Hiocin

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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 Hiocin

What is Hiocin? (Hyoscine Butylbromide)

Property Description
Active ingredient Hyoscine Butylbromide
Form Tablet, Solution for Injection
Pharmacological class Antispasmodic, Anticholinergic
Common use Relief of visceral muscle spasms
Origin Semisynthetic derivative (of scopolamine)

What Type of Medicine is Hiocin?

Hiocin is a trade name for a medication whose active ingredient is Hyoscine Butylbromide, which is classified primarily as an antispasmodic (spasmolytic) and an anticholinergic agent. The primary function of this pharmacological class is to relieve pain by actively reducing the excessive, involuntary contractions—or spasms—of specific internal muscles. The substance is also identified as Scopolamine Butylbromide and its utility in easing acute cramping abdominal pain is clinically recognized and supported by pharmacological studies. The drug is prepared in various pharmaceutical preparations, including oral tablets and sterile solutions for injection administered via the intravenous or intramuscular routes.


Composition and Origin: Is Hyoscine Butylbromide Natural or Synthetic?

Hyoscine Butylbromide is a semisynthetic derivative of hyoscine (scopolamine), which is an alkaloid naturally sourced from belladonna plants. Chemically, it is classified as a quaternary ammonium compound, a distinct structural feature that is the basis of its function. This structure ensures the drug is a peripherally acting agent, as it significantly restricts the compound's passage across the blood-brain barrier. This design is critical, concentrating the drug's effects on the smooth muscle cells of the body's internal systems while minimizing potential central nervous system effects. The final product is a single-ingredient product, containing the active bromide salt along with necessary inactive excipients for its specific dosage form.


What is the Primary Benefit of this Antispasmodic?

The core benefit of the medication is the targeted relief of acute, visceral pain resulting from the overactivity of the involuntary smooth muscles, such as those in the gastrointestinal tract. The drug induces direct smooth muscle relaxation, which effectively resolves the underlying cramp. This targeted action reduces abnormal, powerful contractions known as peristalsis, providing a focused spasmolytic effect where the pain originates.

What side effects are possible with Hiocin?

Possible Side Effects and Safety Information

The safety profile of Hiocin (Hyoscine Butylbromide) is documented in regulatory sources based on the drug's action as a peripherally acting anticholinergic agent. Adverse reactions are formally classified by frequency and affected body systems, such as Gastrointestinal disorders and Eye disorders.


Frequency-Classified Adverse Reactions

The most commonly reported adverse reactions (classified as Common, affecting up to 1 in 10 people) typically relate to the anticholinergic properties and include dry mouth, constipation, tachycardia (increased heart rate), dizziness, and accommodation disorders (difficulty focusing).

Reactions classified as Uncommon (up to 1 in 100 people) include various skin reactions and hypersensitivity reactions. Urinary retention is listed as Rare.

Serious Adverse Reactions and Restrictions

Official prescribing information documents severe, potentially life-threatening events, including Anaphylactic shock and Anaphylactic reactions (classified as Not Known in frequency, reflecting post-marketing reports). Warnings are included regarding the potential for serious cardiovascular effects (like severe hypotension and tachycardia) when the injectable form is used in patients with underlying heart conditions.

Use of the medicine is formally restricted (Contraindicated) in conditions like narrow-angle glaucoma, myasthenia gravis, megacolon, and mechanical obstructions of the gastrointestinal tract. Regulatory notes indicate that older adults may have an increased susceptibility to anticholinergic effects such as urinary retention.

Overdose and Emergency Response

Overdose and when to seek help

Overdose of Hyoscine Butylbromide (Hiocin) is defined in regulatory labeling as an exaggeration of the drug’s anticholinergic effects, necessitating immediate medical evaluation.

Domain Official Regulatory Description
Documented Manifestations Symptoms include intensified anticholinergic effects such as tachycardia (fast heart rate), dry mouth, urinary retention, reddening of the skin, and transient visual disturbances.
Life-Threatening Outcomes The official labeling cites the potential for severe consequences, notably respiratory paralysis and cardiac arrest, primarily following massive overdose. CNS effects such as confusion, agitation, or coma have also been documented.
Immediate Actions Required Seek immediate medical attention for suspected overdose. Tell your doctor or medical staff immediately if an excessive amount has been administered, or if severe symptoms such as breathing difficulty or signs of anaphylaxis occur.

Official Management and Monitoring:

Treatment for overdose is specified as symptomatic and supportive. Specific procedures listed in official documents include gastric lavage and the use of activated charcoal for oral poisoning. Anticholinergic symptoms may respond to treatment with parasympathomimetics (such as physostigmine or pilocarpine). Catheterisation may be necessary to manage urinary retention, and intubation and artificial respiration should be considered for respiratory paralysis. Caution is advised for patients with pre-existing cardiac conditions due to the risk of increased heart rate.

Therapeutic Uses of Hiocin

Hiocin (hyoscine butylbromide) is considered relevant across therapeutic domains that involve specific muscular activity. Its use is applicable within clinical settings that involve acute or unstable symptom patterns related to the digestive and genito-urinary systems. The medication assists with symptoms related to physical discomfort and symptoms that interfere with daily functioning.

Hiocin is commonly used to help with symptoms related to physical discomfort during episodes of heightened symptoms, such as the painful abdominal cramps linked to conditions characterized by periods of heightened symptoms like irritable bowel syndrome (IBS). It may also assist with pain related to bladder cramps, biliary colic, and renal colic. The overall benefit helps ease the overall symptom burden and supports the patient during difficult episodes by easing distress. Hiocin is also applied in clinical settings that involve acute or unstable symptom patterns.


Quick Fact: Supports patients with symptoms related to physical discomfort

Eligibility and Restrictions for Use

Eligibility for Hiocin (Hyoscine Butylbromide)

This medication is not suitable for everyone. Official regulatory documents list several absolute prohibitions (contraindications) and populations requiring special consideration or monitoring.

Classification Populations and Conditions
Contraindicated (Use Prohibited) Hypersensitivity to the drug or its excipients; Myasthenia gravis; Narrow-angle glaucoma (untreated); Mechanical obstructions of the gastrointestinal (GI) tract; Paralytic or Obstructive ileus; Megacolon; Tachycardia or cardiac failure (especially for injection); Prostatic hypertrophy with urinary retention.
Restricted Use/Caution Cardiac conditions (e.g., coronary heart disease, cardiac arrhythmia) require caution and monitoring; Patients prone to urinary or intestinal obstructions; Patients with renal or hepatic impairment; Use for Intramuscular injection is prohibited in patients on anticoagulant drugs.

Oral tablets are generally not recommended for children under 6 years of age. Use during pregnancy and breastfeeding is also not recommended due to limited data, and it should only be given if clearly needed. Furthermore, oral formulations may be restricted for patients with certain hereditary sugar intolerances (e.g., fructose intolerance) due to the presence of excipients like sucrose or lactose.

What should I know about interactions with other medicines?

Hiocin Interactions with other medicines and products

Category Official Regulatory Documentation
Medicinal product categories with documented interactions: Anticholinergic agents (e.g., antidepressants, antihistamines), dopamine antagonists, beta-adrenergic agents, anticoagulant drugs, antacids, and adsorbent antidiarrheals.
Mechanistic basis of interactions (only if stated in label): Pharmacodynamic (additive or opposing effects), and Gastrointestinal Absorption Interference.
Timing-based interaction rules (if applicable): Must be separated by at least one hour from antacids or adsorbent antidiarrheals.
Interaction-related restrictions: Intramuscular (IM) injection is restricted for patients receiving anticoagulant drugs.

Interaction classifications (high-level)

Classification Type Official Regulatory Statement
Interaction severity classification (as defined in official documents): Contraindicated combinations (route-specific restriction), Clinically significant interactions (Pharmacodynamic and Absorption-based).
Interaction-context constraints (as defined in official documents): The contraindication applies only when the drug is administered via the intramuscular route.

Resulting interaction structure

Official interaction statements:

  • Co-administration with other anticholinergic agents (including tri- and tetracyclic antidepressants and antihistamines) may intensify the anticholinergic effect.
  • Concomitant use with dopamine antagonists (e.g., metoclopramide) may result in a diminution of the effects of both drugs on the gastrointestinal tract.
  • The tachycardic effects of beta-adrenergic agents may be enhanced.
  • Antacids or adsorbent antidiarrheals must be administered at least one hour after Hiocin to prevent the reduction of its absorption.
  • Hiocin is contraindicated for intramuscular injection in patients receiving anticoagulant drugs.

Connection to the overall interaction profile (2–4 sentences):

The regulatory interaction profile is defined by pharmacodynamic effects, leading to warnings about intensified effects with similar agents or diminished effects with motility agents. A critical label restriction prohibits intramuscular injection in the presence of anticoagulants due to bleeding risk. Official documentation mandates a timing-based rule to prevent absorption interference from antacids and antidiarrheals.

Mechanism of Action

How Hiocin Works: Mechanism of Action

Hiocin's action involves a molecular interaction within the autonomic nervous system that affects smooth muscle and glandular activity. The drug is classified as a competitive antagonist (blocker) of specific muscarinic acetylcholine receptors (mAChRs) in the periphery.

Blocking the Cholinergic Pathway

Hiocin binds to and blocks the M2 and M3 receptors, preventing the neurotransmitter acetylcholine (ACh) from initiating its signal. This direct suppression of cholinergic signaling is the first step in the mechanistic cascade that leads to the resulting physiological effects.

Modulating Visceral Muscle Tone

The blockade of M3 receptors on smooth muscle cells in the gut and urinary tract inhibits the intracellular signaling that normally triggers muscle contraction. This mechanism leads directly to the relaxation of visceral smooth muscles, which reduces the force and frequency of muscle contraction within these involuntary systems.

Reducing Exocrine Secretions

The mechanism also engages pathways regulating glandular function. The same M3 receptor antagonism causes a decrease in the secretion activity of exocrine glands, such as salivary and sweat glands. This effect is a physiological consequence of the drug's action on peripheral muscarinic receptors.

Dosage and Administration Information

How to Use Hiocin (Hyoscine Butylbromide)

This section outlines the standardized instructions for the correct administration of Hiocin (hyoscine butylbromide).

Oral Tablet Administration

Administration Scope Official Labeled Instruction
Route & Preparation Swallow the tablet whole with water. Do not break, crush, or chew it.
Timing The tablet may be taken with or without food.
Dosing for Adults/Adolescents The dose is typically 10 mg to 20 mg (one or two 10 mg tablets) per dose. The maximum daily dose should not exceed 60 mg to 80 mg, divided into 3 to 4 doses per day.
Dosing for Children (6–12 years) The dose is typically 10 mg per dose, with a maximum frequency of 3 times a day. The medicine is not recommended for children under 6 years.
Duration of Use Do not take Hiocin for a prolonged period (more than a few days) on a continuous daily basis without investigating the cause of the pain with a healthcare professional.
Missed Dose If a dose is forgotten, take it as soon as you remember. If it is almost time for your next scheduled dose, skip the missed dose and continue with the regular schedule. Do not take a double dose to make up for a forgotten one.

Recent Clinical Evidence

Evidence for Acute Visceral Spasm and Colicky Pain

The research consists of controlled studies and randomized trials. These studies examined short-term or episodic symptom patterns, such as episodes of abdominal pain (colic) studied in research. Research was conducted mainly in adult populations presenting to acute care settings.

The primary focus of this research was to examine outcomes related to physical discomfort. Researchers used standardized tools to monitor the intensity of patient-reported discomfort. They also looked at the time intervals during which changes in pain measurements were observed after administration. Findings describe patterns observed in the studies where an association was noted between administration and differences in short-term pain score measurements compared to baseline.

What remains uncertain is the durability of these observations. Because the studies were conducted during periods of increased symptom activity, the follow-up durations were limited to the immediate hours following a single dose. Therefore, long-term patterns regarding the recurrence of symptoms are not fully established. Research examined comparative outcomes against certain other treatments, and findings varied across studies.


Evidence for Irritable Bowel Syndrome (IBS) and Functional Cramping

Research explored the evaluation of Hiocin in conditions characterized by fluctuating or episodic manifestations, specifically pain and cramping associated with Irritable Bowel Syndrome (IBS). These studies examined how symptoms evolved in the observed populations over defined time intervals, typically ranging from three to six weeks.

The outcomes that were measured were largely patient-reported experiences, focusing on perceived discomfort and changes in the frequency or intensity of cramping episodes. Studies report how symptoms evolved in the observed populations, and findings describe patterns where, in some intermediate-term trials, a larger proportion of individuals reported changes in their symptoms compared to those in placebo groups.

However, the certainty remains low regarding sustained relief. Since the follow-up durations were limited, there is limited information for long-term outcomes (beyond six weeks). Furthermore, reviews of the literature have noted that the evidence quality varies across studies, with many of the contributing trials being older, which introduces methodological considerations for the current research context.

Key Studies & References

  1. Public Assessment Report of the reclassification of Buscopan IBS Relief, Hyoscine Butylbromide 10mg tablets (UK Regulatory Review of Safety and Pack Size)

Frequently Asked Questions (FAQ)

Common questions about Hiocin (FAQ)


Q: Can Hiocin be taken by children or adolescents?

Official product information states that Hiocin tablets are typically not recommended for children under 6 years old. Specific dosing guidelines are provided for children aged 6 to 12. Regulatory information indicates that the adult dosing range is generally applied to adolescents over 12 years old.


Q: Are there any known issues with taking Hiocin while pregnant?

According to the official regulatory documents, the use of Hiocin is not recommended during pregnancy. This position is taken because regulatory documents note that human data regarding the drug's effects during pregnancy are limited or insufficient.


Q: Is Hiocin generally safe to use during breastfeeding?

Official product information advises against the use of Hiocin while breastfeeding. This is because there is insufficient information available regarding whether the active ingredient passes into human breast milk.


Q: Are there specific foods or drinks that should be avoided while using Hiocin?

Regulatory warnings indicate that using Hiocin concurrently with alcohol may increase the risk of drowsiness or intensify anticholinergic effects. Also, the label instructs that medicines like antacids or certain antidiarrheals must be taken at least one hour after Hiocin to avoid reducing its absorption. No specific foods are generally listed for avoidance.


Q: Can Hiocin interact with common over-the-counter pain relievers?

Regulatory warnings note that Hiocin can interact with other medicines that have an anticholinergic effect, such as certain cold and flu medications. The labeling advises that combining Hiocin with these types of medicines carries a risk of intensified side effects. Common pain relievers like paracetamol or ibuprofen are generally not listed as primary interactors, but reviewing all active ingredients is generally recommended.


Q: Is there a risk of interaction between Hiocin and herbal supplements?

Official regulatory documents primarily list interactions with other pharmaceutical products. Caution is generally advised regarding any herbal product that may possess anticholinergic or sedating properties, due to the theoretical risk of intensified effects.


Q: Do older adults (seniors) need to take Hiocin differently?

The official dosing instructions do not typically mandate a specific dose adjustment for older adults. However, regulatory warnings indicate that older individuals may be more susceptible to the drug’s anticholinergic side effects, such as dizziness or difficulty urinating (urinary retention).


Q: Can Hiocin affect my ability to drive or operate machinery?

Official documents caution that side effects like dizziness or accommodation disorders (difficulty with eye focus) may occur. The official warning advises that if these side effects occur, a person's ability to drive or operate machinery may be impaired.


Q: What are the ingredients in Hiocin other than the active one?

Regulatory documents list the active ingredient, Hyoscine Butylbromide, as well as the inactive ingredients, known as excipients. Official warnings often highlight the presence of substances like lactose or sucrose for patients with known hereditary sugar intolerances.


Q: Can someone with kidney issues use Hiocin?

Official regulatory information states that the use of Hiocin requires caution in patients with renal (kidney) impairment. This is because the kidneys play a role in eliminating the medication from the body, and use in this population may necessitate medical monitoring.


Q: Are patients with liver conditions generally restricted from using Hiocin?

According to official documents, use in patients with hepatic (liver) impairment requires caution, as the liver is involved in the drug's elimination process. Medical monitoring may be necessary in these cases.


Q: Is there a risk of an allergic reaction to Hiocin?

Yes, official documents list hypersensitivity (allergy) to the active ingredient as a formal restriction for use. Serious reactions, including anaphylactic shock (a severe, life-threatening allergic reaction), have been documented in post-marketing reports.


Q: What are the signs of taking too much Hiocin?

The symptoms of taking too much Hiocin are typically described as an exaggeration of its expected effects, known as exaggerated anticholinergic effects. These can include severe dry mouth, vision problems, a very fast heart rate (tachycardia), and potential effects on the nervous system such as confusion.


Q: Is Hiocin the same type of medicine as [similar common drug name]?

Hiocin is chemically classified as a peripherally acting antispasmodic and anticholinergic agent. This means it works by blocking specific receptors to relax the smooth muscles in the gut and urinary tract. This classification is shared by other medicines that target involuntary muscle spasms.


Q: How quickly does Hiocin typically start to work?

According to pharmacokinetic data in official documents, the onset of action is typically described as rapid. For the oral tablet form, effects are often observed starting within approximately 15 minutes of administration.


Q: What is the expected time frame for the effects of Hiocin to last?

The drug's effects are generally described in regulatory information as being short-acting. For the oral tablet, the expected therapeutic effects typically last for a duration of approximately 4 to 6 hours.


Q: Does Hiocin cause long-term side effects?

Official regulatory information primarily addresses side effects observed during acute (short-term) use because the drug is intended for brief periods. Long-term safety data is more limited. However, warnings do indicate that anticholinergic effects may be more evident in certain populations, such as older adults.


Q: Is it common to feel tired after taking Hiocin?

Official regulatory documents list dizziness as a common side effect of Hiocin. However, fatigue or simple tiredness is not typically listed among the common or uncommon reported adverse reactions.


Q: What is the official definition of the condition Hiocin is intended to treat?

Regulatory documents officially indicate Hiocin for the relief of acute spasm or sudden, severe cramping pain known as colicky pain. This is typically associated with conditions affecting the gastrointestinal tract, such as Irritable Bowel Syndrome (IBS), or the genitourinary tract.


Q: Is Hiocin a controlled substance or habit-forming?

Official regulatory classifications confirm that the active ingredient in Hiocin, Hyoscine Butylbromide, is not designated as a controlled substance. Furthermore, the medicine has no known risk of being habit-forming or leading to dependence.


Q: What kind of studies support the use of Hiocin?

The research supporting the use of Hiocin consists of controlled human studies, including randomized controlled trials. These studies primarily examine the effects of the medication on short-term symptom relief, such as reducing the intensity of pain episodes.


Q: What should I do if I experience an unexpected reaction to Hiocin?

Official documents advise that for any signs of a serious reaction, the medication should be discontinued immediately and emergency medical attention should be sought. For all other unexpected effects, patient guidelines recommend reporting them to a healthcare professional.


Q: Is it possible for Hiocin to stop working over time?

Official product information does not address the development of drug tolerance (when a drug stops working effectively over time). Instead, the primary caution is against taking the medicine for a prolonged period without a healthcare professional first investigating the underlying cause of the pain.


Q: Does Hiocin have a black box warning?

According to the official US regulatory labeling, Hiocin (Hyoscine Butylbromide) does not have a Black Box Warning (the most serious type of warning required by the FDA).


Q: How does the use of alcohol affect Hiocin?

Official warnings caution against combining Hiocin with alcohol. This combination carries a risk of enhanced drowsiness or an increase in the medicine's anticholinergic effects, which can include dry mouth and blurred vision.


Q: Are there any known interactions between Hiocin and caffeine?

Regulatory documents generally do not list any specific, clinically significant interaction between the use of Hiocin and the consumption of caffeine.


Q: Does body weight influence how Hiocin affects a person?

Official dosing instructions for adults and children over the age of six are provided as fixed ranges. The standard dose of Hiocin is not based on body weight.


Q: How long can a person usually stay on Hiocin treatment?

Official product instructions strongly caution against taking the medicine for a prolonged period—defined as more than a few days continuously—without consulting a healthcare professional. The regulatory document states that the cause of the pain should be investigated by a healthcare professional.


Q: Are there any specific organs that Hiocin affects the most?

The drug's effects are primarily concentrated on the smooth muscles and glands within the body's internal systems. This includes the muscles of the gastrointestinal tract (stomach and bowels) and the genitourinary tract.


Q: Is it normal to have a slight change in appetite when starting Hiocin?

Official regulatory documents generally classify the side effects of Hiocin by frequency. A change in appetite is not typically listed among the common or uncommon reported adverse reactions.


Q: Does Hiocin work for all types of [condition category]?

Hiocin is officially indicated for acute pain caused by visceral spasms (cramping of internal organs). While it is used for conditions like IBS, regulatory evidence reviews have noted that the findings and reported efficacy vary across different studies.


Q: Can Hiocin be taken with cold and flu medications?

Caution is advised when combining Hiocin with cold and flu medications. Many of these products contain ingredients, such as certain antihistamines, that are also anticholinergic agents. Taking them together could intensify the side effects of Hiocin.


Q: What is the difference between Hiocin and its generic form?

Hiocin is the brand name for the medicine. The generic form contains the identical active ingredient, Hyoscine Butylbromide, at the same strength. The main differences are typically in the inactive ingredients (excipients) used in the tablet formulation and the cost.


Q: Why is Hiocin sometimes given in combination with other medicines?

Official documents do not explain the clinical rationale for combining Hiocin with other medicines. Instead, they provide warnings on known interactions, such as combining it with other drugs that could lead to intensified side effects or cause a diminution (reduction) of the effects of either medicine on the gastrointestinal tract.


Q: Does Hiocin require any special monitoring or regular testing?

Routine monitoring or regular testing is not typically required for general use of Hiocin. However, the regulatory label advises that patients with pre-existing conditions, such as cardiac, renal (kidney), or hepatic (liver) issues, should use the medication with caution and may require medical monitoring.


Q: Does Hiocin cause weight gain or weight loss?

Official regulatory documents generally classify the side effects of Hiocin by frequency. Changes in body weight are not listed among the common or uncommon reported adverse reactions.


Q: What is the mechanism by which Hiocin is eliminated from the body?

Pharmacokinetic data confirms that the drug is eliminated from the body through a combination of fecal and renal (kidney) excretion. It leaves the body as both the unchanged active substance and its metabolites (breakdown products).


Q: Does Hiocin interact with birth control pills?

Official regulatory documents generally do not document a clinically significant interaction between the use of Hiocin and oral contraceptive (birth control) pills.


Q: Can Hiocin cause mental or mood changes?

Hiocin is chemically designed to be peripherally acting, meaning its effects are concentrated outside the brain to minimize central nervous system (CNS) effects. The risk of serious mental or mood changes is generally low, though confusion may occur in rare instances or in cases of overdose.


Q: Are there any patient registries or long-term safety data available for Hiocin?

Official evidence reviews indicate that the follow-up duration in clinical trials was limited. Therefore, safety data is continuously gathered after approval through post-marketing surveillance systems that monitor reports of adverse events.


Q: Why do official documents caution against sudden discontinuation of Hiocin?

Official documents do not contain a caution against sudden discontinuation due to a risk of withdrawal. The primary warning advises users not to stop taking the medicine without first having a healthcare professional investigate the underlying cause of the pain or symptoms.


Q: Is it necessary to have a prescription to get Hiocin?

The requirement for a prescription for Hiocin varies widely by country and the specific strength or formulation (tablet vs. injection). In some regions, it may be available over-the-counter (OTC) for certain uses, while in others, it is strictly prescription-only (Rx).

How should Hiocin be stored and disposed of?

How to Store and Dispose of Hiocin?

Proper storage and disposal of Hiocin (hyoscine butylbromide) are essential to maintain its efficacy and ensure safety. Hiocin tablets should generally be stored at room temperature, typically between 15 C and 30 C (59 F and 86 F), or according to the specific manufacturer's instructions. Keep the medication in its original container, sealed tightly, and away from direct light, heat, or moisture. It is crucial to store all forms of this medication out of the sight and reach of children.

For Hiocin injection solutions, storage guidelines may vary; some formulations do not require special conditions, while others may need to be kept below 25 C or 30 C, protected from light. Once an ampoule is opened or if the solution is diluted, it should generally be used immediately, or according to specific stability data, to minimize contamination risk.

Do not dispose of any unwanted or expired medication, including Hiocin, in household waste or down a sink or toilet. Consult your pharmacist or local waste disposal service for guidance on the proper and safe method for discarding unused medicine, which helps to protect the environment.

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

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