous Tissue Disorders.

All officially documented adverse reactions are classified with a frequency of Not Known. This classification is used because these effects are identified through post-marketing surveillance, meaning their true incidence cannot be reliably estimated from clinical trial data.


Documented Adverse Reactions and Safety Constraints

The most significant safety focus is on hypersensitivity reactions. These reactions range from milder skin manifestations, such as pimples or redness of the skin and itching, to severe and clinically significant events.

Serious adverse reactions documented in product information include systemic and life-threatening conditions such as anaphylactic shock (a sudden drop in blood pressure) and Quincke's oedema (sudden swelling of the face and neck). Additionally, a severe skin disorder known as Acute Generalized Exanthematous Pustulosis (AGEP) is listed, which may specifically appear when treatment starts.


Population-Specific Safety Notes

The official labeling includes specific safety constraints related to certain patient groups and co-administered substances:

  • Co-administration Restriction: There is a safety restriction against combining Phloroglucinol with major analgesics, such as morphine or morphine derivatives, due to the potential for these agents to provoke muscle spasms.
  • Ingredient Constraints: Individuals diagnosed with phenylketonuria (PKU) are constrained from using certain oral formulations containing aspartame. Similarly, formulations containing lactose monohydrate carry a specific note for patients with known sugar intolerances.
  • Use during Pregnancy: Use during pregnancy or breastfeeding is conditional, advised only when specifically recommended by a healthcare professional.
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Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documents concerning Spasmex (Phloroglucinol) overdose establish a profile defined by the absence of specific clinical signs. In reported cases, official labeling notes that overdose has occurred without any specific symptomatology being documented. Due to this lack of distinguishing signs or symptoms, the regulatory guidance emphasizes immediate action following any suspected accidental over-ingestion.


Required Emergency Actions

Urgent medical help is always required following a suspected overdose. The official prescribing information mandates that if a patient takes too many tablets, they must contact their nearest hospital casualty department or tell their doctor immediately. This action is mandatory because no specific features exist to safely monitor the situation at home.


Management and Monitoring

Management of a Phloroglucinol overdose is limited to general symptomatic and supportive treatment. The official documentation states that there is no known antidote or specific agent to reverse the effects of the medication. As part of this required management, clinical observation and hospital monitoring may be necessary. The regulatory data does not explicitly define differential overdose risks or management considerations for specific populations such, as the elderly or those with organ impairment.

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Therapeutic Uses of Spasmex (Phloroglucinol)

What Spasmex (Phloroglucinol) Treats: Main Uses and Benefits

Phloroglucinol is primarily applied across domains where additional symptomatic support is needed to address symptoms that create noticeable physiological strain. The core therapeutic goal is to ease discomfort related to increased tension, which often presents as symptoms of physical discomfort.

It is commonly used across conditions presenting with acute episodes characterized by symptoms linked to organ-specific functional stress. This includes the gastrointestinal tract, the biliary tract, the urinary tract, and the gynecological systems.

This medication is often used during phases when symptoms become more noticeable, offering symptomatic relief that helps patients cope more steadily with symptom fluctuations.

“The support helps ease the overall symptom burden.”

The treatment may be part of symptomatic management in settings where short-term symptom stabilization is important, supporting patients during difficult episodes by easing distress.


Quick Fact: Support for physical discomfort (Digestive, Urinary, and Gynecological Systems)

Regulatory References

  1. French Health Authority (HAS) Opinion
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Eligibility and Restrictions for Use

Who can and cannot use Spasmex (Phloroglucinol)?

Official regulatory sources establish specific eligibility and contraindication rules for the use of Phloroglucinol. This medicine is contraindicated for patients with a known hypersensitivity or allergy to phloroglucinol or any of its excipients.

Contraindicated and Restricted Groups

Classification Population/Condition Restriction Basis (Official Statement)
Contraindicated Phenylketonuria (PKU) Presence of aspartame in the formulation.
Contraindicated Rare hereditary problems Galactose intolerance, Lapp lactase deficiency, or glucose-galactose malabsorption (if product contains lactose).
Not Recommended Children under 12 years of age Efficacy and safety data are lacking for this age group in some formulations.
Not Recommended Breast-feeding women Use should be avoided in the absence of data.
Special Consideration Pregnancy Use should only be considered if necessary. Epidemiological studies are required to verify the absence of risk.

For children, use in those under 2 years of age is not established. Use in adults and children over 2 years of age is generally allowed, but treatment for children under 12 is often not recommended. Severe liver impairment also requires special caution, as use is generally not recommended due to limited data.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Spasmex (Phloroglucinol) defines a specific and limited interaction profile, primarily focused on preventing pharmacodynamic conflicts.

Documented Interaction and Restrictions

Category Interaction Description Restriction Level
Major Analgesics The spasmolytic (spasm-relieving) effect is counteracted by the spasmogenic (spasm-causing) action. Avoid Co-administration
Specific Agents Morphine and its derivatives Avoid Co-administration

The most significant, formally documented interaction involves major analgesics, such as morphine and its derivatives. Regulatory labels explicitly state that co-administration must be avoided because these analgesics can induce spasms, directly antagonizing the intended smooth muscle relaxing effect of Phloroglucinol. This is classified as a significant pharmacodynamic incompatibility.

Absence of Documented Pharmacokinetic Interactions

Regulatory prescribing information generally does not detail interactions with Phloroglucinol concerning common pharmacokinetic pathways. Specifically, official labels do not explicitly document interactions related to:

  • CYP Enzymes: No statements regarding inhibition or induction of cytochrome P450 (CYP) enzymes or any subsequent alteration of drug clearance or exposure (AUC/Cmax).
  • Drug Transporters: No explicit mention of interactions involving drug transport proteins like P-glycoprotein (P-gp), OATP, or BCRP.
  • Other Substances: There are no explicit regulatory warnings regarding interactions with food, alcohol, herbal products, or supplements.
  • Timing or Population: No mandatory timing separation rules or population-specific cautions (e.g., for hepatic impairment) are documented in relation to interaction severity.
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Mechanism of Action

Phloroglucinol is a musculotropic antispasmodic agent that acts directly on smooth muscle cells to induce relaxation. Its primary function is to modulate the internal signaling pathways responsible for muscle contraction, resulting in the decrease of smooth muscle tone and attenuation of spasm activity.

Direct Modulation of Smooth Muscle Excitation

This domain covers the agent's action as an inhibitor of voltage-dependent L-type Calcium ( Ca^2+) channels on smooth muscle membranes, which function as the primary trigger for contraction. By reducing the transmembrane influx of Ca^2+ into the cell, the agent directly limits the cellular capacity for contraction, resulting in the relaxation of smooth muscle fibers in the visceral organs.

Interference with Cyclic Nucleotide Pathways

This mechanism involves the inhibition of Phosphodiesterase (PDE) enzymes, leading to an increase in intracellular levels of the secondary messengers, cyclic AMP (cAMP) and cyclic GMP (cGMP). Elevated cyclic nucleotides promote the dephosphorylation of the myosin light chain, creating a synergistic effect that further enhances muscle fiber relaxation and contributes to the physiological dampening of hyperactive muscle signaling.

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Dosage and Administration Information

How to Use Spasmex (Phloroglucinol)

Phloroglucinol is administered based on standard usage patterns, primarily to manage acute, symptomatic episodes. The medicine is not typically used for continuous, long-term maintenance. Administration is approved across multiple routes, depending on the required speed of onset and clinical context.


Administration Scope

Usage Component Guideline
Route of administration: Oral, Rectal (suppository), and Parenteral (Intravenous or Intramuscular)
Dosing schedule (Adults): Oral Dose: 2 tablets (80 mg each) per acute episode.
Rectal Dose: 1 suppository (150 mg) per acute episode.
Frequency: Used as-needed (symptomatically) when pain occurs.
Time Interval: A minimum 2-hour interval is required between subsequent doses.
Maximum Dose: The maximum intake is 6 tablets (480 mg total) per 24 hours.

Preparation and Procedural Rules

Specific methods for administering the available forms are established. Oral tablets may be taken by dissolving them under the tongue (sublingual route) for rapid effect or by dissolving them in a glass of water before swallowing. Use of the injectable solution is designated for either the intravenous or intramuscular route.

For children over 2 years, the dose is 1 tablet per episode, not to exceed 2 tablets per 24 hours. Efficacy is not established for children under two years. Importantly, the administration of Phloroglucinol must be avoided in conjunction with major spasmogenic analgesics, such as morphine or its derivatives, to prevent counteracting effects on the smooth muscles.

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Recent Clinical Evidence

Research evidence / Overview of Studies for Spasmex (Phloroglucinol)


Evidence for Use in Acute Biliary and Urinary Colic

Phloroglucinol was studied for how it relates to acute outcomes related to physical discomfort and spasms of the biliary and urinary tracts. Research examining these acute episodes typically involved Phase 3 Multicentre Randomized Comparative Studies. The primary focus of these studies was to monitor how symptoms change over time and to monitor the use of rescue medication shortly after administration.

Studies reported measurements of symptom change that were compared against other reference medications used in research for acute colic episodes. However, the existing body of evidence is frequently derived from trials that compare Phloroglucinol to other active treatments rather than to an inactive substance (placebo).

What remains uncertain is the medication’s performance when studied alone in acute settings. Certainty remains low for its use as an add-on therapy, as one study that examined Phloroglucinol as an adjuvant therapy described findings where no significant difference was observed compared to the use of standard care alone.


Research on Uterine Spasms and Labor Progression

Phloroglucinol was evaluated in pregnant women in the active phase of labor. The evidence base consists of numerous Randomized Controlled Trials (RCTs) that have been compiled and analyzed in Systematic Reviews and Meta-analyses. These studies focused on outcomes related to systemic or functional imbalance by measuring the time-based changes in the labor process.

Multiple RCTs reported measurements of changes in the time recorded for the first stage of labor when Phloroglucinol was administered. Trial reports included monitoring of the observed rate of cervical dilation compared to control groups. However, mixed conclusions regarding the consistency and clinical significance of these findings are noted in systematic reviews.


Evidence for Symptom Management in Irritable Bowel Syndrome (IBS)

Phloroglucinol was evaluated in patients with conditions characterized by fluctuating or episodic manifestations, such as Irritable Bowel Syndrome (IBS). The research includes short-term, placebo-controlled trials and subsequent Systematic Reviews. These studies monitored patient-reported outcomes describing perceived discomfort, specifically changes in the intensity of abdominal pain.

Systematic reviews often note that the sample sizes were modest in many of the placebo-controlled studies, and that the evidence base is limited for chronic symptom management. Due to the short duration of most trials (typically a few weeks), there is limited information for long-term outcomes or its sustained effect on symptom patterns.

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Frequently Asked Questions (FAQ)

Common questions about Spasmex (Phloroglucinol) (FAQ)


Q: What is the difference between an antispasmodic and a painkiller?

A: Phloroglucinol is classified as a spasmolytic agent, which is a type of antispasmodic medicine. Its main function is to relax the smooth muscles in organs to relieve pain caused by cramps and spasms. This mechanism is different from how general painkillers (analgesics) work to manage various types of discomfort or pain.


Q: What should I do if a side effect feels severe?

A: If you experience any signs of a severe allergic reaction, such as a sudden drop in blood pressure or sudden swelling of the face and neck, regulatory information advises seeking immediate medical attention. Serious adverse reactions like anaphylactic shock are possible, and official documents describe the need for prompt evaluation if any severe symptom occurs.


Q: What warnings are listed for Spasmex use in children?

A: Official regulatory documents state that the safety and effectiveness of Phloroglucinol have not been established for children under two years of age. For children over two years, specific dose limits and maximum daily intake are defined. However, use in children under 12 is often not recommended in some formulations.


Q: What happens if I miss a scheduled dose of Spasmex?

A: Since this medicine is intended for the symptomatic treatment of acute pain and is used as-needed, regulatory documents do not provide standard instructions for a 'missed dose.' The medication is taken when symptoms of pain or spasm occur, not on a fixed, routine schedule.


Q: How often do people usually take Spasmex?

A: The medicine is taken only as-needed when symptoms occur, not for continuous daily maintenance. Official documents define the maximum daily allowance for adults as six tablets per 24 hours, with a minimum interval of two hours required between subsequent doses.


Q: Does alcohol interact with Spasmex?

A: Official regulatory prescribing information, which details drug incompatibilities, does not contain any explicit warnings regarding interactions between Phloroglucinol and alcohol.


Q: Is Phloroglucinol considered safe during labor?

A: The use of Phloroglucinol during pregnancy is described in regulatory documents as an adjuvant treatment for contractions, but it should be considered only when strictly necessary. Regulatory information indicates that epidemiological studies are required to verify the absence of risk associated with its use during this period.


Q: Why is Phloroglucinol sometimes given by injection?

A: The injectable solution is administered for the treatment of acute, severe spasms. The injectable route allows for a rapid onset of action compared to the oral form, which may be beneficial in acute clinical situations.


Q: Are there different strengths of Spasmex available?

A: Yes, the active ingredient Phloroglucinol is manufactured in several strengths and forms. These typically include 80 mg oral tablets, 150 mg suppositories, and a sterile solution for injection in various concentrations.


Q: Why is Phloroglucinol sometimes described as a spasmolytic?

A: Phloroglucinol is defined as a spasmolytic agent because its principal action is to ease or dissolve spasms. This classification indicates that the medicine directly works to relieve the involuntary contractions of smooth muscle fibers.


Q: Is it common to feel dizzy after taking Phloroglucinol?

A: Dizziness is listed in the official documents as a possible side effect of Phloroglucinol. However, the exact frequency of this effect is officially categorized as Not Known in regulatory documents.


Q: What are the research themes around the long-term use of Spasmex?

A: Current research summaries note that most trials examining Phloroglucinol are short-term. For this reason, official reports highlight that there is limited information available for long-term outcomes or its sustained effect on chronic symptom patterns.


Q: Is there a generic version of Spasmex?

A: Yes, the active substance is Phloroglucinol. This compound is the generic name and is manufactured and sold globally under various brand names, including Spasmex.


Q: Can Phloroglucinol affect my ability to drive?

A: Official product information states that Phloroglucinol typically has no or negligible influence on the ability to drive or use machinery. However, since dizziness is a possible side effect, users are generally advised to be aware of their individual response before operating vehicles or complex equipment.


Q: What is Spasmex used for in pregnancy?

A: Phloroglucinol is indicated in official documents as an adjuvant treatment for contractions during pregnancy, usually in combination with rest. Its use should be assessed on a case-by-case basis by a healthcare professional.


Q: Why do doctors prescribe Spasmex for kidney stones?

A: Phloroglucinol is prescribed for the treatment of acute spasmodic painful disorders of the urinary tract. This indication includes the management of pain associated with renal colic, which is the intense spasmodic pain that occurs when a kidney stone passes.


Q: Is Spasmex the same as Buscopan?

A: Phloroglucinol is classified as a non-atropinic musculotropic antispasmodic, meaning it acts directly on smooth muscles. This mechanism of action differs from other antispasmodics, such as those in the anticholinergic class, which work via nerve receptors.


Q: How quickly does Spasmex usually start to work?

A: The tablets may be taken by dissolving them under the tongue for a rapid effect. The solution for injection is used in acute situations to achieve the fastest possible onset of action.


Q: Does Spasmex stay in your system for a long time?

A: Pharmacokinetic studies indicate that Phloroglucinol is cleared relatively quickly. Most of the substance is eliminated from the system in the first 6 hours after dosing, with a half-life of approximately 1 hour and 40 minutes.


Q: Can I use Spasmex while breastfeeding?

A: Official regulatory advice states that in the absence of data regarding the passage of the substance into human milk, the use of this medicine is generally not recommended while breastfeeding.


Q: Is the research evidence for Spasmex considered strong?

A: Research evidence summaries note that systematic reviews have presented mixed conclusions, and in some specific uses, the certainty remains low. The evidence base is often derived from trials comparing it to active treatments rather than inactive placebos.


Q: Do studies suggest Spasmex is useful for period pain?

A: The research evidence includes numerous studies and systematic reviews evaluating the medication's role in uterine spasms and the symptomatic treatment of painful spasms in gynaecology, which can encompass period pain.


Q: How does Phloroglucinol work on the muscles in the digestive tract?

A: Phloroglucinol is a musculotropic agent that works directly on the smooth muscle cells. It is described as inhibiting the influx of Calcium ions and interfering with internal signaling pathways by inhibiting Phosphodiesterase (PDE) enzymes (which help control muscle contraction). This action results in the relaxation of the muscle fibers.

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How should Spasmex (Phloroglucinol) be stored and disposed of?

Storage and Disposal of Phloroglucinol (Spasmex)

Official regulatory documents define specific environmental and handling requirements for Phloroglucinol to ensure product stability and safety.

Storage Requirements

Condition Requirement
Temperature Store at a temperature below 30°C to prevent degradation.
Protection Keep the product protected from light and store in the original package (blister or tightly closed bottle) to protect from moisture.
Child Safety The medicine must be kept strictly out of the sight and reach of children.

Stability and Disposal

If the medicine is supplied in a bottle, it must be used within one month after the first opening.

Disposal must adhere to environmental regulations: the product must not be discarded via wastewater or routine household waste. Unused or expired medication should be returned to a pharmacist for proper disposal according to local requirements.

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

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