Anapaz

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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 Anapaz

Quick Facts

Property Description
Active ingredient Hyoscyamine Sulfate
Form Tablet, Oral Liquid, Sublingual, Extended-Release
Pharmacological class Anticholinergic Agent and Antispasmodic Agent
Common purpose To relieve muscle spasms and cramping in the digestive and urinary tracts
Origin Purified natural plant alkaloid derivative

Defining Anapaz and its Pharmaceutical Class

Anapaz is a pharmaceutical product available strictly by prescription, containing the single active ingredient, Hyoscyamine Sulfate. This compound is formally classified as an Anticholinergic Agent and functionally as an Antispasmodic Agent. Hyoscyamine Sulfate is a purified natural plant alkaloid derivative, specifically the levorotatory isomer of atropine, belonging to the Tropane Alkaloid class. This class of agents acts to manage involuntary smooth muscle contractions.

Available Forms and Administration Types

The active substance Hyoscyamine Sulfate is formulated for both oral and sublingual administration, and is available in multiple preparations, which is a key feature of the ingredient. These preparations include the standard tablet, oral liquid (drops), sublingual tablet, and specialized forms such as orally disintegrating tablets (ODT) and various extended-release capsules or tablets. The availability of these distinct preparations is designed to allow targeted delivery, from rapid onset using sublingual or ODT forms to sustained action with the extended-release versions.

General Purpose and Physiological Action

The general purpose of Anapaz is to reduce uncontrolled spasms and cramping of the smooth muscles in internal organs, such as those in the gastrointestinal and urinary tracts. This antispasmodic effect makes it a typical treatment option for conditions characterized by functional overactivity. The mechanism is based on the drug acting as an antimuscarinic agent; it works by blocking the action of acetylcholine, the neurotransmitter responsible for stimulating involuntary contractions and secretions. By interrupting this nerve signal transmission, the medication helps to lessen the functional overactivity of these organ systems.

Regulatory References

  1. Hyoscyamine Sulfate Label - DailyMed

What side effects are possible with Anapaz?

Possible Side Effects and Safety Information

The safety profile of Anapaz (Hyoscyamine Sulfate) is structured by the systemic effects documented in official regulatory labeling. These adverse reactions are characteristic of anticholinergic agents and are categorized based on the organ systems affected.

Documented Adverse Reactions

The most commonly listed adverse reactions relate to the medicine's primary action, leading to effects across multiple systems. These are typically listed without explicit numerical frequency classification in the primary regulatory documents but represent expected effects.

System-Organ Class Officially Documented Effects
Gastrointestinal Dry mouth, constipation, nausea, vomiting, abdominal distension.
Ocular Blurred vision, increased ocular tension, mydriasis (pupil dilation), photophobia.
Cardiovascular Tachycardia (increased heart rate), palpitations.
Central Nervous System Headache, dizziness, nervousness, drowsiness, and potential for confusion and excitement.
Skin/General Anhidrosis (suppressed sweating), urticaria, and other allergic responses.
Urinary Urinary hesitancy, urinary retention.

Serious Safety Considerations

Official labeling highlights the potential for serious adverse reactions. These include the risk of heat prostration (hyperthermia/fever) due to the suppression of sweating, and the development of severe central nervous system effects, such as acute confusion, particularly in older adults. Instances of severe allergic reactions (anaphylaxis) are also documented.

Population-Specific Safety Notes

Regulatory documents state that older adults are particularly susceptible to CNS effects like confusion and excitement, as well as urinary retention. Pediatric patients are noted to have a significant risk of hyperthermia. Many adverse effects are officially recognized as being dose-related and may be more evident at the initiation of treatment or following an increase in dosage.

Safety Restrictions and Limitations

This medicine is formally contraindicated by regulatory authorities in individuals with specific pre-existing conditions, including angle-closure glaucoma, obstructive diseases of the urinary or gastrointestinal tracts, myasthenia gravis, and severe ulcerative colitis.

Overdose and Emergency Response

An overdose of the active ingredient, Hyoscyamine Sulfate, is officially documented in regulatory labeling as an exaggeration of the drug's effects, requiring immediate emergency medical attention.

Documented Overdose Manifestations

Overexposure may present with a specific cluster of clinical signs. These include central nervous system (CNS) stimulation, blurred vision, dilated pupils (mydriasis), hot dry skin, and dryness of the mouth. Other common documented symptoms are headache, dizziness, nausea, vomiting, and difficulty in swallowing.

Severe Outcomes and Required Actions

Overdose may progress to severe or life-threatening complications. Regulatory documents note the risk of intense excitement that demands immediate attention and the development of a curare-like effect that can lead to paralysis of the respiratory muscles.

If overexposure is suspected, immediate medical care is mandatory. Regulatory instructions specify that interventions may include immediate lavage of the stomach and symptomatic management for fever using tepid water sponge baths or a hypothermic blanket. The specific agent Physostigmine is listed in the labeling as an appropriate intervention for intravenous administration. In cases of respiratory muscle paralysis, artificial respiration must be instituted and maintained until effective breathing returns.

Therapeutic Uses of Anapaz

Quick Facts: Therapeutic Domains

  • Assists in the management of: Symptoms of irritable bowel syndrome (IBS).
  • Therapeutic utility: Addresses cramping and painful conditions associated with the gastrointestinal and genito-urinary tracts.
  • Symptom relief: Helps relieve bladder spasms and stomach cramps.

What Anapaz Treats: Main Uses and Benefits

Anapaz (hyoscyamine sulfate) is a prescribed medication utilized to provide assistance in managing symptoms across a range of conditions. Its primary application is in the treatment of symptoms associated with Irritable Bowel Syndrome (IBS). The medication may help to provide relief from cramping, spasm, and pain in the gastrointestinal tract.

It also has therapeutic utility in addressing certain issues within the genito-urinary and biliary tracts that involve painful conditions and spasm. Specifically, Anapaz may be used to address bladder spasms. Furthermore, this agent is sometimes employed to reduce certain bodily secretions, such as saliva or stomach acid. It is a management option that should be discussed fully with a qualified healthcare professional.


Eligibility and Restrictions for Use

Eligibility for Anapaz (Hyoscyamine Sulfate)

Official regulatory documents define strict criteria for who can and cannot use Anapaz, primarily based on the drug's anticholinergic properties. Use is generally established for adults and pediatric patients aged 2 years and older, although use in children under 12 years is often not recommended for certain formulations.

Classification Population/Condition
Absolutely Contraindicated Glaucoma, Obstructive Uropathy (e.g., prostatic hypertrophy), Obstructive Disease of the GI Tract, Paralytic Ileus, Toxic Megacolon, Severe Ulcerative Colitis, Myasthenia Gravis, or Unstable Cardiovascular Status in Acute Hemorrhage.
Use with Caution Only Renal impairment, Cardiac conditions (e.g., arrhythmias, hypertension), Hyperthyroidism, and in the elderly due to increased susceptibility to side effects.
Pregnancy / Lactation Pregnancy Category C; should be given only if clearly needed. The drug is known to be excreted in human milk, requiring caution for nursing mothers.

These restrictions reflect official governmental classifications and are intended to prevent adverse effects stemming from reduced smooth muscle activity or compromised organ function.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section describes the officially documented interaction patterns for Anapaz (Hyoscyamine Sulfate) as stated in regulatory prescribing information.

Interaction Type Interacting Agent or Class Official Regulatory Statement
Pharmacodynamic Other Antimuscarinics, Tricyclic Antidepressants, MAO Inhibitors, Phenothiazines, Amantadine, and certain Antihistamines Co-administration may result in additive adverse effects stemming from cholinergic blockade.
Pharmacokinetic (Absorption) Antacids (e.g., Aluminum Hydroxide, Almasilate) Antacids may interfere with the absorption of Hyoscyamine Sulfate, potentially resulting in reduced serum concentration.
Pharmacokinetic (Absorption) Other Oral Medications (in general) The absorption of other orally administered drugs may be decreased due to Hyoscyamine's effect of decreasing gastrointestinal motility and delaying gastric emptying.
Substance Interaction Alcohol (Ethanol) The use of alcohol may cause increased side effects such as dizziness or drowsiness (additive CNS depression).

Interaction-Related Restrictions and Timing Rules

To mitigate the absorption interference with Antacids, regulatory documents specify a required time separation: Hyoscyamine Sulfate should be administered before meals, and Antacids should be administered after meals.

Specific combinations, including co-administration with other potent anticholinergic agents like Aclidinium, are assigned a high-risk classification (e.g., Risk X: Avoid) in some regulatory-aligned databases, indicating the severe potential for exacerbated adverse effects.

Population-Specific Notes

Documentation states that the risk of toxic reactions may be greater in geriatric patients with impaired renal function, as the drug is substantially excreted by the kidney.

Mechanism of Action

Anapaz is classified as a small molecule inhibitor. Its pharmacodynamic action begins with its selective interaction as an antagonist at the A1R receptor, which is expressed primarily on the membrane of osteoclast precursors. This interaction prevents the binding of endogenous signaling molecules that normally initiate the cascade for cellular maturation.

By blocking A1R, Anapaz disrupts the downstream activation of key intracellular transcription factors essential for the specialization and function of bone-resorbing cells. This interruption effectively inhibits the differentiation and maturation of pre-osteoclasts into mature, active osteoclasts. The consequence of this cellular modulation is a reduction in the overall population of active osteoclasts within the bone microenvironment. As a result, the drug achieves a system-level modulation of the bone resorption rate, ensuring that the process remains within controlled physiological limits.

Dosage and Administration Information

Administration Guidelines

Anapaz (hyoscyamine sulfate 0.125 mg tablets) is an immediate-release medication administered by the oral or sublingual route.

Dosage and Frequency

The dosage should be individualized to achieve symptomatic control while minimizing side effects. The tablets are typically taken as needed, with dosing intervals of at least four hours:

Age Group Single Dose Range Maximum Daily Dose
Adults and Children 12 years 1 to 2 tablets (0.125 mg each) 12 tablets (1.5 mg)
Children 2 to < 12 years 1/2 to 1 tablet (0.125 mg each) 6 tablets (0.75 mg)

Procedural Steps

  1. Route of Administration: The tablets may be swallowed, chewed, or placed under the tongue (sublingual) to dissolve quickly. Orally disintegrating tablets (ODT) are placed on the tongue to dissolve and then swallowed, with or without water.
  2. Timing: The dose should be taken 30 to 60 minutes before meals and at bedtime.
  3. Antacids: If you are taking antacids, they should be taken at least one hour after your dose of Anapaz to prevent decreased drug absorption.

Missed Dose Instructions

If a dose is missed, take it as soon as you remember. If it is almost time for the next scheduled dose, skip the missed dose and resume your regular schedule. Do not take a double or extra dose to compensate for the missed one.


Recent Clinical Evidence

Research evidence / Overview of Studies for Anapaz (Hyoscyamine Sulfate)


Evidence for Use in Irritable Bowel Syndrome (IBS) Symptoms

Research exploring the role of Anapaz (hyoscyamine sulfate) and related antispasmodic agents has often been conducted in adults experiencing the painful cramping and discomfort associated with Irritable Bowel Syndrome (IBS). The evidence base includes older, short-term randomized controlled trials (RCTs) and systematic reviews that have explored the role of this drug class. In these studies, researchers monitored patient-reported outcomes describing perceived discomfort and how symptoms related to abdominal pain evolved over the defined study periods.

Studies were designed to observe differences in symptom patterns between patients who received the medication and those who received an inactive placebo. When considering the antispasmodic class as a whole, research highlights changes measured during the study period related to physical discomfort. Specific findings for hyoscyamine often stem from trials that were modest in sample size and where outcomes were reported over limited follow-up durations (e.g., a few weeks).


Evidence for Use in Genito-Urinary and Bladder Spasms

The medication was studied in research contexts involving conditions associated with acute or disruptive episodes of spasm in the genito-urinary and bladder tracts. The evidence for this use is often derived from observational settings and the established pharmacological categorization of this anticholinergic agent. Researchers examined outcomes related to systemic or functional imbalance, such as patient-reported measures of urgency and frequency of urination. Data show patterns related to observed changes in smooth muscle activity; however, this evidence is often less consolidated than results coming from dedicated, large-scale clinical trials for IBS.


Long-Term Studies and Follow-Up Duration

Most core research for Anapaz and similar agents focused on acute symptom changes, meaning that follow-up durations were limited. Consequently, long-term effects are not fully established regarding the use of Anapaz as a maintenance therapy. Evidence highlights patterns observed for short-term changes, but there is limited information for long-term outcomes such as durability of response or whether patterns observed in the studies change over extended periods.


Gaps in Research and Areas of Uncertainty

The overall evidence landscape for Anapaz is limited by the fact that many of the original studies are older, often predating current standardized research methodologies and diagnostic criteria. This means that evidence quality varies across studies and some methodological limitations, such as modest sample sizes, have been noted in regulatory reviews. Comparative evidence is lacking for many modern, head-to-head trials against newer treatments.

Key Studies & References

  1. Label: HYOSCYAMINE SULFATE tablet (DailyMed / FDA Regulatory Information)
  2. Label: LEVSIN- hyoscyamine sulfate tablet (DailyMed / FDA Regulatory Information, including pediatric use)

Frequently Asked Questions (FAQ)

Common questions about Anapaz (FAQ)

Q: What is the primary effect of Anapaz and how long does it usually last?

A: Regulatory pharmacokinetic data indicates the elimination half-life of the active ingredient is typically between 2 and 3.5 hours. This measurement represents the time required for the amount of drug in the body to be reduced by half. Most of the drug is eliminated from the body unchanged, primarily via the urine, within 12 hours of administration.

Q: What kind of benefits should I generally expect from Anapaz?

A: According to official product information, the medicine is approved to help relieve symptoms of cramping and spasms. This occurs because the drug relaxes the smooth muscles in organs like the digestive tract and bladder. Additionally, it helps to lessen excessive secretions, such as stomach acid, saliva, and sweat.

Q: Is the term 'Anapaz' the brand name or the chemical name?

A: Anapaz is a brand name used for the product. The official chemical name for the active substance found in Anapaz is Hyoscyamine Sulfate, which is the generic name.

Q: Is there a generic version of Anapaz that is widely available?

A: Yes, the active ingredient is Hyoscyamine Sulfate, which is the generic name for the brand name Anapaz. Official product information confirms that lower-cost generic versions containing this active ingredient are generally available and may be lower-cost alternatives.

Q: Is Anapaz considered a controlled substance in any region?

A: Official government classification confirms that the active ingredient, Hyoscyamine Sulfate, is not designated as a controlled substance by the U.S. Drug Enforcement Administration (DEA). This classification applies to the single-ingredient formulation and indicates it is not associated with being habit-forming.

Q: How quickly does Anapaz typically begin to show an effect?

A: The speed of absorption depends on the form taken. Official regulatory information indicates that the active ingredient is fully absorbed whether taken orally or sublingually (dissolved under the tongue). However, the onset of effects may not occur as rapidly with standard oral administration compared to sublingual administration.

Q: Is Anapaz considered a long-term treatment?

A: The regulatory documents indicate that the evidence base for Anapaz is largely derived from short-term studies focusing on acute symptoms. Official documentation on long-term safety, such as potential effects on fertility or cancer risk, has not been established through dedicated long-term animal studies. This means its suitability for extended, maintenance therapy is not fully detailed in regulatory sources.

Q: How long do initial common side effects usually persist?

A: The general duration for all common side effects is not specified in the regulatory information. However, official labeling notes that more acute central nervous system effects, such as confusion or excitement, are expected to resolve within 12 to 48 hours after the medication is discontinued.

Q: Does Anapaz interact with common over-the-counter painkillers?

A: The official drug interaction profile notes a general caution for all orally administered medications. Because Anapaz can slow down movement in the gastrointestinal tract, the absorption of other oral medications may be decreased. The regulatory caution suggests reviewing proper timing with a healthcare professional to manage this potential interaction.

Q: Can I take Anapaz with my daily vitamin or mineral supplements?

A: Regulatory information includes a general warning that the absorption of other orally taken drugs can be affected due to a decrease in digestive tract movement caused by Anapaz. This effect may also apply to orally administered supplements like vitamins and minerals.

Q: Are there certain food types or beverages that can affect Anapaz?

A: Official documents do not list specific foods that must be avoided. However, the liquid form of the medication may contain sugar or alcohol. Caution is therefore noted in the official labeling for individuals with conditions like diabetes or alcohol dependency who are using the liquid formulation.

Q: Can individuals with a history of liver problems safely use Anapaz?

A: The official labeling does not include liver disease as an absolute contraindication, but it mandates caution. Regulatory documents explicitly state that the medicine should be used with careful consideration in patients who have a history of hepatic (liver) disease.

Q: Is there a reported withdrawal period when a person stops using Anapaz?

A: The regulatory profile for the single-ingredient medication does not describe a clinical dependence or withdrawal syndrome. For the few users who experience acute central nervous system side effects, official data indicates that those effects typically resolve within 12 to 48 hours after stopping the drug.

Q: Do I need any specific blood tests or monitoring while taking Anapaz?

A: Regulatory labeling does not specify mandatory routine blood tests for all users. However, because the drug is significantly processed and excreted by the kidneys, official information suggests that monitoring kidney function may be useful, particularly for older adults.

Q: How long has Anapaz been approved and available in the US or EU?

A: The active ingredient in Anapaz is part of an older class of drugs. Official U.S. regulatory information indicates that some formulations containing Hyoscyamine Sulfate have been marketed in the U.S. since at least 1973.

How should Anapaz be stored and disposed of?

Storage Conditions and Protection

Anapaz (Hyoscyamine Sulfate) must be stored at Controlled Room Temperature, specifically between 20 C to 25 C (68 F to 77 F). The medication must be protected from excessive heat and moisture, and the oral liquid formulation must be protected from freezing. To maintain stability, the product should be kept in its original container and the container must be tightly closed when not in use.

Child Safety and Disposal

It is an official regulatory requirement that this medication be stored out of the reach of children. For disposal, unused or expired Anapaz must be handled according to local regulations. The medication should not be disposed of by flushing it down a toilet or pouring it into a drain.

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

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