Dosalid

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Dosalid

Method of action: Anthelmintic

Treatment option:

Medically reviewed

Laura Arias

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 Dosalid

Property Description
Active Ingredients Epsiprantel and Pyrantel (as Pyrantel embonate)
Form Oral Tablet (Comprimidos)
Pharmacological Class Anthelmintic (Antiparasitic agent)
Type Fixed-Dose Combination
Origin Synthetic

Dosalid is formally classified as a veterinary medicinal product (VMP) intended for use in animals, primarily dogs and cats, belonging to the anthelmintic pharmacological class. This synthetic agent is prepared as an oral tablet and functions as an antiparasitic agent specifically targeting internal worm infestations. The general purpose of this medicine is the elimination or expulsion of certain parasitic organisms, providing comprehensive internal parasite management.


What Type of Medicine is Dosalid?

Dosalid is a synthetic veterinary medicinal product belonging to the anthelmintic drug class, specializing in the management of parasitic worm infestations. Dosalid is intended for oral use in the target species. The anthelmintic class is recognized for its activity against these internal parasites. Unlike general antiparasitic agents that might address external parasites, anthelmintics like Dosalid concentrate their action against helminths within the host's body. This specific classification defines the product's scope, indicating it is a specialized, regulated treatment for addressing common intestinal worm issues in dogs and cats.


Dosalid's Fixed-Dose Combination: Core Composition

Dosalid is characterized as a fixed-dose combination product because it contains two distinct, chemically active synthetic ingredients: Epsiprantel and Pyrantel, typically formulated as Pyrantel embonate. This preparation is delivered as an oral tablet designed for oral administration in the target species. This dual composition integrates Epsiprantel, which is effective against cestodes (tapeworms), with Pyrantel embonate, which targets nematodes (roundworms and hookworms). The pyrantel component has recognized efficacy against common nematode infections, including roundworms. The use of a fixed-dose combination means both compounds are delivered in a single oral tablet, a strategy designed to provide simultaneous activity against a broad-spectrum of common intestinal parasites.


What is the General Purpose of Dosalid?

The general purpose of Dosalid is to provide a comprehensive solution for the expulsion or elimination of a wide range of common internal parasitic worms in animals. This combination strategy is intentionally implemented to offer broad-spectrum antiparasitic coverage against both tapeworms and roundworms/hookworms in one treatment, which is a key differentiator from single-active-ingredient products. A common, neutral use scenario is the routine annual or semi-annual parasite control program recommended by veterinarians. The medicine's design focuses on achieving an efficient, localized anthelmintic action primarily within the host's gastrointestinal tract, promoting swift parasite clearance.

Regulatory References

  1. WHO Model List of Essential Medicines

What side effects are possible with Dosalid?

Possible Side Effects and Safety Information

Dosalid is a combination veterinary medicinal product containing two active anthelmintic agents, Epsiprantel and Pyrantel embonate, and is formulated exclusively for use in its target species (dogs). This classification means all safety information and restrictions are governed by veterinary medicine regulations.

Adverse Reactions

Side effects associated with this class of anthelmintics, specifically Pyrantel, are generally rare when the product is administered according to the official label instructions. The adverse reactions most frequently documented are those related to the gastrointestinal system, including vomiting, diarrhea, and lack of appetite.

Epsiprantel, the other component, is known to have an excellent margin of safety with reports of adverse reactions, such as vomiting, being rare in dogs. The product is also restricted to oral use.

Safety Considerations and Limitations

  • Prescription Status: Dosalid is formally classified as a Veterinary medicinal product subject to veterinary prescription. Its use is legally restricted to being dispensed and administered under the authority and supervision of a licensed veterinarian.
  • Target Population: All documented safety and efficacy data relate only to its use in the Target species: Dog.
  • Interactions: Caution is advised against the concurrent use of Pyrantel with certain other deworming agents, such as piperazine, due to potential pharmacological antagonism. The prescribing veterinarian accounts for all potential interactions.
  • Serious Reactions: As with any medicinal product, the possibility of a serious adverse drug reaction or hypersensitivity is not excluded, and these events must be reported to the relevant regulatory authority. Overdoses of pyrantel, though minimally absorbed, may lead to systemic signs if severe.

Due to its use strictly in the veterinary context, the comprehensive safety dossier is primarily for the guidance of prescribing professionals who manage and monitor the risk profile for the individual animal.

Overdose and Emergency Response

Overdose Manifestations and Safety Margin

Official regulatory documents indicate that the active components of Dosalid have a high margin of safety. Clinical signs of overdose are generally documented only at dose levels significantly exceeding the recommended therapeutic range, such as 18 times to 90 times the normal dosage. These documented signs of intolerance, which typically appear at extreme exposures, may include vomiting (emesis) and trembling (muscle tremors), affecting the gastrointestinal and central nervous systems, respectively. The regulatory basis confirms no significant adverse results were reported at a very high multiple of the therapeutic dose.


When to Seek Urgent Help and Management

The regulatory profile strictly mandates immediate action upon exposure or suspicion of overdose. Since there is no known specific antidote for the active components, management focuses entirely on supportive care.

  • Suspected Animal Overdose: It is required to immediately contact a veterinarian or an emergency veterinary facility if an animal is suspected of receiving an overdose.
  • Accidental Human Ingestion: Immediate medical advice must be sought for accidental oral uptake by a human.
  • Supportive Management: Treatment is symptomatic and supportive to manage any documented clinical manifestations. Regulatory guidance notes that the use of activated charcoal may be beneficial following accidental oral uptake as part of the management plan.

Therapeutic Uses of Dosalid

What Dosalid Treats: Main Uses and Benefits

The medication is applied across therapeutic domains where additional symptomatic support is needed for managing internal parasitic burdens. Dosalid is commonly used for the therapeutic management of mixed endoparasite infections—conditions involving both tapeworms (cestodes) and roundworms/hookworms (nematodes)—within the gastrointestinal tract. This broad-spectrum activity contributes to easing the overall symptom load by addressing multiple parasite categories.


Key Therapeutic Focus

The medication is relevant for managing symptom clusters that may become intense or disruptive, helping address the parasitic burden of common species. The primary therapeutic domains include the management of infections involving cestodes such as Dipylidium caninum and Taenia species, as well as high-risk nematodes like Toxocara canis and Ancylostoma caninum. Addressing these specific parasites is considered relevant in clinical settings; this application supports general well-being during symptomatic phases and helps with managing symptoms related to inflammatory or irritative states. It is relevant in situations requiring short-term therapeutic assistance as part of an ongoing routine parasite control program. This application is considered relevant for vulnerable patient groups like puppies and nursing animals.


Quick Fact: Supportive Management for Parasitic Burden
This combination product may assist with managing gastrointestinal discomfort associated with the presence of both tapeworms and roundworms, supporting patients during episodes of heightened physiological strain.

Regulatory References

  1. FDA-Approved Drug Label for Epsiprantel

Eligibility and Restrictions for Use

The official eligibility profile for the veterinary medicine Dosalid (Epsiprantel/Pyrantel) is defined by regulatory limitations regarding age, reproductive status, and known hypersensitivity to its active components. This information is derived strictly from government regulatory documentation.

Eligibility and Restrictions

Populations Allowed: Dosalid is permitted for use in the target species, dogs and cats, provided they have reached the age of seven (7) weeks or older.

Populations Who Must Not Use Dosalid (Contraindications): Use is strictly contraindicated in puppies and kittens less than seven (7) weeks of age ( < 7 weeks). The medicine must also not be administered to animals with a known hypersensitivity or allergy to either Epsiprantel or Pyrantel or any excipients in the tablet formulation.

Restricted Use Populations: Official labeling establishes a restriction for use in pregnant animals and breeding animals. Regulatory documents state that the safety of the medicine has not been determined in these populations, which defines their eligibility status as conditional. No specific absolute contraindications related to severe renal or hepatic impairment are formally documented in the official prescribing information for the active components.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documentation for Dosalid, which contains the active ingredients Pyrantel embonate and Epsiprantel, explicitly describes certain required restrictions and interaction patterns. The profile is primarily defined by pharmacodynamic constraints and potential modifications to the plasma concentration of co-administered substances.

Documented Pharmacodynamic and Combination Constraints

Co-administration with Piperazine compounds is formally documented as a contraindicated combination in regulatory labeling. This restriction is necessary because the combination results in pharmacodynamic antagonism, which directly reduces the anthelmintic efficacy of the Pyrantel component. Furthermore, due to Pyrantel’s effects as a cholinergic agonist, concurrent use with other cholinergic compounds can lead to an elevated risk of additive toxicity.

Exposure Modification and Administration Context

The Pyrantel component has been documented to cause an increase in the plasma levels of Theophylline. Conversely, the regulatory data for Epsiprantel noted no drug incompatibilities during concurrent use with substances such as Diethylcarbamazine citrate in clinical field studies.

Regulatory labeling contains no mandatory timing or separation requirements that necessitate administering this medicine at specific intervals from other agents. Additionally, no special dietary measures or fasting rules are required, indicating the absence of a restrictive food interaction.

Mechanism of Action

How Dosalid Works: Mechanism of Action


Parasitic Neuromuscular Disruption

Dosalid contains Pyrantel, which acts as an agonist on the Nicotinic Acetylcholine Receptors (nAchRs) of susceptible nematodes (roundworms and hookworms). This interaction forces the worms' muscles into continuous depolarization, leading to an irreversible state of spastic paralysis. This physiological failure prevents the parasites from maintaining their hold, preceding their expulsion from the gastrointestinal tract by host peristalsis.


Compromising Cestode Structural Integrity

The second component, Epsiprantel, targets the structural integrity of cestodes (tapeworms) by rapidly disrupting their protective outer layer, the tegument. This physical compromise causes the tapeworms to lose vital fluids and metabolites, resulting in the swift collapse and death of the parasite. This mechanism causes the local elimination of tapeworms via a pathway distinct from the neuromuscular effects on roundworms.


Complementary Localized Action

The fixed combination is designed to deliver two different, locally acting mechanisms: one targeting the neuromuscular pathway in nematodes and the other targeting the structural integrity of cestodes. Since both agents have minimal host absorption, the mechanisms are concentrated in the intestine, allowing the drug to address the two different mechanistic pathways associated with both major parasite subclasses.

Dosage and Administration Information

How Dosalid is Used

Dosalid is a veterinary medicinal product that is administered exclusively by the oral route using a tablet formulation. The administration protocol is designed for broad-spectrum management of internal parasitic burdens, and the instructions for use focus on proper dosing and scheduling to maintain control.


Official Dosing and Frequency

The dosage is strictly dependent on the animal's body weight to ensure therapeutic levels of both active ingredients. The officially designated therapeutic instruction is for a single-dose treatment delivering a total of 10.5 mg of combined active ingredient per kilogram (kg) of body weight. This total dose is composed of 5.5 mg/kg of Epsiprantel and 5.0 mg/kg of Pyrantel (as embonate).


Usage Pattern Administration Frequency
Routine Adult Maintenance Typically biannual (twice-yearly), or monthly in high-risk scenarios.
Puppies Dosing begins between 2 and 4 weeks of age, followed by monthly intervals until 6 months.
Severe Infection Repeated administration over 2 to 3 consecutive days may be specified for severe Toxocara canis infection.

Administration Conditions and Constraints

The oral tablet does not require fasting; the official instruction specifies that the drug should be given without the necessity of withholding food.

For certain parasitic infections, such as those involving Dipylidium caninum, the use of the medicine is contextually linked to the management of the intermediate host. The official labeling emphasizes that an effective flea control program must be instituted to prevent rapid reinfection following treatment, which is a necessary procedural constraint.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Dosalid

Dosalid is a fixed-dose combination product that has been studied within the veterinary regulatory framework. Research has been conducted to evaluate its use in the management of common internal parasite burdens. The available evidence primarily comes from controlled efficacy trials, field studies, and regulatory reviews that focus on measuring parasite clearance rather than long-term clinical health outcomes. This overview details the scope and limitations of the published and regulatory-reviewed research.


Evidence for Use in Mixed Endoparasite Infections

Research has explored Dosalid's function in animals with mixed endoparasite infections. These research efforts primarily examined a specific outcome: the Parasite Clearance Rate, measured by laboratory techniques. The combination reported measurements of parasite clearance consistent with regulatory standards within the short observation period of the study.

It is important to note that this evidence is specific to the veterinary context and focuses overwhelmingly on short-term clearance. The follow-up durations were limited, and data for long-term outcomes are not fully established in the primary regulatory evidence.


Evidence for Specific Cestode (Tapeworm) Infections

Research has specifically examined the role of the Epsiprantel component against major cestode infections. Studies documented patterns indicating clearance measurements consistent with regulatory requirements against the targeted tapeworms. Studies also documented that the physical shedding of tapeworm segments was monitored and observed to cease within the short time frame following administration.

Limited information for long-term outcomes exists regarding how soon re-infection may occur. Additionally, research is ongoing to monitor regional variations, as localized reports of the potential for parasite resistance to this drug class have been observed in some studies.


What is Still Uncertain About Dosalid Research

While the research provides sufficient evidence for regulatory authorization, several areas remain the subject of ongoing scientific inquiry:

  • Whipworm Efficacy: Findings were mixed regarding the effectiveness against certain parasites, specifically whipworm (Trichuris vulpis), where efficacy may be lower than for other nematodes.
  • Symptom Measures: The research provides limited insight into long-term quality-of-life outcomes, as symptomatic relief was recorded as a non-standardized, secondary observation in the studies.
  • Long-term Effects: Limited information for long-term outcomes means that the durability of parasite clearance and the long-term health metrics beyond the 3–4 week study window are not fully characterized.

Key Studies & References Cestex® (epsiprantel) - FDA Approved Drug Label (Cestode component evidence)

Frequently Asked Questions (FAQ)

Common questions about Dosalid (FAQ)

Q: How long does it typically take to start feeling the effects of Dosalid?

A: According to the official product information, the medicine is intended for swift parasite clearance in the digestive tract. Official information indicates the active ingredients begin working immediately upon local exposure within the digestive tract. While specific time-to-clearance varies, the overall therapeutic goal is achieved within a short time frame, as indicated in efficacy trials.

Q: Can Dosalid cause weight gain or weight loss?

A: Regulatory documents list the product’s most frequently reported adverse effects, which are primarily related to the gastrointestinal system, such as vomiting, diarrhea, and lack of appetite. Weight changes are not explicitly listed as a common or specific adverse reaction in the official safety profile for the product.

Q: Is it common to feel tired or dizzy while on Dosalid?

A: Official information for the active ingredient Pyrantel indicates that dizziness and fatigue have been associated with it as potential systemic side effects. However, these are not the effects listed as most frequently reported in the VMP product's official safety profile.

Q: Does Dosalid have a black box warning?

A: Dosalid is categorized as a Veterinary Medicinal Product (VMP) intended for use in animals. The product is regulated as a VMP, and an equivalent U.S. FDA Boxed Warning (Black Box Warning) is not present in its official safety profiles.

Q: What is the guidance for using Dosalid while breastfeeding?

A: Official regulatory documents state that the safety of the medicine has not been determined in lactating (breastfeeding or nursing) animals. Therefore, its use in this population is restricted or conditioned, and the prescribing veterinarian is responsible for assessing its use.

Q: Do I need a special blood test before starting Dosalid?

A: Official labeling does not mandate specific blood tests be performed before administration for routine use. However, the product information does advise caution in animals with existing liver or kidney impairment, which the prescribing veterinarian is responsible for assessing prior to use.

Q: Why are there different strengths of Dosalid available?

A: The official product information indicates the dosage must be adjusted based strictly on the animal’s body weight. Different strengths help ensure the appropriate dose is delivered across a range of weights, according to the therapeutic instructions.

Q: Where can I find the official prescribing information for Dosalid?

A: The definitive, official prescribing information for Dosalid is contained within the Summary of Product Characteristics (SmPC). This document, along with other official regulatory data, can be found by searching the relevant country’s regulatory database, such as the European Medicines Agency (EMA).

Q: Can Dosalid be taken with supplements like vitamins or herbal remedies?

A: Official regulatory documents provide specific warnings about known drug-drug interactions with other prescription medicines. However, the label does not typically address every possible supplement or herbal remedy. Therefore, any co-administered substances should be managed and reviewed by the prescribing professional.

Q: What is the half-life of Dosalid?

A: The drug is designed for localized action within the intestine. The Pyrantel component exhibits minimal host absorption, meaning most of the active substance is not absorbed into the bloodstream. The unabsorbed fraction is primarily eliminated via faeces; minimal absorption means that an explicit, systemic half-life value is not the primary focus of the regulatory profile.

Q: Is there a specific time of day recommended for taking Dosalid?

A: Official instructions specify that the medicine does not require withholding food for administration. The regulatory documents do not recommend or mandate a specific time of day (such as morning or evening) for the product to be administered.

Q: Is Dosalid related to or in the same drug class as [Drug X]?

A: Dosalid is classified by regulatory authorities as a fixed-dose combination product belonging to the anthelmintic (antiparasitic) pharmacological class. Anthelmintics are specialized agents used to treat internal parasitic worm infestations.

Q: Can Dosalid cause headaches?

A: Official information for the Pyrantel component indicates that general systemic adverse effects, including headache, have been associated with its use in general pharmacological information. However, this is not one of the more frequently documented adverse reactions listed for the VMP product itself.

Q: Does Dosalid contain lactose or gluten?

A: The official product documentation, specifically the Summary of Product Characteristics (SmPC), includes a comprehensive list of all inactive ingredients (excipients). This regulatory document would explicitly confirm the presence or absence of specific fillers like lactose or gluten.

Q: Does Dosalid treat chronic conditions or just short-term issues?

A: The official administration schedule covers its use both for routine maintenance (suggesting long-term parasite management) and as a single-dose treatment for clearance (a short-term issue). The research, however, focuses overwhelmingly on short-term clearance rates of the parasites.

Q: What happens if I stop taking Dosalid suddenly?

A: The product is designed primarily as a single-dose treatment for clearance. For certain parasitic infections like Dipylidium caninum, the official label emphasizes that an effective flea control program must be instituted to prevent rapid reinfection following treatment, highlighting the need for a comprehensive management strategy.

Q: Is Dosalid safe to take with common over-the-counter pain medications?

A: Regulatory documents provide mandatory warnings about specific contraindicated and cautionary interactions with certain prescription drugs. However, the label does not exhaustively list all possible over-the-counter pain medications; therefore, review of all co-administered substances is managed by the prescribing veterinarian.

Q: Can I drink alcohol while I am using Dosalid?

A: As a Veterinary Medicinal Product (VMP) approved only for use in dogs and cats, the product information does not address human alcohol consumption.

Q: Is Dosalid safe for older adults (seniors)?

A: The official regulatory documents provide a lower age limit for use in young animals. The documents indicate no upper age restriction for geriatric animals, and general use depends on the absence of other contraindications.

Q: Does Dosalid lose its effectiveness over time?

A: Regulatory labeling specifies the limited shelf life for a halved tablet. Furthermore, official warnings note that parasite resistance is a regulatory consideration for the efficacy of this drug class.

Q: Is Dosalid physically addictive or habit-forming?

A: Dosalid is classified as an anthelmintic (antiparasitic) VMP. This drug class is not associated with psychoactive effects, and official product information does not indicate that this drug class carries the risk of physical addiction or habit formation.

Q: What does the term '[Dosalid-specific medical jargon]' mean in the patient leaflet?

A: The product documentation defines the drug’s Mechanism of Action, including terms that describe how the active ingredients target the worms, such as disrupting the tegument (the worm's outer skin) or affecting the Nicotinic Acetylcholine Receptors on the parasite's muscles.

Q: Why does the official document list so many possible side effects?

A: Regulatory documents are required to provide a comprehensive list of all adverse effects observed during clinical trials, post-market surveillance, and those associated with the drug class. This practice ensures completeness, even if many listed effects are rare or of unknown frequency.

Q: Why do some people experience stomach upset with Dosalid?

A: Official information describes the drug as having localized action within the host’s intestine and minimal systemic absorption. Due to this, any potential side effects are typically focused on the gastrointestinal system, resulting in the commonly reported effects like vomiting and diarrhea.

Q: Is there a maximum time someone is advised to use Dosalid?

A: The official instructions define the administration schedule for routine maintenance (e.g., biannual, monthly) and for short-term courses (e.g., 2–3 consecutive days). There is no stated absolute maximum duration for repeated treatment provided in the regulatory labeling.

Q: What are the signs of a serious allergic reaction to Dosalid?

A: Official labeling contraindicates the drug in cases of known hypersensitivity (severe allergy). While the documents advise veterinary intervention for any serious adverse event, they do not list the specific symptoms of a severe reaction. Immediate attention is advised if any unusual or severe reaction is suspected.

Q: How does Dosalid get eliminated from the body?

A: As a highly localized agent with minimal systemic absorption, the majority of the drug and its related compounds are not processed by the body’s main elimination organs. The drug is primarily eliminated via faeces, with only a small, absorbed fraction being eliminated via urine.

Q: Does Dosalid affect liver or kidney function?

A: The regulatory labeling notes that the safety of the drug has not been formally determined in animals with severe renal or hepatic impairment. This absence of data indicates caution is required when the product is used in these specific animals.

Q: What should I do if I think Dosalid isn't working for me?

A: Dosalid is classified as a Veterinary Medicinal Product that requires a prescription. The prescribing veterinarian is the appropriate contact for the management of suspected lack of efficacy, diagnosis, and treatment adjustments.

How should Dosalid be stored and disposed of?

How to Store and Dispose of Dosalid?

The official regulatory profile for Dosalid defines specific requirements for storage, stability, and disposal to maintain the quality of the veterinary medicinal product.

Storage and Handling

Requirement Regulatory Specification
Temperature Store below 25 C.
Protection Store in the original package to protect from light and moisture.
Child Safety Must be kept out of the sight and reach of children and stored out of the reach of animals.
Divided Tablets Halved tablets must be used within 2 days (48 hours) when returned to the open blister.

Disposal

Unused or expired Dosalid must not be disposed of via wastewater or household refuse. The product and any waste materials must be disposed of in accordance with local environmental requirements for pharmaceutical products.

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

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