Levbid

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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 Levbid

Quick Facts

Property Description
Active Ingredient Hyoscyamine Sulfate
Pharmacological Class Anticholinergic Agent
Common Forms Tablets (Extended-Release, Sublingual), Oral Liquid, Injection
General Purpose Controlling spasms and reducing secretions in internal organs
Origin Derived from Tropane Alkaloids (Belladonna derivative)

Levbid: Defining the Anticholinergic Agent

Levbid is a prescription-only medication whose active ingredient is Hyoscyamine Sulfate, classifying it as a potent Anticholinergic Agent. Hyoscyamine Sulfate is a Parasympatholytic and Antispasmodic Agent, used for the regulation of hyperactivity in smooth muscle organs. This differentiation highlights Levbid as a targeted therapy for functional disturbances rather than an agent providing general pain relief. Its core mechanism involves a cholinergic blockade to reduce nerve activity.

Composition and Origin of Hyoscyamine Sulfate

The active substance, Hyoscyamine Sulfate, is a unique derivative of the tropane alkaloid group, specifically constituting the purified and highly active levorotatory isomer of the natural compound Atropine. The single-ingredient focus of Levbid is a distinctive feature, setting it apart from multi-component formulations that often combine antispasmodics with other agents. Levbid is available in multiple forms to achieve varying therapeutic needs: from immediate-acting sublingual forms to oral Extended-Release Tablets for sustained effect throughout the day. This range of delivery options offers flexibility in controlling spasms in patients who experience variable or persistent symptoms, a key factor in its pharmaceutical positioning.

General Purpose and Core Physiological Action

The fundamental purpose of this medicine is to suppress excessive activity within internal systems. By acting as a receptor antagonist, Hyoscyamine Sulfate provides two critical physiological actions: it relaxes the involuntary smooth muscles, which helps mitigate cramping and hypermotility in the digestive tract, and it simultaneously reduces glandular secretions. This overall action is leveraged to restore physiological stability in organs prone to uncontrolled movement or fluid overproduction, serving as an agent for symptomatic regulation.

Regulatory References

  1. NIH DailyMed for Hyoscyamine Sulfate

What side effects are possible with Levbid?

Possible Side Effects and Safety Information

The safety profile of Levbid (Hyoscyamine Sulfate) is defined by its activity as an anticholinergic agent, which leads to officially documented adverse reactions across several physiological systems. The primary US prescribing information lists these effects without providing quantitative frequency classifications (e.g., common, rare).

Adverse reactions frequently reflect the widespread effects of cholinergic blockade and involve the Gastrointestinal System (e.g., dry mouth, constipation, nausea, vomiting), Ophthalmic System (e.g., blurred vision, pupil dilation, increased ocular tension), and Cardiovascular System (e.g., palpitations, tachycardia). Effects on the Central Nervous System include headache, dizziness, drowsiness, confusion, and insomnia.

Documented Serious Adverse Reactions

The official labeling highlights several serious adverse reactions. Heat prostration (fever or heat stroke) is a risk due to the drug's effect of decreased sweating (anhidrosis) during high environmental temperature exposure. Diarrhea may be an early sign of incomplete intestinal obstruction, particularly in patients with ileostomy or colostomy. Additionally, psychosis and mental confusion have been reported, particularly in sensitive individuals.

Population-Specific Safety Considerations

Official regulatory documents note that older adults (geriatrics) and young children (pediatrics) have documented increased susceptibility to certain toxic effects, such as mental confusion and excitement. The drug is classified as Pregnancy Category C and is known to be excreted in human milk.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation for Levbid (Hyoscyamine Sulfate) defines overdose through an exaggeration of its anticholinergic effects. The documented clinical manifestations may include dilated pupils (mydriasis), blurred vision, tachycardia, excessive dryness of the mouth, hot dry skin, difficulty in swallowing, and signs of Central Nervous System (CNS) stimulation.

Overdose has the potential for severe, life-threatening outcomes documented in official labeling, such as paralysis of the respiratory muscles and heat prostration due to impaired sweating.

Required Emergency Actions

The official guidance requires individuals to seek emergency medical attention or call the Poison Help line if an overdose is suspected. Immediate medical care, involving stomach lavage and advanced support, may be necessary. Furthermore, the label explicitly instructs that emergency services must be called immediately if the individual has trouble breathing, has collapsed, or cannot be awakened.

For management of acute toxicity, Physostigmine is documented as an agent used in the overdose context. Supportive measures include artificial respiration if respiratory failure occurs and symptomatic treatment for managing fever or excessive CNS excitement. Specific caution is noted for elderly patients and young children, who may exhibit increased susceptibility to the toxic effects of anticholinergic agents.

Therapeutic Uses of Levbid

What Levbid Treats: Main Uses and Benefits

Levbid (Hyoscyamine Sulfate) is used for conditions involving disruptive symptoms within the body's smooth muscle systems. It is utilized in areas where symptomatic support is needed to address both excessive muscular activity and heightened glandular secretions.

The medication is used for easing symptoms related to painful visceral spasms in the gastrointestinal tract, such as those associated with Irritable Bowel Syndrome (IBS) and spastic colitis. It may offer symptomatic relief for acute conditions like renal colic (cramping from kidney stones) and is used for managing spastic bladder disturbances. Furthermore, it is applied in addressing involuntary fluid output, including profuse sweating and excessive salivation. Used during phases when symptoms become more noticeable, this medication is intended to assist in managing the overall symptom burden.

Quick Fact: Relief for Painful Spasm
Levbid is commonly used for managing spasms in the intestines, bladder, and kidneys, which may assist with maintaining functional stability during periods of heightened cramping and visceral discomfort.

Regulatory References

  1. DailyMed label hosted by the NIH

Eligibility and Restrictions for Use

Levbid (Hyoscyamine Sulfate) eligibility is determined by strict rules regarding age, pre-existing health conditions, and physiological status, as defined in official regulatory documents.

Contraindicated Populations (Must Not Use)

The medicine is contraindicated and must not be used by patients with specific severe or obstructive diseases, including glaucoma, myasthenia gravis, obstructive disease of the gastrointestinal or urinary tracts (such as paralytic ileus or prostatic hypertrophy), severe ulcerative colitis, and toxic megacolon.

Age-Related Eligibility and Caution

Age Group Eligibility Status (Official Wording)
Children under 12 Not recommended for use.
Adults & Adolescents (12+) Approved for use under standard conditions.
Older Adults (65+) Use requires cautious dose selection, reflecting the higher frequency of decreased hepatic, renal, or cardiac function.

Conditional Use and Restrictions

Official labeling requires caution when the drug is used in patients with certain conditions, including coronary heart disease, cardiac arrhythmias, hypertension, and renal disease. Regarding pregnancy, Levbid is classified as Pregnancy Category C; use is permitted only if clearly needed. For nursing mothers, caution should be exercised as the substance is excreted in human milk.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Levbid (Hyoscyamine Sulfate) is defined by its core anticholinergic activity and its effects on gastrointestinal function, as documented in regulatory sources.

Additive Pharmacodynamic Effects

Co-administration with other medicines that possess cholinergic blockade properties may result in enhanced adverse effects. This includes other antimuscarinics, certain tricyclic antidepressants, MAO inhibitors, phenothiazines, amantadine, haloperidol, and some antihistamines. These combinations carry a risk of additive adverse effects due to shared pharmacologic activity.

Absorption and Timing Constraints

Interactions involving changes to drug absorption are officially documented. Antacids may interfere with and decrease the overall absorption of Levbid. To mitigate this effect, regulatory information requires a timing separation: Levbid must be administered before meals, with antacids administered after meals. Separately, Levbid may reduce the exposure of other co-administered oral medications due to its anticholinergic effect of decreasing gastrointestinal motility.

Specific and Population-Based Risks

Specific interaction constraints apply to Potassium Chloride supplements; co-administration with wax-matrix formulations carries a documented risk of severe gastrointestinal lesions. Furthermore, the risk of toxic reactions from drug accumulation is greater for elderly patients and those with impaired renal function because the drug is substantially cleared by the kidneys.

Mechanism of Action

Levbid (hyoscyamine) functions as a non-selective, competitive antagonist at central and peripheral muscarinic cholinergic receptors. It binds specifically to the M1, M2, and M3 receptor subtypes. By occupying these binding sites, the agent prevents the neurotransmitter acetylcholine (ACh) from activating the receptors. The resulting reduction in cholinergic activity blocks the signal transduction pathway, primarily mediated by G-protein coupling, leading to a decrease in intracellular cyclic adenosine monophosphate (cAMP) levels and calcium influx in target cells. This action modulates the activity of organs regulated by the parasympathetic nervous system, including the gastrointestinal tract and the urinary system. The final physiological consequence is a reduction in smooth muscle tone and a decrease in exocrine gland secretion.

Dosage and Administration Information

How Levbid is Used: Official Administration Guidelines

Levbid (Hyoscyamine Sulfate) administration follows specific procedural patterns determining the route, dosage, and required physical handling of the medicine. The drug is available in several forms, including oral extended-release tablets, sublingual tablets, and an injection solution, which collectively permit Oral (PO), Sublingual (SL), Intramuscular (IM), Intravenous (IV), and Subcutaneous (SC) routes of administration.


Dosing and Frequency Patterns

The frequency of use is tied directly to the formulation. Extended-Release Tablets are typically administered every 12 hours (b.i.d. dosing) with an adult dose ranging from 0.375 mg to 0.75 mg per dose, not to exceed a total of 1.5 mg in 24 hours. Immediate-release forms (tablets, drops, elixir) are generally administered three to four times daily or as needed (PRN) at doses of 0.125 mg to 0.25 mg per dose. The parenteral solution (injection) may be repeated up to four times daily.


Administration Requirements

Oral formulations are subject to specific intake rules. They should be taken 30 minutes to one hour before meals and at bedtime. A necessary constraint is that the extended-release tablet must be swallowed whole and must not be crushed or chewed to preserve the intended release profile. Furthermore, oral forms should not be taken at the same time as antacids, as this may interfere with absorption.

Dose selection for older adults involves a cautious approach, with initiation at the low end of the dosing range.

Recent Clinical Evidence

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

This section provides an overview of the research evidence and clinical evaluation studies conducted on Hyoscyamine Sulfate, the active ingredient in Levbid, as described in authoritative and peer-reviewed sources. The information focuses on what the research explored and what study patterns were observed, rather than providing clinical advice or treatment recommendations.


Evidence for Use in Irritable Bowel Syndrome (IBS) Symptoms

Research has studied the agent for conditions characterized by fluctuating or episodic manifestations, particularly the outcomes related to physical discomfort experienced by adults with IBS. The evidence base primarily consists of short-term Randomized Controlled Trials (RCTs) and systematic reviews. Some trials reported patterns where measurements of outcomes related to abdominal pain changed in the study populations. However, the available data for IBS symptoms are considered limited. Research indicates that the evidence quality varies across studies, and many primary trials are older, having been conducted before modern, standardized criteria were established for diagnosing IBS, and they often involved small study populations.


Evidence for Use in Managing Acute Visceral Spasm

Research explored short-term changes in conditions associated with disruptive episodes, such as renal (kidney) or biliary colic. Studies were generally set up as adjunctive trials, meaning the medicine was studied alongside standard-of-care pain medications. Research examined outcomes that included the required amount of rescue pain medication and measurements of pain intensity scores. Findings from some studies were mixed, indicating that patterns of change in pain relief outcomes were not consistently observed when the agent was added to standard therapy. Data explored patterns related to muscle function, but the comparative evidence against other acute pain management approaches is often lacking.


Limitations and Research Gaps in the Study Landscape

Available research primarily explores short-term symptom changes and temporary physiological imbalance, and therefore, follow-up durations were limited for many key indications. Consequently, there is limited information for long-term outcomes that could describe the sustained control of symptoms or the durability of response over many months or years. The research quality varies across studies, and comparative evidence is lacking for its use against many newer agents now used for similar purposes. Research highlights what is known, but certainty remains low for the long-term patterns observed in common uses like IBS.

Key Studies & References

  1. Hyoscyamine Sulfate Tablets - DailyMed Label (Official FDA-Approved Prescribing Information)
  2. MedlinePlus: Hyoscyamine (Information derived from NIH and FDA)

Frequently Asked Questions (FAQ)

Common questions about Levbid (FAQ)

Q: What conditions is Levbid officially approved to treat?

A: According to official product information, Levbid is indicated for use as adjunctive therapy in the treatment of peptic ulcer disease. It is also used to control symptoms related to spasms in the digestive and urinary tracts, such as in spastic bladder, biliary/renal colic, and functional intestinal disorders like Irritable Bowel Syndrome (IBS).

Q: What is the purpose of the extended-release formulation of Levbid?

A: The extended-release formulation is designed to provide a sustained therapeutic effect over a longer period. The design is intended to provide a prolonged effect and sustained release, allowing for less frequent administration.

Q: What are the most common side effects reported by patients taking Levbid?

A: Official prescribing information lists adverse reactions that are common effects of anticholinergic drugs, such as dry mouth, blurred vision, dizziness, drowsiness, and constipation. The regulatory label typically focuses on listing potential effects rather than providing quantitative frequency classifications (e.g., common or rare).

Q: Do the side effects of Levbid typically decrease or go away over time?

A: Official reports have described that severe nervous system signs, such as confusion or hallucinations, have resolved within 12 to 48 hours following discontinuation. The official label does not provide specific patterns or timelines for the resolution of other, more common side effects.

Q: What are the serious side effects associated with Levbid that require immediate attention?

A: Documented serious adverse reactions include heat prostration, which is a risk due to the drug’s effect on sweating, and mental confusion or psychosis. Official documents describe symptoms for which professional medical attention may be appropriate, such as sudden eye pain, fever, or confusion.

Q: Does taking Levbid cause confusion, disorientation, or short-term memory loss?

A: Yes, central nervous system adverse reactions listed in official documents include confusion, dizziness, and drowsiness. Reports also specifically mention disorientation and short-term memory loss as CNS signs, particularly noted in sensitive or elderly patients.

Q: Is it possible for Levbid to cause difficulty or problems with urination?

A: Yes, regulatory documents list urinary hesitancy and urinary retention as possible side effects. Furthermore, the medication is strictly contraindicated for patients who have an obstructive disease of the urinary tract.

Q: Does having a kidney condition affect eligibility for taking Levbid?

A: Caution is required when the drug is administered to patients with renal (kidney) disease. Because Levbid is substantially cleared by the kidneys, official information indicates that the risk of toxic reactions may be greater due to decreased renal clearance in those with impaired renal function.

Q: Is Levbid use compatible with breastfeeding or nursing a baby?

A: The active ingredient, Hyoscyamine, is known to be excreted in human milk. Regulatory documents state that caution should be exercised when the drug is administered to a woman who is nursing.

Q: Is there official information regarding the use of Levbid during pregnancy?

A: Yes, the official classification for Levbid is Pregnancy Category C. The medication is generally considered for use during pregnancy only when the potential benefits outweigh the potential risks.

Q: Is Levbid meant to be taken for long-term use?

A: Regulatory documents note that no long-term studies have been performed in animals to determine the carcinogenic or mutagenic potential of the drug. Available clinical research predominantly focuses on short-term symptom changes. This means that official information describing sustained, long-term outcomes is limited.

Q: Is Levbid only used for irritable bowel syndrome (IBS), or are there other main uses?

A: Levbid is not limited to treating only IBS. Official prescribing information describes its use for conditions such as spastic bladder, biliary and renal colic, to reduce secretions in acute rhinitis, and as adjunctive therapy for peptic ulcer disease.

Q: What is the difference between Levbid and Levsin?

A: Both Levbid and Levsin are brand names for the same active ingredient, Hyoscyamine Sulfate. The primary difference is in the formulation, as Levbid is typically the extended-release tablet and Levsin is often the immediate-release form.

Q: Is Levbid an alternative for managing symptoms of an overactive bladder?

A: Official indications include the treatment of spastic bladder and neurogenic bladder disturbances, consistent with its muscle-relaxing action on certain organs.

Q: What types of over-the-counter medicines might interact with Levbid?

A: Regulatory information warns of additive effects with other drugs that share similar properties, including some over-the-counter antihistamines. Furthermore, antacids may interfere with the drug's absorption, requiring a timing separation during administration.

Q: Is it necessary to avoid alcohol consumption while taking Levbid?

A: Alcohol consumption may increase side effects such as drowsiness and dizziness while taking hyoscyamine. Safety documents generally recommend caution with or avoidance of alcohol, as it may increase these effects.

Q: Are there any dietary restrictions associated with taking Levbid?

A: No specific food restrictions are listed in official documents. However, administration instructions state that the medication should be taken 30 minutes to one hour before meals, and antacids must be administered separately.

Q: How quickly is Levbid typically expected to start working after the first dose?

A: The onset of effect depends on the formulation. Immediate-release forms, such as sublingual tablets, can begin working within minutes. Oral tablets or liquids may take more than 30 minutes to begin working.

Q: How long do the effects of the extended-release Levbid tablet generally last?

A: The effects of the extended-release formulation are designed to provide sustained relief for up to 12 hours. The design is intended to provide a prolonged effect and sustained release over the approximate 12-hour period between typical uses.

Q: What is the typical guidance if a dose of Levbid is missed?

A: Guidance for a missed dose typically involves taking it when remembered, unless it is close to the next scheduled administration time. Official information cautions against doubling a dose to compensate for a missed one.

Q: What are the common signs of taking too much Levbid?

A: Signs of taking too much medication may include symptoms such as headache, blurred vision, dry mouth, difficulty swallowing, nausea, vomiting, and hot, dry skin. A patient may also feel restless or nervous.

Q: Does Levbid affect blood pressure?

A: Official prescribing information lists high blood pressure (hypertension) as a pre-existing condition that requires caution when taking hyoscyamine. Regulatory sources do not list low or high blood pressure as a direct adverse reaction.

Q: Are there different brand names that contain the same active ingredient as Levbid?

A: Yes, Levbid is one of several brand names that contain the active ingredient Hyoscyamine Sulfate. Other common brand names include Levsin, Levsin SL, Anaspaz, Symax, and NuLev.

Q: Does official research mention Levbid's use in conditions like peptic ulcer disease?

A: Yes, the official Indications and Usage section describes Hyoscyamine Sulfate's use as adjunctive therapy in the treatment of peptic ulcer disease.

How should Levbid be stored and disposed of?

Storage and Disposal Requirements for Levbid

Levbid (hyoscyamine sulfate extended-release tablets) must be stored strictly according to regulatory standards to maintain its stability.

Official Storage Conditions

Condition Requirement
Temperature Store at Controlled Room Temperature (20 C to 25 C).
Excursions Permissible up to 30 C (86 F).
Protection Store in a tightly closed, light-resistant container, away from excess heat and moisture.
Container Must have a child-resistant closure and be kept in the original container.

Child Safety: The medication must be kept out of the sight and reach of children at all times.

Disposal Instructions

Unused or expired Levbid should be disposed of using a drug take-back program. If a take-back option is unavailable, the medicine should be mixed with an undesirable substance, such as dirt or used coffee grounds, placed in a sealed bag or container, and discarded with household trash. Flushing the medication is generally prohibited.

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

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