Egazil

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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.

Overview of Egazil

Property Description
Active Ingredient Hyoscyamine Sulfate
Form Oral Tablet, Capsule, Liquid, Injection
Pharmacological Class Anticholinergic, Antispasmodic
Common Use Relief of smooth muscle spasms and hyperactivity
Origin Derived Tropane Alkaloid

What Type of Medicine is Egazil?

Egazil is classified as a potent anticholinergic agent and an effective antispasmodic medication, with its core identity rooted in the single active ingredient, Hyoscyamine Sulfate. This classification places it in the parasympatholytic class because it directly works against the signals of the parasympathetic nervous system, specifically operating as a competitive muscarinic antagonist.

Composition, Origin, and Available Forms

The key substance, Hyoscyamine Sulfate, is a highly purified, semi-synthetic compound that is structurally the levorotary isomer of atropine, derived from tropane alkaloids found in plants like Atropa belladonna. As a single-ingredient product, Egazil is manufactured in multiple dosage forms, including standard and sublingual oral tablets, extended-release capsules for sustained action, oral liquids, and injection solutions. These varied forms, which utilize either a solid oral matrix or an aqueous solution as a base, are clinically recognized for providing flexible dosing options, addressing immediate or sustained relief needs.

General Purpose and Primary Benefit

The general purpose of Egazil is to reduce discomfort and pain arising from the hyperactivity of the body’s involuntary systems. Its antispasmodic property is specifically noted for helping with typical spasms, such as those occurring in cases of renal colic or irritable bowel syndrome, by relaxing the smooth muscles of the gastrointestinal tract and other internal organs, relieving painful, sudden cramping. These anticholinergic properties include the ability to significantly decrease gut motility.

What side effects are possible with Egazil?

Possible side effects and safety information

The official safety profile for the combination product containing Diphenoxylate Hydrochloride and Atropine Sulfate (Egazil) documents adverse reactions primarily across several System-Organ Classes. Regulatory labeling does not utilize standard frequency categories (e.g., common, rare) but lists potential effects based on reported data.


Documented Adverse Reactions and Organ Systems

Adverse reactions listed in the prescribing information include effects on the Nervous System, such as sedation, dizziness, headache, and confusion. Gastrointestinal effects, including nausea, vomiting, and abdominal discomfort, are also documented. Due to the Atropine component, anticholinergic effects, such as dryness of mucous membranes, are potential systemic reactions. Allergic manifestations like rash, pruritus, and rarely, angioneurotic edema are also officially recognized.


Serious Adverse Reactions and Safety Constraints

Regulatory documents highlight the potential for severe adverse reactions. These include Severe Respiratory Depression and Coma, particularly following overdose, where symptoms may be significantly delayed. Toxic Megacolon and Paralytic Ileus are documented as serious risks, especially in patients with acute ulcerative colitis. The most stringent safety constraint is the absolute contraindication for use in children under 6 years of age due to the risk of severe CNS toxicity. Additionally, caution is mandated for patients with advanced hepatorenal disease, as use may precipitate hepatic coma. The product is also designated a Controlled Substance.


This structure defines the official safety boundaries by separating generally expected effects from life-threatening risks, ensuring specific warnings and population constraints are clearly communicated as mandated by health authorities.

Overdose and Emergency Response

Overdose and when to seek help

Suspected overdose of Egazil requires immediate medical attention and contact with a poison control center or hospital emergency department due to the risk of severe, life-threatening outcomes. The overdose profile reflects a dual toxicity, presenting combined signs of central nervous system (CNS) depression (e.g., severe drowsiness, lethargy, pinpoint pupils or miosis) from the diphenoxylate component, and anticholinergic poisoning (e.g., tachycardia, flushing, and dryness of the skin and mucous membranes) from the atropine component.

A critical risk documented in regulatory information is delayed respiratory depression, which may not be evident until 12 to 30 hours following ingestion and can progress to a fatal outcome. Therefore, all suspected overdose cases mandate prolonged and careful monitoring, requiring observation for a period of at least 48 hours, preferably under continuous hospital care.

Emergency management procedures officially described include administering Naloxone hydrochloride to counteract severe respiratory distress and using gastric lavage or activated charcoal for decontamination. Regulatory warnings also note the increased risk of severe CNS and respiratory depression in children under 6 years of age, leading to the product's official contraindication in this population.

Therapeutic Uses of Egazil

Egazil (diphenoxylate hydrochloride with atropine sulfate) is primarily specified as an adjunctive therapy intended for the symptomatic management of diarrhea. Its therapeutic aim is to assist in the mitigation of discomfort and inconvenience associated with symptoms of increased bowel motility.

As a combination product, this medicine is specified for use in patients to help control the symptoms of diarrhea. This includes assistance in reducing the frequency of bowel movements and may aid in promoting a more consistent stool texture. This action is commonly utilized in symptomatic management plans.

The primary purpose of using Egazil is to offer symptomatic assistance regarding the distress caused by ongoing, frequent bowel movements. The therapeutic objective is to help mitigate the urgent, disruptive, and frequent experience of passing stools.


Quick Fact: Relief for Diarrhea Symptoms


Eligibility and Restrictions for Use

Who Can and Cannot Use Egazil? (Hyoscyamine)

Official regulatory information defines eligibility for Egazil based on specific contraindications and required caution in certain populations. The drug must not be used by individuals with a known hypersensitivity to belladonna alkaloids or any component of the formulation.

Contraindicated Populations (Must Not Use)

Use is strictly prohibited for patients with the following high-risk conditions:

  • Glaucoma or excessive internal eye pressure.
  • Obstructive diseases of the urinary tract (e.g., bladder neck obstruction) or the gastrointestinal tract (e.g., paralytic ileus, severe ulcerative colitis, toxic megacolon, or pyloroduodenal stenosis).
  • Myasthenia gravis.
  • Unstable cardiovascular status in acute hemorrhage, or conditions like myocardial ischemia.

Populations Requiring Special Consideration

Specific populations necessitate caution or have restricted use:

Population Eligibility Status
Pediatric Patients Use is generally not recommended in children under 12 years of age for many formulations.
Geriatric Patients Use with caution due to increased susceptibility to anticholinergic effects and potential for undiagnosed glaucoma.
Pregnancy Category C (FDA). Use only if the benefit clearly outweighs the risk.
Lactation Excreted in human milk; use with caution or is not recommended by some regulatory labels.
Renal/Hepatic Impairment Requires caution due to potential altered drug clearance.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Interaction scope

Entity Description
Medicinal product categories with documented interactions CNS Depressants (e.g., barbiturates, tranquilizers). Monoamine Oxidase Inhibitors (MAOIs). Drugs eliminated by the microsomal drug metabolizing enzyme system. Antimuscarinic Agents
Specific interacting medicines (if explicitly listed) Barbiturates, tranquilizers, and Monoamine Oxidase Inhibitors (MAOIs) are explicitly noted in regulatory documents.
Mechanistic basis of interactions (only if stated in label) Pharmacodynamic Potentiation: Additive effects leading to enhanced CNS depression. Pharmacokinetic Alteration: Potential to prolong the biological half-lives of drugs dependent on the microsomal drug metabolizing enzyme system.
Timing-based interaction rules (if applicable) None specified in the official regulatory labeling.
Population-specific interaction notes (if applicable) Use requires extreme caution in patients with advanced hepatorenal disease or abnormal liver function due to heightened risk of adverse outcomes related to altered drug clearance.
Interaction-related restrictions Avoid co-administration with MAOIs. Avoid Alcohol due to potential for increased central nervous system depressant effects.

Interaction classifications (high-level)

Classification Description
Interaction severity classification (as defined in official documents) Avoidance Advised: Combinations with MAOIs. Caution/Potentiation: Use with CNS Depressants and Alcohol.
Regulatory basis U.S. Food and Drug Administration and National Institutes of Health regulatory documents.
Interaction-context constraints (as defined in official documents) CNS Depression Risk: Interaction requires caution due to additive CNS depressant effects. Metabolic Clearance Risk: Risk is present for drugs whose elimination rate is dependent on hepatic microsomal enzymes.

Resulting interaction structure

Official interaction statements:

  • Monoamine Oxidase Inhibitors (MAOIs) should be avoided due to the theoretical potential to precipitate a hypertensive crisis.
  • Central Nervous System (CNS) Depressants may have their action potentiated when co-administered, leading to additive effects.
  • Alcohol should be avoided because co-administration may increase the CNS depressant effects.
  • The drug has the potential to prolong the biological half-lives of other medicines that are eliminated by the microsomal drug metabolizing enzyme system.
  • Use requires extreme caution in patients with advanced hepatorenal disease due to the potential for hepatic coma.

Connection to the overall interaction profile (3 sentences): Regulatory documents define the product’s interaction structure primarily through two domains: the pharmacodynamic risk of additive CNS depression with substances like alcohol and other CNS depressants, and the regulatory requirement for avoidance of MAOIs. The profile also includes a pharmacokinetic caution regarding the potential to prolong the half-lives of co-administered drugs relying on microsomal enzyme clearance. These official statements delineate necessary restrictions based on documented interaction patterns.

Mechanism of Action

Egazil, which contains hyoscyamine, functions as a non-selective competitive antagonist at muscarinic acetylcholine receptors (mAChRs), including the M1, M2, and M3 subtypes, located in the smooth muscle, exocrine glands, and central nervous system. By binding to these receptors, hyoscyamine blocks the action of the endogenous neurotransmitter acetylcholine.

The consequent interruption of cholinergic signaling leads to an inhibition of parasympathetic nerve activity. Intracellularly, this antagonism prevents the mAChR-mediated signaling cascades, such as the M3-induced activation of phospholipase C and subsequent increase in inositol trisphosphate and intracellular calcium. The downstream systemic physiological consequences include a reduction in smooth muscle contractility in organs such as the gastrointestinal tract and the bladder, and a decrease in the secretion of exocrine glands, including salivary and gastric glands.

Dosage and Administration Information

How to Use Egazil: Official Administration Guidelines

Egazil is administered orally and is available in tablet (2.5 mg diphenoxylate HCl / 0.025 mg atropine sulfate) and liquid solution (2.5 mg diphenoxylate HCl / 0.025 mg atropine sulfate per 5 mL) forms. Its use is strictly defined by regulatory schedules and age-based limitations.

Standard Dosing and Frequency

Age Group Initial Daily Dosage Frequency Max Daily Dose Duration Rule
Adults (≥ 13 years) 20 mg diphenoxylate HCl Four times daily (q.i.d.) 20 mg diphenoxylate HCl Discontinue if no improvement within 10 days
Children (6 to 12 years) 0.3 - 0.4 mg/kg diphenoxylate HCl Four times daily (q.i.d.) 20 mg diphenoxylate HCl Dosage must be reduced upon initial control

Initial control is typically achieved within 48 hours, after which the dosage should be reduced to a maintenance level, which may be as low as two tablets or 10 mL of solution daily.

Administration and Procedural Rules

  1. Preparation: The oral liquid formulation must be accurately measured using a calibrated measuring device (such as a marked spoon or syringe). Tablets may be taken with or without food.
  2. Contextual Requirement: Administration must be accompanied by appropriate fluid and electrolyte therapy when indicated. If severe dehydration or electrolyte imbalance is present, the medicine must be withheld until corrective therapy is initiated.
  3. Pediatric Use Boundary: This medicine is not recommended for use in children under 6 years of age. The liquid formulation must be used for patients aged 6 to 12 years.
  4. Missed Dose: If a dose is missed, take it as soon as possible, but skip the dose if it is near the time for the next scheduled dose; doses must not be doubled.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Egazil

Evidence for Symptomatic Management of Diarrhea

Egazil (Diphenoxylate Hydrochloride with Atropine Sulfate) was studied in research exploring how symptoms change over time. Research examined changes in stool frequency and consistency. The evidence base includes small-scale crossover trials and high-quality observational studies which focused on adult populations. These trials were typically short-term, lasting only long enough to observe initial symptomatic changes.

Studies monitored measurements such as stool frequency, stool consistency, and changes in gastrointestinal transit time. Studies observed changes related to gastrointestinal transit time in the patient populations studied. These outcomes capturing phases of heightened symptom activity were a key focus of the research.

However, the long-term effects are not fully established and evidence is limited regarding the durability of response. Limited information for long-term outcomes means that the current evidence primarily contributes to understanding short-term symptom patterns. Additionally, there is a lack of recent, large-scale randomized trials focused on comparing Egazil against other antidiarrheal therapies.


Research on Diarrhea in Specific Contexts (e.g., Traveler's Diarrhea)

Beyond general use, studies explored the role of this medicine in specific situations where diarrhea is a major concern. This research mainly utilizes observational settings evaluating daily-life functioning, rather than large-scale randomized trials.

Studies in Traveler's Diarrhea

Egazil was evaluated in populations of adult international travelers. The research used cross-sectional observational trials and systematic reviews to look at outcomes reflecting daily functioning or activity level during a flare-up. Research explored changes in stool frequency and whether travelers reported an overall global assessment of their condition during their illness.

Studies in Patients Undergoing Chemoradiotherapy

Egazil was observed in a highly specific group: adult cancer patients experiencing diarrhea linked to their chemotherapy and/or radiation treatments. These studies monitored the incidence and severity of the diarrhea to see how symptoms evolved. Research describes this medicine being used in an observational setting within this specific context. However, this evidence base is considered limited due to the modest sample sizes of these specialized studies.


What Remains Uncertain in the Evidence Landscape

Scientific literature notes several research limitations and gaps in the evidence. Firstly, the comparative evidence is lacking against other available antidiarrheal treatments. Secondly, while some older trials suggest changes in symptoms, certainty remains low due to the age and modest sample sizes of some foundational studies. Finally, the long-term effects are not fully established, and follow-up durations were limited in most key studies, providing little information on maintaining symptom patterns over many months or years.

Key Studies & References

  1. Diphenoxylate Hydrochloride and Atropine Sulfate Oral Solution USP CV - Official FDA Drug Label
  2. Antimotility Agents for the Treatment of Acute Noninfectious Diarrhea in Critically Ill Patients - Practice Management Guideline - The Eastern Association for the Surgery of Trauma
  3. Class Review: Antidiarrheals - OHP Preferred Drug List (Oregon Health Plan)

Frequently Asked Questions (FAQ)

Common questions about Egazil (FAQ)

Q: Is Egazil available in forms other than tablets?

A: Yes, official product descriptions indicate that this medication is available in both a tablet form and an oral solution (liquid). Both forms contain the same combination of active ingredients.


Q: What is the dose calculation for children based on weight?

A: Regulatory guidelines outline specific dosing for children and adolescents, though the dosing schedule generally does not rely on a weight-based calculation. Official documentation provides specific guidance regarding use in different age groups.


Q: Why is the dose different for adults and children?

A: Official warnings note that the dose is different primarily due to safety considerations. Specific risks in younger patients, such as respiratory depression, and greater variability in response are noted in the label. Use of this medication is generally contraindicated, or not recommended, for children under 6 years of age.


Q: Why is the Egazil tablet concentration 2.5 mg diphenoxylate HCl / 0.025 mg atropine sulfate?

A: The manufacturer’s product description confirms that each tablet contains a specific, fixed amount: 2.5 mg of diphenoxylate hydrochloride and 0.025 mg of atropine sulfate. This combination and ratio are defined as part of the regulatory approval for this medication.


Q: What is the main thing Egazil is prescribed for?

A: Official documents state that this medication is indicated for use as adjunctive therapy—meaning it is used alongside other treatments—in the management of diarrhea. This is the primary use defined in the regulatory label.


Q: Is Egazil a type of antibiotic, painkiller, or something else?

A: Egazil is classified as a specific anti-diarrheal agent. Its primary active ingredient, diphenoxylate, is chemically related to some narcotic compounds, but it works directly to slow down the movement of the intestines.


Q: Is it normal to feel tired when first taking Egazil?

A: Yes, regulatory warnings note that feeling drowsiness, sedation, or general malaise (a feeling of discomfort) are among the adverse reactions that have been reported by patients taking this medication.


Q: What are the most commonly reported side effects of Egazil?

A: Official documents list various potential side effects. These include numbness in the extremities, a feeling of well-being (euphoria), depression, confusion, sedation, dizziness, restlessness, and headache.


Q: How long does it typically take before I might notice the effects of Egazil?

A: Pharmacokinetic data suggests that the active form of the drug, called a metabolite, typically reaches its maximum concentration in the blood within approximately 2 hours after a patient takes the tablet.


Q: Are there any specific foods or drinks I need to avoid while on Egazil?

A: Regulatory sources advise caution regarding alcohol consumption while taking this medication. The label specifically cautions that alcohol may potentiate, or increase, the action of the active ingredient, according to regulatory warnings.


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

A: The medication may cause drowsiness or dizziness. Regulatory warnings indicate caution is needed regarding activities that require full mental alertness, such as driving or operating dangerous machinery.


Q: Is Egazil habit-forming or addictive?

A: The active ingredient, diphenoxylate, is classified as a federally controlled substance. Official documentation warns of the potential for abuse and indicates that it may be habit-forming if used above prescribed levels.


Q: What is the risk of having a serious allergic reaction to Egazil?

A: Although uncommon, serious allergic reactions have been reported in official documents. These include anaphylaxis (a severe, potentially life-threatening reaction), angioneurotic edema (severe swelling), and urticaria (hives or rash).


Q: Is there a generic version of Egazil available?

A: Yes, the regulatory label refers to the medication by its generic names: Diphenoxylate Hydrochloride and Atropine Sulfate Tablets. This indicates that generic versions containing these same active ingredients are available.


Q: What do the official studies say about the effectiveness of Egazil?

A: The official indication, based on research evidence, supports the drug’s use as adjunctive therapy for the management of diarrhea. This means the medication has been formally reviewed and approved for this stated purpose.


Q: Is Egazil appropriate for people who have kidney issues?

A: Regulatory warnings advise using this medication with extreme caution in patients who have advanced hepatorenal disease (severe disease affecting both the liver and the kidneys). Processing of the medication is related to the function of both the liver and the kidneys.


Q: What is the half-life of Egazil?

A: Pharmacokinetics information indicates that the elimination half-life of the major active metabolite, diphenoxylic acid, is approximately 12 to 14 hours. The half-life refers to the time needed for the concentration of the substance in the body to decrease by half.


Q: Can Egazil be taken by people with a history of heart problems?

A: The official adverse reaction list includes tachycardia (a fast heart rate) and a fast, weak heartbeat. These reported effects may be relevant to individuals with a history of heart issues.


Q: How long does Egazil stay in my system after I stop taking it?

A: Based on the elimination half-life of approximately 12 to 14 hours, the active metabolite of the drug may take a period of time to be fully eliminated from the system after the last dose is taken.


Q: Is there evidence that Egazil has been studied in pediatric patients?

A: The official regulatory label contains specific information regarding use in children. The medication is contraindicated (should not be used) in children under 6 years of age and is not recommended for those under 2 years of age.


Q: Does alcohol consumption affect how Egazil works?

A: Yes, the official label includes a warning about alcohol. Alcohol consumption may potentiate the action of the active ingredient and can lead to an increased risk of side effects like drowsiness and dizziness.


Q: Can Egazil cause changes in mood or sleep patterns?

A: Official reports list several psychological effects as adverse reactions, including changes in mood such as depression or an unusual feeling of well-being (euphoria). Restlessness is also listed.


Q: What is the official risk classification of Egazil during pregnancy?

A: Official information states that there are no adequate and well-controlled studies in pregnant women. Usage during pregnancy is generally considered only when the potential benefit is judged to justify the potential risk to the fetus.


Q: What are the main contraindications for using Egazil?

A: Official contraindications—situations where the drug should not be used—include known hypersensitivity (allergic reaction) to the active ingredients, obstructive jaundice, and certain types of severe diarrhea, specifically that associated with pseudomembranous enterocolitis or enterotoxin-producing bacteria.


Q: How quickly does the effect of Egazil wear off after a dose?

A: The time it takes for the effect to diminish is related to the drug's metabolism. Since the elimination half-life of the active metabolite is approximately 12 to 14 hours, the drug's presence diminishes over time following the dose.


Q: Is Egazil processed by the liver?

A: Yes, pharmacokinetic data confirms that the primary active ingredient, diphenoxylate, is rapidly and extensively metabolized (broken down and processed) in humans by the liver to form its active metabolite.


Q: Does Egazil have a potential for misuse?

A: The active ingredient is classified as a controlled substance in the United States. Official documentation indicates that the risk of the drug being habit-forming relates to use above the levels prescribed.


Q: Are there different strengths or formulations of Egazil?

A: Yes, the official supply information indicates that the medication is available in the 2.5 mg tablet strength and also as an oral solution (liquid) formulation.


Q: What is the chemical or active ingredient name for Egazil?

A: The medication contains two main active ingredients: Diphenoxylate Hydrochloride and Atropine Sulfate.


Q: Is it possible to be allergic to an inactive ingredient in Egazil?

A: The drug is specifically contraindicated if a patient has a known hypersensitivity to the active ingredients. For individuals with known sensitivities to any component—active or inactive—it is important that this information is considered.


Q: What is the function of the specific enzyme that Egazil affects?

A: Regulatory text notes that the active ingredient, diphenoxylate, has the potential to inhibit the hepatic microsomal enzyme system (a group of enzymes in the liver). This inhibition can affect how the body metabolizes, or processes, other medications.


Q: Are there any demographic factors, like age or sex, that influence how Egazil works?

A: Age is a significant factor mentioned in the warnings, particularly concerning pediatric use. The medication is contraindicated for use in children under 6 years of age.


Q: What information should I know about Egazil if I am breastfeeding?

A: The official label advises that caution should be exercised when the medication is administered to a nursing woman. The component atropine is known to be secreted in breast milk, and the major active metabolite may also be secreted.


Q: How is Egazil typically packaged and dispensed?

A: The official supply information states that the tablets are typically dispensed in bottles containing a specified count. Regulatory guidance includes a requirement that the medication be kept in a child-resistant container.

How should Egazil be stored and disposed of?

How to Store and Dispose of Egazil?

The official labeling defines strict requirements for storing and discarding Egazil (Diphenoxylate HCl and Atropine Sulfate) to maintain its stability and ensure safety.

  • Mandatory Storage: Store the medicine at Controlled Room Temperature, which is 20 to 25 C (68 to 77 F), and keep it in a tightly closed container.
  • Environmental Protection: The product must be protected from light, moisture, and excess heat, and you must keep it from freezing.
  • Child Safety: Due to potential danger, Egazil must be dispensed with a child-resistant closure and should always be stored out of the reach of children.
  • Disposal: Do not keep outdated or unneeded medicine. Consult a healthcare professional or pharmacist on how to safely dispose of any unused portion. Unused product is subject to specific regulatory guidelines for controlled substances.

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

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