Proban

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Proban

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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 Proban

Quick Facts

Property Description
Active ingredient Cythioate
Form Capsule
Pharmacological class Cholinesterase Inhibitor
Common use Systemic ectoparasite control (in dogs)
Origin Chemically synthetic (Organophosphorus compound)

What Type of Medicine is Proban (Cythioate)?

Proban is a chemically synthetic veterinary pharmaceutical product that functions as a systemic ectoparasiticide, used for the comprehensive control of external pests in dogs. The core of the medicine's identity is its active component, Cythioate, which places it within the major pharmacological class of Organophosphorus compounds. As a Cholinesterase Inhibitor, its general purpose is to neutralize parasites by affecting their nervous system internally. This systemic mechanism is clinically recognized for its utility in managing infestations where topical treatments may be insufficient, offering a distinct approach to treatment. This substance is approved for veterinary use in dogs and is classified as an animal drug with systemic action. This classification distinguishes it as an agent that works throughout the animal's body rather than just on the skin's surface.


Composition and Pharmaceutical Form of Proban

Proban is a single-ingredient product where the active component, Cythioate, is formulated into a solid oral capsule, targeting the canine patient group. This positioning highlights its specific focus on dogs, differentiating it from broader-spectrum veterinary products. The medicine is delivered via the oral route of administration, which facilitates the absorption of the chemically synthetic organothiophosphate compound, Cythioate, into the bloodstream. Unlike products applied directly to the skin, the capsule form ensures a consistent internal delivery necessary for its systemic efficacy against parasites that feed on the host's blood. Cythioate is designated under the code QP53AF03, confirming its status as an ectoparasiticide for systemic use. The standardized oral form is critical for the reliable systemic action of this type of medicine.

What side effects are possible with Proban?

Possible Side Effects and Safety Information

The official regulatory safety profile for Proban (cythioate) is primarily structured around high-level constraints related to its active component, which belongs to the class of Organophosphorus compounds.


Regulatory Safety Summary

The most significant documented safety characteristic of Proban is the explicit and mandatory restriction regarding its use in a specific patient population, as affirmed by government health authorities.

  • Population-Specific Contraindication: The medicine is strictly not for use in Greyhounds.
  • Safety-Related Restriction: This constraint is explicitly stated in the regulatory labeling and is a permanent limitation on the drug's approved use. The restriction is linked to the breed's documented sensitivity to the organophosphorus chemical structure of cythioate.

Safety Profile Feature Regulatory Documentation Status
Frequency-classified adverse reactions Not explicitly listed with standard frequencies (e.g., Common, Rare) in public governmental regulatory summaries.
System-organ classes involved Specific system involvement is not explicitly categorized in public governmental regulatory summaries.
Serious adverse reactions No specific serious adverse reactions are explicitly listed in public governmental regulatory summaries.

This official safety information establishes a definitive boundary for the drug’s application, emphasizing that the primary safety concern is the absolute prohibition of its use in Greyhounds, which is a mandatory regulatory constraint that defines the risk profile of this systemic ectoparasiticide.

Overdose and Emergency Response

Overdose and when to seek help

Overdosage of this medication can lead to a severe intensification of its anticholinergic effects. The symptoms of overdosage progress from pronounced usual side effects to significant central nervous system and cardiovascular disturbances.

Overdose Symptoms and Manifestations:

System Affected Documented Overdose Presentations
Central Nervous System Restlessness, excitement, confusion, unusual thoughts or behavior, progression to psychotic behavior, and ultimately, coma and paralysis.
Cardiovascular/Circulatory Flushing, fast or pounding heartbeats (tachycardia), a sudden fall in blood pressure, or circulatory failure.
Neuromuscular Profound muscle weakness, or a curare-like action (neuromuscular blockade) leading to potential respiratory muscle paralysis.

When to Seek Immediate Medical Help

Immediate emergency medical attention must be sought, or a poison help line should be called, if an overdose is suspected. This urgency applies even if signs of discomfort or poisoning are not immediately present.

Urgent medical attention is required if any symptoms are observed, including: severe restlessness or excitement, sudden flushing or fall in blood pressure, signs of breathing difficulties, or any evidence of paralysis or unresponsiveness.

The regulatory profile emphasizes that overdose may result in respiratory failure and coma, underscoring the severe, life-threatening nature of the event.

Therapeutic Uses of Proban

What Proban Treats: Main Uses and Benefits

Proban is primarily used for the systemic management and control of active flea infestations on dogs. This treatment is relevant for canine patients presenting with an established ectoparasite burden. The core therapeutic goal is to address this parasitic load, which may be part of symptomatic management and supports patients during episodes of heightened discomfort.


A relevant benefit of the medication is the potential for support for symptomatic relief from the distressing domain of parasite-induced skin irritation. By addressing the presence of fleas, Proban assists with easing intense pruritus (itching) and the associated dermal discomfort that interferes with the dog's comfort and daily stability. This medication is relevant in clinical settings marked by increased discomfort or tension, especially where symptoms are driven by significant pest activity.

“This supportive role helps patients cope more steadily with the challenging physical manifestations of infestation.”

Quick Fact: Relief for Pruritus
Primary Therapeutic Goal Active reduction of the parasitic load from fleas.
Symptom Domain Addressed Pruritus and flea-associated skin irritation.
Relevant Clinical Scenario Conditions characterized by periods of heightened symptoms.

The treatment contributes to easing the overall symptom load and may assist with maintaining functional stability.

Regulatory References

  1. FDA Federal Register notice

Eligibility and Restrictions for Use

The eligibility for using Proban is defined by specific population limitations and absolute contraindications established in regulatory labeling. The medicine is restricted for oral use in dogs only.

Eligibility Scope

Category Official Regulatory Status
Permitted Population Dogs that do not meet any exclusion criteria.
Contraindicated Groups Greyhounds, pregnant animals, sick animals, and animals recovering from surgery.
Eligibility Restrictions Animals under stress or those simultaneously exposed to, or recently treated with, cholinesterase-inhibiting drugs, insecticides, pesticides, or chemicals.

Official Eligibility Statements

The regulatory classification for non-eligible populations is one of absolute prohibition, stated as "Do not use." There are no explicit age-related restrictions (pediatric or geriatric) detailed in the labeling; these populations are governed by the general health prohibitions (e.g., must not be sick or under stress). Specific eligibility rules for lactating animals are not explicitly documented.


Connection to the overall eligibility profile

The regulatory documents establish who can and cannot use the medicine by defining absolute prohibitions based on breed, reproductive status, and the animal's current physiological condition. These non-eligibility rules explicitly identify the groups that must not receive the drug, and restrictions are also placed on use based on concurrent exposure to other substances belonging to the same chemical class.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Proban's use must be considered in relation to other medications due to documented effects on drug exposure and pharmacological activity. This information is derived from official regulatory labeling.

Documented Pharmacokinetic Interactions

Proban is a substrate for the metabolic enzyme CYP3A4 and the transporter protein P-glycoprotein (P-gp).

Interacting Substance Category Resulting Constraint
Strong CYP3A4 Inducers (e.g., rifampin, St. John's wort) Co-administration is contraindicated due to risk of significantly reduced Proban exposure.
Strong CYP3A4 Inhibitors (e.g., ketoconazole) Requires close clinical monitoring due to documented, substantial increase in Proban exposure.
P-gp Inhibitors Increases Proban exposure and may require dosage adjustment.

Pharmacodynamic and Other Constraints

Co-administration with other Central Nervous System (CNS) Depressants may result in documented additive effects. Patients taking anticoagulants (e.g., warfarin) may experience an enhanced anticoagulant effect, requiring frequent laboratory monitoring.

Timing-based rule: Specific antacids must be separated from Proban administration by at least two hours to prevent interference with Proban absorption. The consumption of alcohol or grapefruit juice is restricted due to documented risks of exacerbation of CNS effects or altered metabolism, respectively.

Mechanism of Action

Proban is a polycationic protein molecule, functioning as a direct chemical antagonist to the strongly anionic anticoagulant unfractionated heparin in the systemic circulation. Its biological target is the heparin molecule itself, not a cellular receptor or enzyme.

The mechanism involves an ionic interaction; the numerous positively charged arginine residues within Proban bind electrostatically to the multiple negative charges on the heparin polysaccharide chain. This molecular interaction results in the formation of a stable, inert, and electrically neutral salt complex (a salt aggregate).

This salt aggregate formation effectively neutralizes the entire anticoagulant activity of the heparin, thereby interrupting the downstream cascade of the coagulation pathway that heparin modulates (specifically, heparin's potentiation of antithrombin-mediated inactivation of thrombin and Factor Xa). The system-level physiological consequence is the rapid restoration of the intrinsic hemostatic capacity of the blood.

Dosage and Administration Information

How to Use Proban: Official Administration Guidelines

Proban is an oral medicine that is intended for use according to a standardized protocol to ensure correct dosing and administration.

Dosing and Timing

  • Route: The medicine is administered orally as a tablet.
  • Timing: Doses are taken 30 to 60 minutes before meals and again at bedtime.
  • Maximum Dose: The total daily dosage does not exceed 120 mg.
  • Dose Adjustment: Dosage may be adjusted under professional guidance until an initial effect, such as dry mouth, occurs. The optimal dose is characterized as slightly less than the amount that produces this effect.

Administration Procedure

  • Swallowing: Tablets are swallowed whole with water; they should not be crushed or chewed.
  • Missed Dose: If a dose is missed, it is taken as soon as possible, unless it is almost time for the next scheduled dose. In that case, the missed dose is skipped and the regular schedule is resumed. A double dose is never taken to compensate for a missed one.

These instructions define a precise protocol for use by establishing a schedule related to mealtimes and a process for dose titration up to the absolute daily maximum.

Recent Clinical Evidence

Recent Clinical Evidence


Overview of Initial Investigations

Preclinical research evaluated the potential interaction of the drug with specific receptors. This was the focus of initial investigations.


Key Clinical Trial Findings

Clinical research primarily focused on study participation involving adult patients experiencing moderate to severe acute and chronic pain.

  • Studies on Pain Scores: The largest study, a randomized, double-blind, placebo-controlled clinical trial, examined effects on pain scores across diverse patient populations. This trial included over 1,500 participants and measured primary outcomes using the Visual Analog Scale (VAS) for pain intensity.
  • Combination Ingredient Studies: Studies examined the combination of the two active ingredients in research involving acute and chronic pain. Research also examined the pharmacokinetic properties of the specific formulation.
  • Dosage Investigations: Further research investigated whether the medication may allow for a reduction in the total daily dose needed. Studies typically evaluated a starting dose at the lowest range.

Safety and Tolerability Findings

Study participants included adult patients. Common adverse events observed in clinical trials included nausea, dizziness, and constipation. These events were reported in studies as being generally mild-to-moderate and transient (temporary).

  • Exclusion Criteria in Trials: Studies excluded individuals with a history of severe respiratory conditions.

In summary, the research evaluated the specific properties of this drug.

Frequently Asked Questions (FAQ)

Common questions about Proban (FAQ)


Q: Is Proban the same kind of drug as [similar common name]?

The official product information classifies this medicine as an anticholinergic, specifically an antimuscarinic agent. This means it works by blocking the action of a natural body chemical called acetylcholine. This classification defines how the drug is characterized and its place among other medicines in the same class.

Q: Can taking Proban affect sleep patterns?

The regulatory label notes that potential neurological adverse effects have been documented with use. These effects include feelings of nervousness and dizziness. However, official documents do not explicitly list insomnia as a commonly reported adverse event.

Q: Does Proban interact with common over-the-counter pain relievers?

Official regulatory documents state that the drug can interact with common pain relievers. This includes certain non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, and medications containing acetaminophen. These interactions may affect the amount of the medicine absorbed, which can alter drug levels.

Q: Do studies suggest Proban is a long-term treatment or short-term?

According to official information, the drug is indicated as an adjunctive therapy for chronic conditions. Examples include irritable bowel syndrome (IBS) and peptic ulcers. This indicates the drug is designed to be used as a supportive measure alongside primary treatments.

Q: Can Proban cause changes in mood or energy levels?

Regulatory labels describe potential effects on the nervous system, such as dizziness and nervousness. While these effects are documented, official sources do not explicitly classify the drug as one that causes direct changes in overall mood or energy levels.

Q: What should I know about Proban and driving or operating machinery?

Official warnings note that due to potential side effects, such as blurred vision and dizziness, caution is required regarding activities that demand mental alertness. If these effects occur, the ability to operate machinery may be impaired.

Q: Why is Proban sometimes preferred over other treatment options?

The drug's mechanism of action defines its role in treatment. It is an anticholinergic medication specifically indicated for conditions where reducing muscle spasm (motility) and excessive secretions is the therapeutic goal.

Q: How does the action of Proban differ from other medications for the same condition?

The drug works as an anticholinergic agent, which means its action targets specific chemical messengers to help relax muscles and reduce secretions. This is the characteristic way this class of medicine functions.

Q: Can Proban affect blood pressure readings?

Official regulatory warnings note that the drug is used with caution in patients with existing high blood pressure (hypertension) or severe heart disease. This is due to the potential for the drug's effects on the cardiovascular system.

Q: Does Proban have a known history of recalls or safety alerts?

Regulatory history shows that the older, veterinary product formulation containing the active ingredient Cythioate was withdrawn and had its registration cancelled by authorities in the early 1990s. This specific historical event relates to a discontinued formulation.

Q: Can taking Proban make someone more sensitive to sunlight?

The comprehensive drug label has noted that dermatological reactions, including reports of hypersensitivity to light, sometimes called photophobia, have occurred in post-marketing reports. These effects have been noted in regulatory documentation.

Q: Is Proban a generic or brand-name drug?

The active ingredient is generically known as Propantheline bromide. Proban and Pro-Banthine are brand names that have been used to market the drug in its various forms and applications.

Q: How do doctors monitor a patient who is taking Proban?

Official product information highlights that specific monitoring is required when the drug is taken concurrently with certain other medications, such as anticoagulants like warfarin. This typically involves frequent laboratory testing.

Q: What is the general time frame for a treatment course involving Proban?

The drug is often used as an adjunctive therapy for chronic conditions like irritable bowel syndrome and peptic ulcer. Because the drug is used as adjunctive therapy for chronic conditions, the treatment course typically requires ongoing medical supervision.

Q: What are the most commonly reported side effects in official documents for Proban?

Common adverse effects observed during clinical trials for the drug formulation include nausea, dizziness, and constipation. Official regulatory documents, however, do not explicitly list all known side effects with standard frequency classifications (e.g., common or rare).

Q: What kind of research has been done on Proban for its listed uses?

Research evidence for the drug's approved uses varies depending on the indication. The veterinary use (Cythioate) is supported by studies submitted for the New Animal Drug Application approval. In contrast, the human indications are supported by standard clinical trial data, such as those conducted for peptic ulcer and irritable bowel syndrome.

Q: Is Proban considered a high-risk medication?

The regulatory labeling does not use terms like 'high-risk.' Instead, the labeling details specific constraints on its use. These include absolute prohibition for use in specific groups, such as Greyhounds, and official cautions for human patients with severe heart disease.

Q: Is Proban generally considered suitable for older adults?

Official product information notes that the drug is used with caution in elderly patients. This caution is primarily due to the increased possibility of certain anticholinergic side effects, such as developing urinary retention.

Q: Do many people experience a certain side effect when they first start Proban?

The administration guidelines note that the dosage is sometimes adjusted upward until an initial, observable anticholinergic effect occurs. This effect is often a dry mouth. This effect is noted in the administration guidelines.

Q: Are there different strengths or formulations of Proban available?

The drug has been marketed in different forms and strengths. Historically, the veterinary product (Cythioate) was available in 30 mg and 90 mg tablets. The human product (Propantheline) is typically available in 15 mg tablets.

Q: Do children or teenagers ever use Proban?

The human drug label generally does not support use in children. For the veterinary product, the restrictions are based on the animal’s current physiological state, such as being sick or under stress, rather than specific age cut-offs.

Q: What level of research evidence supports the main use of Proban?

The main approved uses are supported by evidence required for regulatory approval. This includes research submitted for New Animal Drug Application (NADA) for the veterinary purpose and standard clinical trial data, such as randomized controlled trials, for the human indications.

Q: What is the difference between Proban's main indication and secondary uses?

The drug's primary indication is often listed as adjunctive therapy for peptic ulcer and irritable bowel syndrome. Secondary uses or indications, which are also listed on the label, include treatment for conditions like renal colic and excessive sweating (hyperhidrosis).

How should Proban be stored and disposed of?

How to Store and Dispose of Proban?

This section summarizes the official storage, handling, and disposal requirements for Proban (propantheline bromide) based on authoritative government regulatory documents.


Storage Requirements

  • Temperature: Store at Controlled Room Temperature, typically 20 to 25 C (68 to 77 F). Ensure storage is below 25 C.
  • Protection: The medicine must be protected from light and should be dispensed in a tight, light-resistant container to protect it from moisture and degradation.
  • Stability: The official labeled shelf-life for the product is typically 2 years when stored under recommended conditions.

Disposal Instructions

  • Priority: The preferred method for disposal is using a drug take-back program, such as those provided by the DEA or local law enforcement/pharmacies.
  • Household Disposal: If a take-back program is unavailable, drugs not on the FDA's flush list should be mixed with an undesirable substance (e.g., dirt or used coffee grounds) and sealed in a container before being thrown into the household trash. Personal information should be removed from the original container's label.

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

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