Dhacopan

Quick links to important sections

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 Dhacopan

Dhacopan: Definition, Active Ingredient, and Class

Property Description
Active ingredient Hyoscine Butylbromide (Butylscopolamine)
Form Tablet, Syrup, Solution for Injection
Pharmacological class Antispasmodic, Anticholinergic
General use Relief of painful smooth muscle spasms
Origin Semisynthetic (Tropane Alkaloid Derivative)

Dhacopan is a powerful antispasmodic medication primarily used to relieve painful spasms and cramps of the internal organs. Its therapeutic effect comes from its single active component, Hyoscine Butylbromide, also referred to as Butylscopolamine.

This medicine is formally categorized as an anticholinergic agent, meaning it acts against the signaling molecule acetylcholine. Hyoscine Butylbromide is a semisynthetic drug, chemically derived from the naturally occurring tropane alkaloid hyoscine, but it possesses a critical modification: its structure as a quaternary ammonium compound. This specialized chemical form ensures the drug remains focused, acting only peripherally on the internal organs and avoiding significant passage into the Central Nervous System (CNS). The drug is available in several dosage forms, including oral tablets, a liquid syrup, and a solution for injection, allowing for both sustained and immediate routes of administration.


How Dhacopan Relieves Spasm and Cramping

The general purpose of Dhacopan is to chemically induce the relaxation of smooth muscles to eliminate the intense pain associated with cramps and colic. It is a dedicated spasmolytic designed to address involuntary, excessive contractions of the muscle walls lining the gastrointestinal tract, the urinary system, and the biliary system.

The drug operates by directly blocking the signals that cause muscle tension. Specifically, it functions as a muscarinic receptor antagonist, intervening in the nerve-muscle pathway to prevent the muscle cells from receiving the message to contract forcefully. Hyoscine butylbromide induces antispasmodic effects on the smooth musculature of the gastrointestinal tract and urogenital organs. By promoting smooth muscle relaxation where the spasm originates, Dhacopan provides relief from the underlying mechanical cause of the discomfort, serving as an effective means to settle painful episodes like abdominal or renal colic.

What side effects are possible with Dhacopan?

Possible Side Effects and Safety Information

The safety profile of Dhacopan (Hyoscine Butylbromide) is formally documented in government regulatory sources, reflecting its action as a peripheral anticholinergic agent. Adverse reactions are grouped by the affected body system and categorized by their frequency, which may vary between the oral and injectable forms.

Frequency-Classified Adverse Reactions

Side effects are officially classified based on the likelihood of their occurrence:

  • Common Reactions (Injection Form): Include an increased heart rate (tachycardia) and difficulty in visual focusing (accommodation disorders).
  • Uncommon Reactions (Oral Form): Typically involve the gastrointestinal system and skin, such as dry mouth, constipation, urticaria (hives), and abnormal sweating.
  • Rare Reaction (Oral Form): Urinary retention (inability to pass water).

Serious Safety Considerations

Post-marketing surveillance reports document serious adverse reactions, often classified as Not Known frequency. These include severe generalized hypersensitivity reactions and anaphylactic shock, which have been associated with fatal outcomes. Severe drops in blood pressure (hypotension) are also noted, especially following the injection.

Population and Risk Notes

The label specifies that adverse effects, particularly following injection, can be more serious in patients with underlying cardiac disease, potentially leading to events such as cardiac arrest. Furthermore, caution is noted for individuals susceptible to narrow angle glaucoma or those with intestinal or urinary outlet obstructions, as the drug’s properties may exacerbate these conditions. The safety profile also advises consideration regarding the use of other anticholinergic medications, which may intensify the observed effects.

Overdose and Emergency Response

Overdose and when to seek help

Overdose of Dhacopan (Hyoscine Butylbromide) is strictly defined in regulatory documents as an acute poisoning characterized by the exaggeration of peripheral anticholinergic effects. These documented manifestations impact the cardiovascular, ocular, gastrointestinal, and urinary systems.

Documented Overdose Manifestations

Clinical Signs Severe Outcomes
Tachycardia, pronounced dry mouth (xerostomia) Severe Tachyarrhythmias
Mydriasis and visual accommodation disorders Marked Hypotension and cardiovascular compromise
Urinary retention, flushing, reduced gut motility Respiratory Depression (documented in extreme cases)

Emergency Action Requirements and Management

Regulatory authorities mandate that any suspected overdose requires immediate medical attention. This urgent action is required due to the potential for the rapid onset of severe or life-threatening manifestations, especially Tachyarrhythmias and Hypotension.

The official management approach is exclusively symptomatic and supportive treatment, as regulatory documents state that no specific antidote is known for Hyoscine Butylbromide. Close hospital monitoring of vital signs, including continuous observation of heart rate and blood pressure, is required for managing cardiovascular instability. The treatment strategy focuses on mitigating the severe signs until the drug is naturally eliminated.

Therapeutic Uses of Dhacopan

What Dhacopan Treats: Main Uses and Benefits

Dhacopan is commonly used in situations involving certain distressing symptoms across several therapeutic domains. The medicine is applied in scenarios where additional management of discomfort is required for symptoms linked to the gastrointestinal and genitourinary systems, addressing conditions involving episodic or fluctuating manifestations, such as those presenting with systemic or localized discomfort.

This medicine is relevant for easing discomfort during symptomatic periods and supports patients during episodes of heightened symptoms. The focus is on providing supportive relief when symptoms interfere with routine activities.

“It contributes to improved day-to-day comfort when symptoms are more noticeable.”

It is generally used to help address symptoms that create noticeable functional strain. This supportive relief is helpful in situations requiring additional symptomatic assistance.

Quick Fact: Relief for Symptomatic Discomfort
Dhacopan is often used during phases when symptoms become more noticeable, particularly in contexts involving heightened systemic burden.

Regulatory References

  1. Health Canada Product Monograph for BUSCOPAN®

Eligibility and Restrictions for Use

Who Can and Cannot Use Dhacopan? — Official Regulatory Information

The eligibility to use Dhacopan (Hyoscine Butylbromide) is strictly defined by regulatory documents, focusing primarily on absolute contraindications and use restrictions for vulnerable populations.

Absolute Contraindications (Must Not Use)

Use is strictly prohibited for patients with Myasthenia Gravis or untreated narrow-angle glaucoma. The medicine must not be taken in the presence of mechanical obstructions in the gastrointestinal tract, such as megacolon, obstructive ileus, or mechanical stenosis. It is also contraindicated for individuals with known hypersensitivity to the medicine or its excipients.

Age and Developmental Status Restrictions

The oral tablet form is not recommended for children under 6 years of age. For pregnant women and those who are breastfeeding, the medicine is not recommended due to limited or insufficient human data in these populations.

Conditional and Restricted Use

The injection form is contraindicated for patients with pre-existing conditions like tachycardia or cardiac failure. Patients with specific risk factors, such as those with prostatic hypertrophy or those on anticoagulant drugs (for IM injection), are subject to restrictions and must use the medicine with caution as directed by regulatory labeling.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Dhacopan (Hyoscine Butylbromide) interacts with other products primarily through pharmacodynamic mechanisms, which can lead to enhanced or diminished effects, as documented in official regulatory labeling.


Pharmacodynamic Interactions

Interacting Substance Class Official Interaction Outcome
Anticholinergic Agents (e.g., tricyclic antidepressants, antihistamines, quinidine, amantadine, disopyramide, some antipsychotics) Intensification of the overall anticholinergic effects (e.g., dry mouth, blurred vision).
Dopamine Antagonists (e.g., metoclopramide, domperidone) Diminution of the gastrointestinal effects of both medicines due to opposing actions on motility.
Beta-Adrenergic Agents Enhancement of tachycardic effects (chronotropic action).

Administration Restrictions and Absorption

Certain combinations and administration methods have documented constraints based on regulatory information:

  • Intramuscular Injection Prohibition: The injectable solution is contraindicated for the intramuscular route in patients who are simultaneously taking anticoagulant drugs due to the reported risk of intramuscular haematoma.
  • Timing Separation Rule: Dhacopan's absorption may be reduced by products that interfere with the digestive tract. Therefore, antacids or adsorbent anti-diarrheals must be administered at least one hour after or significantly separate from the dose of Dhacopan.

No specific CYP-mediated or transporter-based pharmacokinetic interactions are explicitly detailed in core regulatory labeling. Interactions with food, herbal products, or supplements are not formally documented in the official interaction sections.

Mechanism of Action

How Dhacopan Works

Dhacopan (Hyoscine Butylbromide) is an anticholinergic agent that operates by modulating the core signaling pathways that govern smooth muscle movement. Its action is strictly confined to the peripheral nervous system.


Antagonism of Visceral Cholinergic Receptors

The mechanism involves competitive antagonism at the muscarinic acetylcholine receptors (M-receptors), particularly the M2 and M3 subtypes, which are highly concentrated on smooth muscle cells. The drug binds to these receptors, blocking the excitatory neurotransmitter, acetylcholine, from initiating the nerve signal. This antagonistic action also includes a ganglion-blocking effect by affecting nicotinic receptors in the peripheral autonomic ganglia, thereby dampening the nerve signal before it reaches the muscle.


Suppression of the Muscle Contraction Cascade

By blocking the receptor signal, the drug suppresses the subsequent intracellular cascade that relies on the mobilization of calcium ( Ca^2+) ions. Since the calcium-dependent activation of Myosin Light-Chain Kinase (MLCK) is necessary for muscle contraction, this inhibition leads to smooth muscle relaxation (spasmolysis). This molecular sequence results in a fundamental reduction of muscle tone and motility in the gastrointestinal, urinary, and biliary systems.


Strictly Peripheral Mode of Action

The mechanism is defined by its peripheral specificity, owing to the drug's chemical structure as a quaternary ammonium compound. This structure limits its capacity to cross the blood-brain barrier, confining the physiological effect entirely to the peripheral systems.

Dosage and Administration Information

How Dhacopan is Used: Official Administration Guidelines

Dhacopan (Hyoscine Butylbromide) is administered via different routes based on the clinical scenario. The medicine is available as an oral tablet for general use and as a solution for injection for acute situations, which can be given via the intravenous (IV), intramuscular (IM), or subcutaneous (SC) routes.

Standard Dosage and Frequency Patterns

The established usage protocols define both a maintenance range and strict maximum limits. For the oral form, the usual adult dose is 10 mg to 20 mg per administration, taken up to three to four times per day. The total daily intake is generally limited to 80 mg, though some regional labeling may specify up to 120 mg.

For the parenteral injection used in acute settings, the standard dose is 20 mg. This 20 mg dose may be repeated after 30 minutes if needed, but the total dose administered must not exceed 100 mg within 24 hours. The oral dose for children aged 6 to 12 years is typically 10 mg administered three times daily. No specific dose adjustment is universally cited for older adults.

Administration Context and Duration

Administration conditions are specified to ensure correct use. Oral tablets must be swallowed whole with sufficient fluid. When the medicine is given via the intravenous route, it must be injected slowly over several minutes to mitigate transient cardiovascular effects. The solution for injection may be diluted with standard intravenous fluids, such as sodium chloride 0.9%. The medicine is designated for short-term symptomatic relief; it is not for continuous use for long periods without investigation into the underlying cause of the symptoms. If an oral dose is missed, the regular schedule is continued without taking a double dose.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Research on this therapeutic option primarily focuses on exploring its potential role in managing smooth muscle spasms and investigating its pharmacological properties. The body of evidence consists mainly of early-stage clinical trials and observational studies, with some randomized controlled trials (RCTs) available for specific indications.


Key Areas of Research Focus

Research included endpoints exploring changes in symptom severity, such as abdominal cramping and pain, among study participants. Key research areas include:

A. Symptom Management: Research Aims

  • Initial Research: The drug was examined for its potential effects in addressing spasms of the gastrointestinal and genitourinary systems. Studies evaluated the administration of the drug in cohorts with conditions characterized by painful spasms.
  • Observed Changes: Studies assessed whether a reduction in spasm severity and associated pain could be observed. RCTs in the approved indication have found comparable efficacy to non-opioid pain relievers in reducing abdominal cramps and pain.

B. Safety Profile and Administration

  • Population Focus: Research focused on participants to evaluate its profile, with many studies excluding individuals with conditions such as glaucoma, myasthenia gravis, or certain heart conditions.
  • Study Administration: Study protocols involved specific administration levels and durations; for example, one regimen evaluated oral administration up to a level of 10 mg daily. Study endpoints focused on measuring adverse event rates and monitoring vital signs, with cardiovascular effects (e.g., increased heart rate) being a specific focus.

C. Pharmacological Activity Studies

  • Pharmacology: Research has included studies examining the pharmacological activity of the drug relevant to its antispasmodic effects. These studies focus on its role as a muscarinic receptor antagonist, primarily blocking the action of acetylcholine on smooth muscle cells.

Comparative Research Status

This research is one of the treatment options studied for the condition. Current literature includes RCTs comparing this drug to placebo or other common pain relievers for specific types of cramping pain. Further research is necessary to fully characterize the clinical profile across all potential indications.

Frequently Asked Questions (FAQ)

Common questions about Dhacopan (FAQ)

Q: What is the active ingredient in Dhacopan?

According to official product descriptions, the active ingredient in Dhacopan is Hyoscine Butylbromide.

Q: What conditions does Dhacopan treat according to regulatory documents?

Regulatory documents indicate that Dhacopan is used to help relieve smooth muscle spasm (cramping) in the gastrointestinal, biliary, and genito-urinary tracts. It is also indicated for the symptomatic relief of Irritable Bowel Syndrome (IBS).

Q: Are there any known serious, but rare, side effects associated with Dhacopan?

Yes, official safety information mentions rare, serious events. These include severe allergic reactions (such as anaphylactic shock) and a painful red eye with loss of vision. These events are described as severe and require immediate medical evaluation.

Q: What are the most frequently reported side effects listed in official documents?

The most frequently reported side effects are described as uncommon, meaning they may affect up to 1 in 100 people. These include a dry mouth, increased heart rate, and abnormal or reduced sweating.

Q: Is it normal to feel slightly dizzy when first starting Dhacopan?

Yes, dizziness is listed as an adverse reaction in the official product information.

Q: Why do some patients report feeling tired when starting Dhacopan?

Official documents mention the potential for drowsiness (a form of tiredness). This is sometimes noted as a side effect that may be increased by concurrent alcohol use.

Q: Are there official warnings about driving or operating machinery while using Dhacopan?

Official warnings state that some people may temporarily experience sight problems or dizziness. If this happens, the official warnings advise waiting until sight returns to normal before driving or using tools or machines.

Q: Is Dhacopan recommended for short-term or long-term conditions?

Official patient information states that the tablets should not be taken continuously for long periods of time. This guidance suggests the medicine is typically intended for acute symptoms or short-term use.

Q: Does taking Dhacopan for a long time increase the risk of any long-term issues?

Official patient information explicitly states that the medicine should not be taken continuously for long periods of time. Official documents contain further information regarding limitations on continuous use.

Q: Is it necessary to take Dhacopan with food?

Official guidance instructs patients to take the tablets with water. There is generally no specific requirement to take them with food.

Q: What food or drinks are specifically listed in official documents as potentially interacting with Dhacopan?

Official product information notes that alcohol may increase the chance of experiencing side effects like drowsiness.

Q: Is there a described interaction between Dhacopan and alcohol in the product information?

Yes, official guidance notes that the consumption of alcohol may increase the severity of side effects such as drowsiness while taking Dhacopan.

Q: Is there a list of drug classes that should generally not be taken with Dhacopan?

Yes, official documents list drug classes whose anticholinergic effects may be intensified when taken with Dhacopan. These classes include certain antidepressants (tricyclic/tetracyclic types), some antihistamines, and quinidine.

Q: Are there specific medical conditions that may prevent someone from using Dhacopan?

Yes, Dhacopan has several regulatory contraindications. These conditions include myasthenia gravis, an enlarged colon (megacolon), and certain types of eye pressure issues (narrow-angle glaucoma).

Q: Does a history of heart issues typically rule out the use of Dhacopan?

Official guidance indicates that patients with a history of heart problems should discuss this with a healthcare professional before use. For the injectable form, its use is contraindicated in patients with a very fast heart rate (tachycardia).

Q: Is a dose adjustment typically necessary for patients with kidney or liver problems?

Official information indicates that for patients with various stages of renal impairment (kidney problems), the dose is generally the same as in normal renal function.

Q: Is Dhacopan described as being suitable for use in pediatric patients?

Official documents provide specific dosage instructions for children aged 6 to 12 years for the oral tablet form. The safety and effectiveness in children younger than 6 years has generally not been established for the oral tablets.

Q: What is the official information regarding Dhacopan use during pregnancy?

Use during pregnancy is generally not recommended, especially in the first three months. Official advice notes that special care may be required, and some documents advise against use if pregnant or planning to be.

Q: Is Dhacopan known to pass into breast milk, according to regulatory data?

Official information confirms that the drug is excreted in human milk, and therefore requires careful consideration when administered to a nursing woman.

Q: Where can a patient find the official prescribing information or package insert for Dhacopan?

Official documents typically provide the website address of the regulatory body (such as the MHRA or Health Canada) where patients can find the full official prescribing information, the package insert, and a method to report any side effects.

How should Dhacopan be stored and disposed of?

How to Store and Dispose of Dhacopan

The required storage conditions for Dhacopan (Hyoscine Butylbromide) vary by formulation, but all forms must be protected from light and kept out of the sight and reach of children.


Official Storage Conditions

Formulation Required Storage Temperature
Tablets Store below 30 C
Syrup Store below 25 C
Solution for Injection Store below 25 C

The Solution for Injection must also not be frozen, and the ampoules should remain in the outer carton for protection. Do not use any product after the expiry date.

Disposal

All unused or expired Dhacopan must be disposed of in accordance with local requirements. The medicine should not be discarded via wastewater or household trash.

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

Available in countries:

Equivalent of Dhacopan found in:

A-Z Index: