Lofenoxal

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Lofenoxal

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Lofenoxal

Lofenoxal is a prescription-only, fixed-dose combination drug classified as an antidiarrheal agent intended for oral use.

Property Description
Active ingredients Diphenoxylate hydrochloride and Atropine sulfate
Form Tablet and oral solution
Pharmacological class Opioid agonist / Anticholinergic combination
General purpose To regulate an overly active bowel
Origin Synthetic derivative (Diphenoxylate) and natural derivative (Atropine)

What Type of Drug is Lofenoxal?

Lofenoxal is defined by the necessary pairing of its two primary substances: the synthetic antiperistaltic agent, Diphenoxylate hydrochloride, and the Atropine sulfate, which acts as a deterrent to misuse. The drug's core classification is rooted in its action to slow the excessive transit of contents through the intestinal tract. This combination ensures controlled use, reflecting the fact that the diphenoxylate component is chemically related to the opioid class of medications. This medicine is designed to effectively manage the symptoms of diarrhea by directly influencing bowel activity. Clinical practice has long recognized the efficacy of this fixed-dose antiperistaltic approach for controlling bowel regularity.


The Composition and Purpose of Lofenoxal

The general purpose of Lofenoxal is to regulate an overly active bowel by directly slowing intestinal movement. The diphenoxylate component achieves this by reducing the speed of the propulsive contractions (peristalsis) in the gut, which prolongs the time stool remains in the colon. This physiological slowdown is essential, as it allows the body to maximize the reabsorption of necessary water and electrolytes, which consequently helps to restore more normal stool consistency and frequency during episodes of diarrhea. Other products with this same Diphenoxylate/Atropine combination include the popular brands Lomotil and Lonox. The formulation is specifically positioned for use in cases of persistent, severe diarrhea where slowing motility is the primary therapeutic requirement.

What side effects are possible with Lofenoxal?

Possible side effects and safety information

This section outlines the officially documented adverse reactions and safety restrictions for Lofenoxal, based strictly on government regulatory documents.

Frequency-Classified Adverse Reactions

Adverse reactions are primarily categorized by the body system affected and their reported frequency. Common side effects—meaning they occur in at least 1 in 100 people—may include gastrointestinal effects such as nausea, vomiting, dry mouth, and abdominal discomfort.

Central nervous system effects such as headache, dizziness, drowsiness, and sedation are also classified as common. Psychiatric effects like euphoria, depression, and restlessness have been reported.

Serious Adverse Reactions and Safety Restrictions

Serious and clinically significant risks are documented. These include the potential for toxic megacolon, a severe and potentially fatal complication observed with chronic use or in certain acute diarrheal illnesses. The drug is contraindicated in patients with diarrhea caused by Clostridium difficile or enterotoxin-producing bacteria.

Respiratory depression is a critical risk, particularly at high doses or in vulnerable populations.

Population-Specific Safety Considerations

Regulatory documents impose specific restrictions concerning age. Lofenoxal is contraindicated in children under 6 years of age, and its use is generally not recommended for children under 12 due to the heightened risk of serious adverse events like respiratory depression.

Caution is also required for patients with advanced liver or kidney impairment due to the potential for increased drug exposure and enhanced central nervous system effects. Furthermore, the drug is classified as a controlled substance due to the potential for dependence and abuse associated with chronic or high-dose use.

Overdose and Emergency Response

The official regulatory profile for Lofenoxal overdose is characterized by the combined toxicity of its two active components. Overdose manifestations may include a dangerous combination of opioid-like symptoms, such as severe respiratory depression, lethargy, and pinpoint pupils (miosis), alongside anticholinergic symptoms, including tachycardia, hyperthermia, flushing, and dryness of the skin and mucous membranes.

Severe and life-threatening outcomes documented in regulatory labels are coma, the risk of permanent brain damage, and death. Due to the slow absorption of the diphenoxylate component, the onset of severe respiratory depression can be significantly delayed for up to 30 hours following ingestion.

Because of these severe outcomes, government labeling mandates that individuals seek immediate medical attention at once if an overdose is suspected or if either opioid or anticholinergic symptoms develop. The required clinical action involves the administration of Naloxone hydrochloride to reverse respiratory effects, along with other supportive treatment. Prolonged and careful monitoring for 12 to 30 hours is essential due to the documented risk of symptom recurrence.

Regulatory authorities specifically note that pediatric patients less than 6 years of age are highly vulnerable to severe central nervous system and respiratory depression, which risks permanent brain damage or death.

Therapeutic Uses of Lofenoxal

What Lofenoxal Treats: Main Uses and Benefits

Lofenoxal (containing diphenoxylate hydrochloride and atropine sulfate) is commonly used across conditions presenting with acute episodes in the gastrointestinal system. The therapeutic domain is relevant for easing symptoms related to inflammatory or irritative states.

The combination is used for the symptomatic treatment of diarrhea. This formulation helps address symptom clusters that create noticeable physiological strain and contributes to improved comfort during symptomatic periods. The goal of using Lofenoxal is to provide supportive relief when symptoms interfere with routine activities.

“This treatment is relevant when supportive symptom management is appropriate, especially in clinical settings that involve acute or unstable symptom patterns.”

The medication supports the patient during difficult episodes by easing distress and assists with maintaining functional stability.


Quick Fact: Relief for Acute Diarrhea Symptoms

Regulatory References

  1. DailyMed drug label from the National Institutes of Health (NIH)

Eligibility and Restrictions for Use

Who Can and Cannot Use Lofenoxal?

The official regulatory profile for Lofenoxal (Diphenoxylate hydrochloride and Atropine sulfate) strictly defines who is eligible to use the medicine based on age, existing health conditions, and physiological status.


Approved and Restricted Populations

Lofenoxal is indicated for use in patients 13 years of age and older as adjunctive therapy in the management of diarrhea. Safety and effectiveness are not established for children younger than 13. For pregnant women, the medicine is classified as Pregnancy Category C, permitting use only when the potential benefit justifies the potential risk. Use requires caution in nursing mothers as both components are excreted in breast milk.


Absolute Contraindications

Use is absolutely contraindicated in several populations due to severe risk as documented in regulatory labeling:

  • Pediatric patients less than 6 years of age (risk of severe respiratory and CNS depression).
  • Patients with obstructive jaundice or known hypersensitivity to either active ingredient.
  • Patients with infectious diarrhea associated with enterotoxin-producing bacteria or C. difficile (pseudomembranous enterocolitis).
  • Patients with existing intestinal obstruction or paralytic ileus.

Conditional Use

The label mandates extreme caution for patients with advanced hepatorenal disease or abnormal liver function due to the risk of precipitating hepatic coma. Use also requires careful observation in cases of acute ulcerative colitis.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Lofenoxal (Diphenoxylate hydrochloride and Atropine sulfate) is defined by officially documented co-administration restrictions and pharmacodynamic effects, as described in regulatory prescribing information.


Formal Restrictions and Contraindicated Combinations

The co-administration of Lofenoxal with Monoamine Oxidase Inhibitors (MAOIs) is a combination listed as contraindicated. This restriction is based on the theoretical risk that the diphenoxylate component, which is chemically related to meperidine, could precipitate a hypertensive crisis. Concurrent use of alcohol must also be avoided, as it may increase the drug's Central Nervous System (CNS) depressant effects.


Pharmacodynamic Potentiation

Lofenoxal may potentiate the action of other CNS depressants. Co-administering the drug with agents such as barbiturates, benzodiazepines, other opioids, antihistamines, and tranquilizers is associated with an increased risk of CNS adverse reactions, including pronounced drowsiness and dizziness.


Population-Specific Interaction Notes

Officially documented interaction cautions exist for specific patient populations. The drug must be used with extreme caution in individuals with advanced hepatorenal disease or abnormal liver function, due to the potential to precipitate hepatic coma. For nursing mothers, regulatory information notes that both diphenoxylate hydrochloride and atropine sulfate are excreted in breast milk.

Mechanism of Action

How Lofenoxal Works

Lofenoxal’s mechanism of action involves the engagement of two distinct receptor systems within the gastrointestinal tract, impacting intestinal propulsive movement and secretions.


Modulating Motility via Opioid Receptors

This core mechanistic domain involves diphenoxylate, which acts as an agonist on mu-opioid receptors located on the enteric nerves within the intestinal wall. By engaging these receptors, Lofenoxal suppresses the hyperactive signaling that drives excessive propulsive motility (peristalsis) in the intestines. This action slows the passage of intestinal contents; the resulting increase in transit time contributes to a greater opportunity for the movement of water and electrolytes across the intestinal wall.


Regulating Secretions via Anticholinergic Activity

The formulation includes trace amounts of atropine, introducing a secondary, minor mechanistic domain: anticholinergic activity. Atropine acts as an antagonist at muscarinic acetylcholine receptors, which may contribute to a reduction in gastrointestinal secretions and promote a decrease in intestinal smooth muscle tone. This muscarinic receptor antagonism provides a peripheral physiological effect that increases with concentration.

Dosage and Administration Information

How to Use Lofenoxal: Official Administration Guidelines

Lofenoxal (Diphenoxylate hydrochloride and Atropine sulfate) is a prescription-only, fixed-dose combination drug intended solely for oral administration. The pattern of use is defined by specific dosage rules, frequency adjustments, and mandatory contextual conditions.


Administration Scope

The medicine is typically used initially at a higher frequency to achieve control, with the regimen reduced once stability is reached. The administration protocol specifies dosage, population limits, and prerequisite conditions for proper use.

Instruction Category Official Guidelines
Route of administration Oral (taken by mouth).
Dosing schedule (Adults ge 13 years) Initial dose is typically 5 mg of the diphenoxylate component four times daily. The total daily intake must not exceed 20 mg of diphenoxylate.
Timing in relation to meals Can be taken with or without food.
Preparation requirements The oral solution must be measured using a calibrated dosing device to ensure dosage accuracy.

Use Patterns and Restrictions

Administration is subject to time limits and patient-specific rules. The full daily dosage should not be continued for more than 10 days if chronic symptoms do not show improvement, indicating the short-term, adjunctive nature of the therapy.

Restriction Category Official Guidelines
Age-group rules Children 6 to under 13 years must only use the oral solution, with dosing based on body weight. Use is not recommended for those under 6 years old.
Procedural conditions The drug must be withheld if the patient has severe dehydration or electrolyte imbalance until corrective fluid and electrolyte therapy has been initiated.

Procedural Structure

The protocol mandates beginning the specified initial dose, reducing the dose once clinical control is established, and strictly discontinuing treatment if the time-bound 10-day limit for the maximum dose is reached without adequate response. This structure ensures adherence to the limits on both frequency and duration of use.

Recent Clinical Evidence

Lofenoxal: Recent Clinical Evidence

Research on Symptom Management

Lofenoxal (Diphenoxylate/Atropine) was evaluated in research exploring the management of both short-term, acute episodes and more prolonged, chronic diarrhea. Researchers primarily utilized Randomized Controlled Trials (RCTs) and Crossover Studies, often designed to compare the drug to other antiperistaltic medications or a placebo. These studies focused on outcomes related to systemic or functional imbalance, specifically by monitoring measurements of stool frequency and stool volume/weight during the study period. Studies also monitored the documented time to symptom resolution.

Findings describe patterns observed in the studies regarding recorded measurements in these bowel parameters. Research describes symptom patterns observed in people with chronic issues, such as diarrhea linked to inflammatory or irritative states. The research examined comparative trials where participants received the combination drug, a placebo, or other active agents, and reported measurements of changes in key outcomes. Findings describe patterns related to this combination, and the research is part of the broader evidence landscape.

Evidence Gaps and Limitations

Research has explored Lofenoxal's use in specific patient subgroups, including critically ill adults experiencing acute non-infectious diarrhea and patients after intestinal resection. However, the available evidence base contains several limitations. Data for certain groups remain insufficient, especially concerning the pediatric population, with few data available for children under the age of 13.

Furthermore, studies typically focused on episodes over a short-term window of up to 10 days, and follow-up durations were limited in many trials. Long-term effects are not fully established, and there is limited information regarding its evaluation over extended periods. Overall, the body of evidence relies on older studies and a small number of high-quality RCTs, meaning research provides context but findings describe group patterns, not personal outcomes.

Key Studies & References

  1. Label: DIPHENOXYLATE HCL AND ATROPINE SULFATE tablet

Frequently Asked Questions (FAQ)

Common questions about Lofenoxal (FAQ)


Q: Is it normal to feel a change in appetite while using Lofenoxal?

Regulatory documents list loss of appetite as a reported adverse effect that may occur with the use of Lofenoxal. As with any adverse effect, this is information that should be shared with a healthcare professional.


Q: Does the time of day I take Lofenoxal matter?

Official prescribing information states that Lofenoxal is typically taken four times daily. The four-times-daily schedule is described to support consistent levels of the medicine. However, the information does not specify fixed morning, afternoon, or evening timing.


Q: Can Lofenoxal be cut in half or crushed for easier swallowing?

Official administration guidelines for the tablet form of Lofenoxal do not include instructions for altering the pill, such as cutting or crushing it. If difficulty swallowing tablets is a consideration, regulatory documents note that the medicine is also available as an oral liquid solution.


Q: Can you build up a tolerance to the effects of Lofenoxal over time?

The official classification of Lofenoxal reflects a caution regarding chronic use. Regulatory agencies classify the drug as a controlled substance (Schedule V) because of the potential for dependence and abuse, which are related safety concerns associated with extended or high-dose use.


Q: What if a user experiences a very rare side effect listed in the documents?

Government-aligned resources advise that any serious or unusual adverse reaction should be brought to the attention of a healthcare professional promptly. They can provide the necessary guidance based on the individual's health status.


Q: What evidence exists about the effectiveness of Lofenoxal in real-world settings?

Clinical trials reviewed by regulatory bodies indicate that therapeutic improvement for acute diarrhea is typically observed within 48 hours of starting the maximum recommended daily dosage. This measurement of time to improvement serves as an indication of the pattern observed in studies.


Q: Are there different strengths or formulations of Lofenoxal?

Yes, official prescribing information lists Lofenoxal as typically available in two forms: a tablet (usually containing 2.5 mg of the diphenoxylate component) and an oral liquid solution.


Q: What are the specific components or ingredients in the Lofenoxal tablet?

The tablets contain the active ingredients, which are diphenoxylate hydrochloride and atropine sulfate. Additionally, the product includes various inactive ingredients (excipients), which are non-medicinal components often used to create the tablet form, such as starch, cellulose, and magnesium stearate.


Q: Is it necessary to have regular check-ups while on Lofenoxal?

Official product information suggests that the prescribing doctor must check a patient's progress at regular visits. This monitoring is described as necessary to check for proper function and unwanted effects.


Q: How long does it usually take for Lofenoxal to start working after I take it?

Official clinical studies report that the onset of the expected therapeutic effect—which is the clinical improvement of acute diarrhea—is typically observed within 48 hours of initiating the maximum recommended daily dosage.


Q: How long does one dose of Lofenoxal stay active in the body?

The main active substance, diphenoxylate, is converted in the body to an active metabolite called difenoxin. Regulatory information on the pharmacokinetics of these components reports an approximate half-life ranging from 2.5 hours (diphenoxylate) to 4.5 hours (difenoxin).


Q: Is Lofenoxal considered a long-term treatment or is it for short-term use?

Lofenoxal is officially recommended as adjunctive therapy—meaning it is used in addition to other measures. Regulatory guidelines specify that the maximum daily dose should be discontinued if clinical improvement is not noted within 10 days, suggesting its use for short-term management.


Q: What happens if I miss a dose of Lofenoxal?

Guidance from government-aligned patient resources indicates that if a dose is missed, official guidance advises skipping the missed dose and returning to the regular dosing schedule, and it cautions against doubling the dose.


Q: Why do official documents mention certain populations cannot use Lofenoxal?

Regulatory documents list restrictions to protect against the potential for serious risks. For example, it is contraindicated in young children due to the risk of severe respiratory and central nervous system (CNS) depression. It is also restricted in patients with specific infectious diarrheas due to the risk of conditions like toxic megacolon.


Q: Is Lofenoxal available over the counter in some countries?

In the US, Lofenoxal is classified as a prescription-only controlled substance (Schedule V). The over-the-counter status of similar preparations varies by country and is dependent on the specific legal classification.


Q: Are there any lifestyle changes recommended alongside the use of Lofenoxal?

Official warnings emphasize that the use of Lofenoxal should be accompanied by appropriate fluid and electrolyte therapy. Additionally, alcohol should be avoided while taking the medicine, and caution is advised for activities requiring mental alertness, such as driving, due to the risk of dizziness or drowsiness.


Q: What conditions make someone ineligible to take Lofenoxal?

Official prescribing information lists several conditions that make someone ineligible. These include obstructive jaundice, specific kinds of infectious diarrhea (like C. difficile), intestinal obstruction, paralytic ileus, and known hypersensitivity to the active ingredients.


Q: What are the long-term effects of using Lofenoxal for several years?

Regulatory reports note that clinical studies primarily focused on short-term use, and therefore, the long-term effects are not fully established. Any use beyond the short-term duration described in the label is a matter that requires the oversight of a healthcare professional due to the potential risks.


Q: What happens when Lofenoxal interacts with other opioids?

Regulatory information indicates that co-administration with other opioids may potentiate the depressant effects on the central nervous system (CNS). This combined action can lead to an increased risk of side effects such as pronounced drowsiness and dizziness.


Q: What happens when Lofenoxal interacts with benzodiazepines?

Co-administration with benzodiazepines is noted in official documents to potentially potentiate the central nervous system (CNS) depressant effects. This interaction can lead to higher risks of side effects, including pronounced drowsiness and dizziness.


Q: What happens when Lofenoxal interacts with barbiturates?

Official labeling states that co-administration with barbiturates may potentiate the central nervous system (CNS) depressant effects. This increased action can lead to higher risks of side effects such as pronounced drowsiness and dizziness.


Q: What happens when Lofenoxal interacts with antihistamines?

Regulatory information notes that co-administration with antihistamines may potentiate the depressant effects on the central nervous system (CNS). This combined effect can lead to an increased risk of side effects like pronounced drowsiness and dizziness.


Q: What happens when Lofenoxal interacts with tranquilizers?

Official prescribing information states that co-administration with tranquilizers may potentiate the central nervous system (CNS) depressant effects. This heightened interaction can lead to an increased risk of side effects such as pronounced drowsiness and dizziness.

How should Lofenoxal be stored and disposed of?

How to Store and Dispose of Lofenoxal

Lofenoxal (diphenoxylate hydrochloride and atropine sulfate) must be stored at Controlled Room Temperature, which is 20 C to 25 C (68 F to 77 F), with permitted excursions up to 30 C. The medicine must be protected from freezing, excessive heat, moisture, and direct light. Always store the tablets in a tightly closed container.

Security and Disposal

As a controlled substance, Lofenoxal must be stored securely and out of the reach of children to prevent accidental ingestion. For disposal, unused or expired medication should not be flushed down the toilet. Follow official regulatory guidelines by using a drug take-back program or mixing the product with an unappealing substance, such as cat litter, before sealing and discarding it.

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

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