Anaspan

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Medically reviewed

Laura Arias

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 Anaspan

What is Anaspan?

Anaspan is a medication that belongs to the class of drugs known as anticholinergics. It is primarily used to manage symptoms associated with various gastrointestinal disorders and other conditions characterized by smooth muscle spasms.

How it Works

The active component in Anaspan works by blocking the action of acetylcholine, a chemical messenger in the body that signals muscles to contract. By inhibiting this neurotransmitter, the medication helps to relax smooth muscles, particularly in the digestive tract. This relaxation can help reduce cramping, spasms, and excessive secretion of stomach acid.

Common Applications

Anaspan is frequently utilized in the management of functional bowel disorders. Its ability to reduce muscle contractions makes it a therapeutic option for several conditions, including:

  • Irritable Bowel Syndrome (IBS): To alleviate abdominal pain and cramping.
  • Peptic Ulcers: As an adjunctive therapy to help control gastric acid secretion.
  • Acute Enterocolitis: To manage symptoms of inflammation and hypermotility in the intestines.
  • Other Spastic Conditions: It may also be used to treat spasms of the bladder or biliary tract.

By addressing the underlying muscle hyperactivity, Anaspan aims to improve comfort and stabilize digestive function for patients experiencing these symptoms.

What side effects are possible with Anaspan?

The safety profile of Hyoscine Butylbromide (Anaspan) is formally characterized by effects consistent with its action as a peripheral anticholinergic agent, as documented in official regulatory labeling (e.g., EMA SmPC, FDA DailyMed). Adverse reactions are classified according to the physiological system affected and their reported incidence.

Officially Documented Adverse Reactions

The most frequently reported effects are categorized as Common (1/100 to < 1/10) and include dry mouth and dyshidrosis (abnormal sweating). Reactions classified as Uncommon include tachycardia (increased heart rate) and various skin reactions.

Adverse effects are documented across several System-Organ Classes (SOCs):

System-Organ Class Associated Effect Frequency Classification
Eye Disorders Mydriasis, Accommodation disturbances Uncommon
Cardiac Disorders Tachycardia Uncommon
Renal and Urinary Disorders Urinary retention Rare
Immune System Disorders Anaphylactic reactions/shock Very Rare

Serious Safety Considerations and Restrictions

Official documents highlight the risk of Acute Angle-Closure Glaucoma (Not Known frequency) and severe, life-threatening Anaphylactic Shock (Very Rare), which is noted particularly with the injectable formulation.

Safety constraints and contraindications strictly define patient populations who must not use the medicine. It is restricted for use in patients with untreated narrow angle glaucoma and conditions that increase the risk of urinary complications, such as prostatic hypertrophy with urinary retention. Furthermore, it is contraindicated in cases of obstructive ileus or other mechanical obstructions of the gastrointestinal tract. Specific safety notes also apply to the elderly due to their increased sensitivity to peripheral anticholinergic effects.

Overdose and Emergency Response

The official regulatory profile for an overdose of Anaspan (Hyoscine Butylbromide) is defined by the manifestation of severe anticholinergic symptoms. Documented presentations include signs such as urinary retention, dry mouth, tachycardia (increased heart rate), reddening of the skin, and transient visual disturbances. Severe intoxication and toxic doses are associated with life-threatening outcomes, including respiratory paralysis, depression of the central nervous system, and circulatory failure. Patients with impaired liver or kidney function may be more susceptible to adverse central nervous system effects.

Immediate medical advice should be sought for any suspected overdosage. Regulators explicitly mandate contacting emergency services if severe, unexplained abdominal pain persists, or if pain occurs alongside symptoms such as fever, nausea, vomiting, decreased blood pressure, or blood in the stool. Additionally, urgent ophthalmological advice must be sought immediately if a painful, red eye with loss of vision develops.

The officially described management is symptomatic and supportive. Regulatory documentation states that overdosage effects respond to agents classified as parasympathomimetics. Specific procedural steps for oral poisoning include gastric lavage and the administration of activated charcoal.

Therapeutic Uses of Anaspan

Anaspan is indicated for the short-term management of acute discomfort and pain associated with specific inflammatory conditions. This medication is used to help manage symptoms across common clinical scenarios, including mild-to-moderate musculoskeletal pain, discomfort that may occur following minor procedures, and pain related to acute inflammation in affected joints or tissues.

It is an option to support patient comfort by modulating processes associated with pain sensation, which may help patients maintain their physical function and continue with their prescribed daily routines.

“The purpose of this medication is to support a manageable reduction in symptom intensity.”

Quick Fact: Relief for Acute Pain

Eligibility and Restrictions for Use

The official eligibility profile for Anaspan (Hyoscine Butylbromide) is strictly defined by regulatory authorities based on contraindications and patient status.

Populations for Whom Use is Contraindicated

Anaspan must not be used by patients with:

  • Myasthenia Gravis, Untreated Narrow-Angle Glaucoma, or known Hypersensitivity to the drug or excipients.
  • Mechanical Stenosis, Paralytic/Obstructive Ileus, or Megacolon in the gastrointestinal tract.
  • Prostatic Hypertrophy with urinary retention or obstructive uropathy.
  • Tachycardia, Angina, or Cardiac Failure (specifically for the injectable form).

Restricted and Special Populations

  • Pregnancy and Lactation: Use is Not Recommended as a precautionary measure due to limited or insufficient human data.
  • Age: The medicine is generally Not Recommended for children under 6 years of age in tablet form. Use in adults is standard.
  • Conditional Restrictions: Use requires Caution in patients with pre-existing cardiac conditions or in those susceptible to intestinal or urinary outlet obstructions.
  • Anticoagulant Therapy: The Intramuscular (IM) injection route is Contraindicated for patients receiving anticoagulant drugs.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Interaction Scope

Detail Entity / Pattern
Medicinal product categories with documented interactions Anticholinergic Agents, Beta-adrenergic Agents, Dopamine Antagonists, Anticoagulant Drugs, Antacids, Adsorbent Antidiarrheals.
Mechanistic basis of interactions (only if stated in label) Pharmacodynamic (Additive/Counteracting Effects); Pharmacokinetic (Altered absorption/gastric emptying).
Population-specific interaction notes (if applicable) The elderly may be more sensitive to the central anticholinergic effects when co-administered with other anticholinergic agents.
Interaction-related restrictions Intramuscular injection is prohibited when co-administering Anticoagulant Drugs.

Interaction Classifications (High-Level)

Classification Description
Interaction severity classification (as defined in official documents) Contraindicated Combination (Intramuscular route with anticoagulants); Clinically Significant Interaction (Pharmacodynamic and exposure-altering effects).

Resulting Interaction Structure

Official interaction statements:

  • Co-administration with other anticholinergic agents (including certain antidepressants and antihistamines) may intensify the anticholinergic effect.
  • The tachycardic effects of beta-adrenergic agents may be enhanced.
  • Dopamine antagonists (such as metoclopramide) may result in a diminution of effects on the gastrointestinal tract due to opposing actions.
  • Antacids or adsorbent antidiarrheals can decrease the absorption of Hyoscine Butylbromide, which may reduce its systemic exposure.
  • Hyoscine Butylbromide may affect the absorption and delay the gastric emptying of other orally administered drugs.
  • The intramuscular route of administration is contraindicated in patients receiving anticoagulant drugs due to the officially documented risk of intramuscular haematoma.

Connection to the overall interaction profile:

Regulatory documents define the product's interaction structure through two domains: pharmacodynamic reinforcement with co-administered anticholinergic or chronotropic agents, and pharmacokinetic alterations affecting systemic exposure. This framework also includes a mandatory procedural constraint prohibiting a specific route of administration when the patient is concurrently taking anticoagulant medication.

Mechanism of Action

Irreversible Inhibition of Prostaglandin Synthesis

The mechanism of Aspirin involves the permanent blockade of the Cyclooxygenase (COX) enzymes (COX-1 and COX-2) via irreversible acetylation. This action prevents the conversion of arachidonic acid into pro-inflammatory prostaglandins and thromboxane A2. The consequence of this inhibition is the reduction of local sensitization of nociceptors and the modulation of the hypothalamic temperature set-point, resulting in analgesia (reduced pain signaling) and antipyresis (modulation of the hypothalamic temperature set-point).


Central Neuromodulation and Mechanistic Synergy

The secondary agent, Caffeine, functions as a competitive antagonist at adenosine receptors (primarily A1 and A2A) in the Central Nervous System (CNS) and on vascular tissue. This antagonism leads to increased neural excitability and cranial vasoconstriction (narrowing of blood vessels in the brain). This mechanism supports the overall effect profile by contributing to increased neural excitability and providing a distinct, complementary mechanism of vasoconstriction. The combination allows for simultaneous modulation of both chemical and vascular signaling pathways, which influences the physiological response to dysregulated signaling.

Dosage and Administration Information

How to Use Anaspan: Administration Guidelines

Administration of Anaspan (Hyoscine Butylbromide) follows distinct protocols for its two primary dosage forms. This medication is designated for short-term management; continuous daily or extended use is restricted and requires further medical investigation of the underlying cause of spasm.


Administration Scope and Dosing

The standard approach to using Hyoscine Butylbromide involves either the oral tablet or the solution for injection. The approved routes of administration include Oral (tablets), Intravenous (IV) injection, Intramuscular (IM) injection, or Subcutaneous (SC) injection.

Element Instructions
Dosing Schedule (Adult) Oral: 10 mg to 20 mg per dose. Parenteral: Initial dose of 20 mg, with an option to repeat after 30 minutes. The maximum daily dose is 100 mg.
Frequency Pattern Oral: Typically 3 to 5 times daily. Parenteral: Administered as needed for acute episodes, not for routine daily use.
Timing in relation to meals May be taken regardless of food intake.

Procedural and Population-Specific Rules

Age-Group Administration Rules: For children aged 6 to 12 years, the oral dose is 10 mg up to three times daily. The use of oral tablets is not recommended for children under 6 years.

Special Procedural Conditions: Oral tablets must be swallowed whole with adequate water. If administered intravenously, the injection must be given slowly, over a minimum duration of 3 minutes. Patients receiving anticoagulant therapy should utilize the IV or SC routes, as IM injection is avoided due to the risk of hematoma.


Connection to the overall use protocol: These instructions define a protocol where the oral form supports frequent, non-acute use, while the parenteral routes are reserved for rapid intervention in acute episodes, all within strict dosing limits to ensure proper use.

Recent Clinical Evidence

Research evidence / Overview of Studies for Anaspan (Hyoscine Butylbromide)


Evidence for Abdominal Cramping and General GI Spasm

Research was conducted using short-term randomized controlled trials (RCTs) and systematic reviews, where adult and adolescent populations were studied for outcomes related to physical discomfort from abdominal cramping. Studies monitored patient-reported outcomes describing perceived discomfort and the time required for patients to report a change in pain intensity. Research was applied in study contexts involving conditions characterized by fluctuating or episodic manifestations.

Findings describe patterns observed in the studies related to a measured change in patient-reported pain intensity during defined time intervals, particularly in acute spasm. Some studies monitored outcomes where the measured symptom change in the studied group was observed as comparable to a separate control group. However, research exploring short-term symptom changes in specific, acute diagnoses—such as abdominal pain linked to acute gastroenteritis—has reported mixed findings.


Research for Facilitating Diagnostic and Therapeutic Procedures

Research examined the medicine's role in influencing smooth muscle contraction and movement during complex medical imaging and endoscopic procedures (such as colonoscopy and ERCP). Studies primarily focused on measuring the reduction in muscle motility during the procedure and procedural metrics.

Procedural reports noted that the administration of the drug was associated with decreased muscle contraction, which facilitated the technical execution of the examination. Studies monitored outcomes related to the visual quality of the internal lining of the organs. However, research examined whether the drug was associated with changes in the rate of detection of small mucosal abnormalities during diagnostic colonoscopy, and findings were mixed across various trials.


Studies on Genitourinary Tract Spasm and Colic

Research has explored the drug's use in patients presenting with acute pain from spasms in the renal and biliary tracts, which are conditions involving periods of heightened symptoms. Studies monitored patient-reported outcomes describing perceived discomfort, focusing on the change in acute pain levels within short observation periods following administration via injection. Comparative studies involving this condition explored whether the measured outcomes were similar to those observed with separate pain management strategies, and findings were mixed.


What the Research Landscape Shows: Consistency and Gaps

The body of evidence is most frequently derived from study contexts involving abdominal cramping characterized by fluctuating or episodic manifestations. However, consistency of findings varies across studies, especially when the drug is studied for pain relief in specific acute inflammatory conditions. Gaps exist primarily because follow-up durations were limited, and comparative evidence against a wide range of newer pharmacological agents is lacking in certain contexts. Research highlights what is known—and what is still uncertain.

Frequently Asked Questions (FAQ)

Common questions about Anaspan (FAQ)

Q: Do I need to avoid any specific foods or drinks while using Anaspan?

According to official regulatory documents, this medicine can generally be taken regardless of food intake. Specific food or drink interactions are not typically established in the official product information.

Q: Is Anaspan a medicine that I would take for a long time?

Official guidelines describe this medicine as being designated for short-term management of symptoms. Continuous daily use or use for extended periods is generally restricted and requires further medical investigation into the underlying cause of the symptoms.

Q: What is the typical duration of action for Anaspan?

Official information indicates that the therapeutic effect of the medicine generally lasts for approximately 4 to 6 hours. This duration of effect is one factor considered when establishing the typical dosing frequency described in regulatory documents.

Q: Is it okay to take Anaspan with vitamins or supplements?

Official information indicates that there is generally not enough data available to determine the specific interaction effects of co-administering the medicine with general vitamins and nutritional supplements. Reviewing all co-administered products with a healthcare professional is consistent with patient safety practices.

Q: Can Anaspan interact with herbal supplements like St. John's Wort?

Official regulatory documents typically note that herbal remedies are often not tested for their interaction effects in the same way as prescription or pharmacy medicines. Therefore, specific data on interactions with herbal supplements is not usually available in official product information.

Q: Are there any restrictions on driving or operating machinery while taking Anaspan?

Official patient information contains warnings about the possibility of certain effects like blurred vision or temporary visual accommodation (focusing) impairment. Official documentation notes that caution is warranted regarding driving or operating machinery when experiencing these effects.

Q: What should I do if I think I am having an interaction with Anaspan?

Patient information commonly describes the practice of seeking advice from a healthcare professional or pharmacist if a person suspects an interaction or experiences new symptoms. This practice is also described if the underlying condition does not improve after using the medicine as indicated.

Q: What groups of people are listed as generally unable to use Anaspan?

Official regulatory documents define a number of contraindications, or situations where the medicine must not be used. These conditions include, but are not limited to, myasthenia gravis, untreated narrow-angle glaucoma, and mechanical obstructions in the gastrointestinal or urinary tracts, as described in official labeling.

Q: Why does Anaspan sometimes need to be taken with food?

Official guidelines state the medicine can be taken regardless of food intake for maximum flexibility. However, some regulatory documents mention that taking it with food may be an approach used if a patient experiences stomach upset.

Q: Is Anaspan used for both acute and chronic conditions?

Regulatory documentation indicates the medicine is officially designated for short-term management and is administered for acute episodes of muscle spasm. Continuous daily use associated with chronic management is generally restricted.

Q: Why do people say Anaspan is used for more than one thing?

Official documentation describes the medicine's purpose as the relief of smooth muscle spasm in multiple areas of the body. Since the spasm can occur across the gastrointestinal, genitourinary, and biliary tracts, this accounts for its varied use in clinical practice.

Q: What is the chemical or scientific name for Anaspan?

The active ingredient in the medicine is chemically known as Hyoscine Butylbromide (INN). This active substance is also sometimes referred to as scopolamine butylbromide.

Q: What is the general patient expectation for improvement while using Anaspan?

Clinical studies examine patient-reported outcomes related to perceived discomfort and the time required for a patient to report a change in pain intensity during acute spasm episodes. The medicine is studied to manage the pain or discomfort caused by these spasms.

Q: Does Anaspan affect mental clarity or memory?

Official information indicates the chemical structure of the active ingredient restricts its ability to pass the blood-brain barrier. This design is intended to minimize central nervous system effects, such as those related to mental clarity or memory.

Q: What are the limitations of the current research on Anaspan?

Regulatory summaries of research note certain limitations in the available studies. These include limited follow-up durations in the trials and a lack of comparative evidence against some newer medicines in specific therapeutic contexts.

Q: How can I find the official prescribing information for Anaspan?

Official product information can be found in documents such as the Summary of Product Characteristics (SmPC) issued by the regulatory authority in your region. It is also available in the full Prescribing Information (PI) document provided by the manufacturer.

Q: Is Anaspan known to interact with birth control pills?

Current regulatory guidelines and official documents, including those that govern drug interactions, do not typically list an interaction between this medicine and oral contraceptive pills (birth control pills).

Q: What are the known potential benefits of Anaspan?

The documented benefits are related to the relief of visceral smooth muscle spasm and its secondary use in medical procedures. In procedures, the medicine is used to reduce muscle motility (movement), which can facilitate diagnostic execution.

Q: Are there any major drug classes that should be described when considering Anaspan?

Regulatory documents classify this medicine as a peripheral antispasmodic and an anticholinergic drug. The official product information details its actions and documented interactions with other medicines in these related classes.

Q: If a person has severe heart disease, can they still be considered for Anaspan?

The injectable form of the medicine is restricted for use in patients with underlying cardiac conditions such as tachycardia, angina, or cardiac failure. Specific warnings have been issued concerning the risk of serious adverse effects in patients with pre-existing heart disease.

Q: Does Anaspan have a risk of dependence or misuse?

Regulatory bodies have issued warnings to healthcare professionals regarding the potential for misuse. These warnings note reports of unauthorized use methods that may generate other compounds.

Q: What is the purpose of the 'black box warning' for Anaspan, if there is one?

Official prescribing documents do not contain an FDA-style 'Black Box Warning' (the highest-level safety alert). However, regulatory authorities have issued specific Drug Safety Updates concerning the risk of serious adverse effects in patients with underlying cardiac disease.

Q: Is the research evidence for Anaspan based on human trials?

The body of evidence supporting the medicine includes data gathered from human research. This evidence is derived from sources such as short-term randomized controlled trials (RCTs) and studies monitoring patient-reported outcomes.

How should Anaspan be stored and disposed of?

Storage and Disposal Requirements for Anaspan (Hyoscine Butylbromide)

The storage and handling of Anaspan must strictly adhere to the conditions documented in official regulatory labeling to maintain the product's quality and safety.

Mandatory Storage Conditions

The product must be stored below 25 C and protected from moisture and light. This requires the tablets to be kept in the original container or blister pack until the time of use. The injectable solution, if opened or diluted, must be used immediately or promptly discarded.

All forms of this medication must be stored out of the sight and reach of children.

Official Disposal Instructions

Unused, expired, or remaining Anaspan must not be disposed of in household waste or wastewater (e.g., toilet or sink). Disposal must follow specific local regulatory guidelines and protocols for pharmaceutical waste, as advised by a pharmacist or local waste authority.

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

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