Tylan

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Tylan

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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 Tylan

The commercial preparation Tylan is a medication used exclusively in veterinary medicine. Its active component is the substance Tylosin, which is fundamentally classified as a macrolide antibiotic.

Property Description
Active ingredient Tylosin (as salt forms, e.g., Tartrate/Phosphate)
Form Injectable solution, Soluble powder, Premix (feed additive)
Pharmacological class Macrolide antibiotic
Common use Control of susceptible bacterial infections (e.g., Mycoplasma)
Origin Natural (Fermentation product of Streptomyces fradiae)

What Type of Medicine is Tylan (Tylosin)?

The core entity, Tylosin, is classified as a macrolide antibiotic, a substance produced biologically through the fermentation of the soil microorganism Streptomyces fradiae. It functions as a bacteriostatic agent, meaning its primary mode of action is to inhibit the growth and replication of bacteria rather than directly eliminating the cells outright. Tylan is clinically recognized for its crucial role in veterinary medicine, where its unique spectrum, particularly its efficacy against Mycoplasma species, makes it a preferred option for associated respiratory diseases.


Composition and Physical Forms of the Tylosin Active Ingredient

The substance Tylosin is a complex mixture predominantly composed of Tylosin A, the main active component, and is frequently presented as a stabilized salt, such as Tylosin Tartrate or Tylosin Phosphate, to enhance its usability. This single-active-ingredient product is manufactured into specialized dosage forms for various veterinary practices, including an injectable solution for rapid systemic delivery, a soluble powder intended for mixing into drinking water, and a premix designed for incorporation into animal feed. This wide array of administration forms is a key differentiating factor.


General Purpose: How Tylosin Controls Bacterial Issues

The general purpose of administering Tylan is the effective management and control of bacterial infections caused by susceptible microorganisms. By interfering with the internal protein synthesis machinery of the bacterial cell, the drug's bacteriostatic action limits the pathogen's ability to proliferate. A typical use scenario involves treating respiratory infections in poultry and swine, leveraging the drug's targeted effectiveness against specific pathogens commonly involved in herd health challenges.

What side effects are possible with Tylan?

Possible Side Effects and Safety Information

The safety profile of the veterinary macrolide antibiotic Tylan (Tylosin) is based strictly on data from government regulatory authorities, detailing adverse reactions and mandatory limitations. Adverse effects are classified by frequency and body system.

Documented Adverse Reactions and Frequencies

Adverse reactions are documented across several System-Organ Classes, primarily involving Gastrointestinal Disorders (diarrhea, vomiting, anorexia) and General Disorders (injection site pain/swelling). In pigs and cattle, the European regulatory framework classifies certain events:

  • Uncommon: Hypersensitivity reaction.
  • Very Rare: Anaphylactic shock, death, anal prolapse, and rectal edema in swine.

Serious Safety Restrictions

Official labeling mandates critical restrictions for safe use:

  • Contraindication for Equine Species: Tylan is strictly forbidden for use in horses and other equine species due to the risk of severe, potentially fatal diarrhea.
  • Hypersensitivity Contraindication: Use is prohibited in any animal with a known allergy to Tylosin or other macrolide antibiotics.
  • Public Health Constraint: A mandatory Withdrawal Period must be observed between the last drug administration and the use of the animal's products (meat or milk) for human consumption. This period varies by formulation and species.

Population-Specific Safety Notes

The most common adverse effects, such as vomiting and diarrhea, are frequently documented in dogs. Swine are noted for specific reactions like rectal edema. Safety during animal pregnancy or lactation is generally not established and requires a formal benefit-risk assessment.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Tylosin (Tylan) overdose describes specific, serious risks that are dependent on the animal species and dosage. Over-exposure is associated with severe outcomes, including shock and death in baby pigs; consequently, regulators mandate strict adherence to weight-based administration in this population. Administration by injection to equines has been fatal, constituting a major population-specific toxicity risk.

Documented Overdose Manifestations

Species Documented Clinical Signs
Swine Edema of the rectal mucosa, anal protrusion, erythema, pruritus
Cattle (High Dose) Depression, dyspnea (difficulty breathing)

Required Emergency Actions

Seek immediate emergency veterinary care and contact an animal-specific poison control center if over-exposure is suspected. Regulatory documentation notes that no specific antidote is known for Tylosin overdose. Management is limited to symptomatic and supportive treatment, typically involving the discontinuation of the drug.

Therapeutic Uses of Tylan

What Tylan Treats: Main Uses and Benefits

Tylan is commonly used across therapeutic domains involving specific symptoms in livestock and poultry. The medication is used to help manage symptoms of bacterial infections that include respiratory diseases (like Chronic Respiratory Disease, or CRD), severe gastrointestinal inflammation (such as Swine Dysentery and Ileitis), and localized infections (including Mastitis and Metritis).

The medication is relevant in clinical settings that involve acute or unstable symptom patterns, and is often used during phases when symptoms become more noticeable.

“Tylan assists with managing acute symptoms associated with specific bacterial infections across multiple physiological systems.”

Quick Fact: Symptom Management

Quick Fact: Tylan is used for managing symptoms that create noticeable physiological strain from conditions like CRD, Swine Dysentery, and acute Mastitis. The support provided may assist with managing localized physical discomfort and swelling, which can contribute to easing the overall symptom load during periods of heightened symptoms. It supports patients during difficult episodes by easing distress and is also applied in settings where short-term symptom stabilization is important, such as during animal transport.

Regulatory References

  1. U.S. Food and Drug Administration (FDA) approved label information

Eligibility and Restrictions for Use

Who Can and Cannot Use Tylan?

As a veterinary macrolide antibiotic (Tylosin), the eligibility for Tylan is defined by animal species and production status, strictly according to regulatory labeling. Eligibility is not determined by human age groups or organ function, but by the animal's physical characteristics and role in the food supply.


Official Eligibility Rules

Classification Population Rule (Regulatory Basis)
Populations Allowed Swine, Beef Cattle, Nonlactating Dairy Cattle, Chickens, Turkeys, and Honey Bees (for specific uses).
Absolute Contraindications Horses or other Equine Species (injection is prohibited and reported as fatal). Lactating Dairy Cattle and Laying Hens producing eggs for human consumption.
Condition/Weight Restrictions Animals with known hypersensitivity to Tylosin or other macrolides. Pigs weighing less than 25 pounds for the 200 mg/mL injectable product. Calves intended for veal production.

Eligibility is primarily restricted by the risk of species-specific toxicity and the mandated avoidance of drug residues in the human food chain. These rules are non-negotiable and based on government-approved labeling.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documentation for Tylan (Tylosin) records specific interaction patterns, primarily focusing on co-formulation restrictions and documented pharmacokinetic and pharmacodynamic outcomes with other medicines.

Documented Interaction Patterns

Classification Interacting Entity / Outcome
Administration Incompatibility Restriction Bentonite (Prohibited in feed above 2% concentration) and Sodium Metabisulfite (Prohibited in liquid feed).
Pharmacodynamic Antagonism Co-administration with Chloramphenicol or Lincosamides may result in reduced efficacy.
Pharmacokinetic Exposure Modification Co-administration with Digitalis may lead to increased blood concentrations of Digitalis, a significant formal interaction outcome.
Procedural Constraint The injectable solution must not be mixed with other solutions due to physical incompatibility and risk of precipitation.

These constraints establish clear, label-based conditions for co-use. The macrolide is subject to Administration Incompatibility Restrictions, where substances like bentonite are prohibited to prevent the documented reduction in Tylosin's plasma exposure. Pharmacologically, the profile documents potential Pharmacodynamic Antagonism with certain other bacteriostatic agents and a notable Pharmacokinetic Exposure Modification resulting in the increase of Digitalis blood levels.

Mechanism of Action

Targeted Inhibition of Bacterial Protein Synthesis

Tylosin's primary mechanism of action is the selective inhibition of bacterial protein synthesis. It functions as a macrolide by binding reversibly to the large 50S ribosomal subunit , specifically obstructing the nascent peptide exit tunnel. This action physically prevents the bacterial cell from assembling essential functional and structural proteins.


Cessation of Microbial Proliferation (Bacteriostasis)

The resulting molecular blockade leads directly to a bacteriostatic effect—the cessation of the microbial population's ability to proliferate and increase in number. This mechanism modulates the rate of microbial proliferation, which is the foundational physiological change produced by the drug. The resulting lack of growth allows the host immune system to manage the static bacterial population.


Mechanisms of Resistance and Limitation

The mechanism is constrained by microbial defense systems, notably those that involve enzymatic methylation of the 23S ribosomal RNA, which mechanistically alters the target site. The mechanism is further constrained by bacterial efflux pumps, which actively transport the drug out of the cell, reducing the intracellular drug concentration available for ribosomal blockade.

Dosage and Administration Information

The usage of Tylan (Tylosin) is defined by standards for veterinary application, establishing precise requirements for administration across its available dosage forms. These instructions limit use to two primary administration methods: Intramuscular (IM) injection and Oral administration via medicated water or feed premix.


Administration Routes and Dosage Principles

The IM injectable solution requires dose calculation based on body weight, and the frequency varies by species. For cattle, the regimen is 8 mg per pound of body weight, administered once daily. In contrast, the IM dose for swine is 4 mg per pound of body weight, given twice daily. Oral administration uses the Soluble Powder in drinking water or the Premix in feed. The dose is defined by concentration (e.g., 2,000 mg/gallon for poultry) and the medicated water must be the sole source of drinking fluid during treatment.


Duration and Procedural Conditions

Treatment duration is non-universal and time-bound. IM injection in swine should not exceed 3 days, and for cattle, it is limited to 5 days; both require continuation for 24 hours after the remission of symptoms. Procedural constraints apply to ensure proper delivery: for injections, there are strict volume limits per injection site (e.g., not more than 10 mL for cattle). For oral solutions, instructions specify that the solution be prepared fresh every three days, specifically by adding water to the powder for proper dissolution. These standardized instructions guide the precise, quantitative application of Tylan.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Tylan

The following overview summarizes the types of scientific research conducted on Tylosin (Tylan), detailing what conditions and outcomes was observed in studies, and highlighting areas where the evidence remains limited or uncertain. This information is derived only from official regulatory and peer-reviewed sources and does not constitute medical advice or treatment recommendations.


Evidence exploring conditions characterized by respiratory issues in Poultry

Studies examining Tylosin for respiratory conditions, such as those associated with Mycoplasma in chickens and turkeys, have involved both Clinical Trials and technical Pharmacokinetic/Pharmacodynamic (PK/PD) Studies. Researchers monitored these studies during short-term treatment periods to examine pharmacokinetic endpoints.

The primary measures in this research included examining measurements related to changes in observable clinical symptoms, such as signs of coughing or labored breathing, and specific measurements of microbiological markers against Mycoplasma species. Studies described patterns observed in symptom measurements within the treated groups during the study timeframe. PK/PD research examined the Tylosin concentration achieved in critical tissues, such as the lungs, following administration.

While research contributes to understanding symptom patterns over the short term, there are certain limitations. Long-term outcomes after the treatment period are not extensively characterized in the literature. There is also limited information from large-scale studies on monitoring for symptom recurrence once the period of acute symptoms was observed.

Evidence exploring conditions characterized by gastrointestinal challenges in Swine

For specific gastrointestinal conditions in swine, such as Swine Dysentery and Ileitis, the evidence is largely based on Clinical Field Trials and studies that used comparator treatments. Research examined outcomes related to physical discomfort by measuring the severity of diarrhea using fecal consistency scores. They also monitored measurements of the pathogen load in the digestive system. Findings describe patterns observed in symptom measurements and often included metrics related to animal production, alongside clinical observations. The evidence quality varies across studies, particularly due to differences in research design, administration routes, and dosage levels.

Evidence exploring specific clinical populations

Research has been explored for other indications evaluated by regulatory authorities. Large-scale Field Trials have been conducted in beef cattle, where the key outcome monitored was measurements of liver abscesses recorded when the animals were processed. The findings describe data on abscess occurrence recorded in the studies, and the primary outcome is a production metric rather than a traditional measure of acute clinical health. For dogs, Tylosin was studied for a specific condition known as Tylosin-Responsive Diarrhea (TRD) using Randomized Controlled Trials (RCTs). Researchers measured changes in fecal consistency scores and the rate of monitoring for symptom recurrence. It is important to note that the research applies only to the specific clinical circumstances studied and the evidence does not generalize to other causes of diarrhea.

Long-Term Studies and Durability of Research Outcomes

Studies exploring Tylosin have typically involved follow-up durations that were limited to the immediate treatment or post-treatment period, or focused on long-term outcomes related to production metrics. There is limited information for long-term outcomes regarding the sustained resolution of symptoms or the durability of effect for many of the primary indications. Research focuses on trials assessing short-term or episodic symptom patterns, and long-term effects on the overall cycle of conditions characterized by fluctuating manifestations are not fully established.

What the Research Indicates is Still Uncertain

One significant area of ongoing research is the study of antimicrobial resistance (AMR) patterns that may be associated with the long-term or widespread use of macrolides like Tylosin in certain settings. Furthermore, data for certain groups remain insufficient, and comparative evidence is lacking in some areas where Tylosin is studied, meaning the findings related to short-term changes do not necessarily determine whether an individual animal will respond similarly or experience a lasting effect.

Key Studies & References

  1. Tylosin Tartrate powder, for solution - DailyMed (FDA Label Information)
  2. Targeted Durations of Tylosin Phosphate on Incidence and Severity of Liver Abscesses in Feedlot Cattle (Oklahoma State University Extension)
  3. Effect of continuous in-feed administration of tylosin to feedlot cattle on macrolide and tetracycline resistant enterococci in a randomized field trial (USDA ARS Publication)
  4. Addressing the Antimicrobial Resistance of Ruminant Mycoplasmas Using a Clinical Surveillance Network (Frontiers in Veterinary Science)

Frequently Asked Questions (FAQ)

Common questions about Tylan (FAQ)

Q: Has Tylan been approved by the FDA or similar regulatory bodies?

A: Yes, the product containing the active ingredient Tylosin has received approval as a New Animal Drug Application (NADA) from the U.S. Food and Drug Administration (FDA). This approval defines its authorized applications in particular animal species.

Q: Does Tylan require a prescription from a healthcare provider?

A: Yes, the product label includes a CAUTION stating that Federal law restricts this drug to use by or on the order of a licensed veterinarian. This classification indicates it is a prescription animal drug and requires proper professional authorization for its use.

Q: Is Tylan designated as a controlled substance?

A: No, according to official regulatory drug information, Tylan is not designated as a controlled substance. The product is listed as DEA Schedule: None.

Q: Is a generic version of Tylan available?

A: Yes, the active ingredient, Tylosin Tartrate, is available from different manufacturers. These generic formulations are commonly provided as a soluble powder.

Q: What does it mean if an official document lists a 'Black Box Warning' for Tylan?

A: A 'Black Box Warning' is the most stringent safety warning that the U.S. FDA requires for certain drugs. Official regulatory documentation for Tylan indicates that the product label does not contain this type of warning.

Q: Is Tylan used for long-term medical conditions?

A: Official information indicates that the research and regulatory standards for Tylan typically focus on short-term treatment periods. Consequently, data on long-term outcomes or the sustained resolution of symptoms is limited in the available documentation. The information does not characterize the use of this medication for chronic or long-term conditions.

Q: What happens in general if a prescribed course of Tylan is stopped early?

A: Official label instructions indicate the importance of completing the full course of treatment as prescribed by the veterinarian. Continuing the full course is generally advised even if the animal begins to show signs of improvement before the medication is finished.

Q: How soon should I expect to notice an effect from Tylan?

A: Regulatory documents note that, based on clinical observations, signs of improvement may be noted within one to two days after treatment begins for many animal species and conditions.

Q: Why does the time to see improvement vary among people taking Tylan?

A: Official research evidence indicates that observed outcomes and the time required to see improvement can vary. This variability is often attributed to differences in the research design of studies, the administration route used, or the dosage level applied.

Q: What is the general process for Tylan's elimination from the body?

A: Official guidelines establish a mandatory withdrawal period which relates to the drug's elimination from the animal's edible tissues, such as muscle, liver, and kidney. This period is a key regulatory requirement for food safety.

Q: Are there any specific dietary restrictions mentioned for Tylan use?

A: Regulatory information restricts the use of certain feed ingredients, specifically Bentonite and Sodium Metabisulfite, when administering Tylan. Additionally, if the soluble powder form is used in drinking water, that medicated water must be the animal’s only source of drinking fluid during the treatment period. These constraints are based on ensuring product stability and proper use conditions.

Q: Does Tylan interact with vitamins or herbal supplements?

A: Official regulatory documents do not list specific interactions between Tylan and vitamins or herbal supplements. However, caregivers are generally advised to inform the prescribing veterinarian of all products the animal is taking to ensure comprehensive oversight.

Q: Are there specific pre-existing conditions that increase the risks of Tylan usage?

A: The medication is contraindicated (prohibited) for animals with a known hypersensitivity or allergy to Tylosin or other macrolides. Furthermore, official product warnings indicate that its use is strictly contraindicated (prohibited) in horses and other equine species, specifically due to the risk of severe, potentially fatal diarrhea.

Q: What are the signs of a potential allergic reaction to Tylan?

A: Official safety information notes that adverse reactions can include hypersensitivity and, in very rare instances, a severe reaction called anaphylactic shock. Additionally, user safety warnings state that direct contact with the product on human skin may cause a rash.

Q: Does Tylan cause drowsiness or affect coordination?

A: Drowsiness or general lethargy is sometimes reported as a side effect in animals receiving Tylan. This type of effect is noted in safety documentation.

Q: Does Tylan typically cause weight gain or loss?

A: Weight changes are not listed as a common or confirmed adverse event on the product label. However, one non-standardized study noted an observation of increased weight gain as a specific finding.

Q: Is stomach upset a frequent reason for discontinuation in studies?

A: Gastrointestinal issues such as diarrhea and vomiting are documented in regulatory sources as common adverse reactions. While these are frequently noted, official documents do not explicitly quantify the precise rate at which these issues lead to the discontinuation of treatment in studies.

Q: Why is Tylan sometimes mentioned alongside drugs like Erythromycin?

A: Tylosin is often mentioned alongside drugs such as Erythromycin because it is classified as a macrolide antibiotic. This means both medications belong to the same therapeutic drug class and share a similar mechanism of action against bacteria.

Q: How does Tylan compare to similar treatments regarding official regulatory warnings?

A: While studies on Tylan may sometimes use comparator treatments for context, regulatory documents indicate that direct, comprehensive comparative evidence against all other similar treatments is limited or lacking in certain areas of research. The focus of official warnings remains specific to the Tylosin product itself.

How should Tylan be stored and disposed of?

Official Storage and Disposal Requirements for Tylan (Tylosin)

Official regulatory documents define specific, mandatory conditions for storing and disposing of Tylan.

Storage and Stability Requirement Detail
Temperature and Light Store the product at or below 25 C (77 F). The soluble powder form must be kept in a dry place and protected from direct sunlight.
Container Integrity The injectable solution must be discarded if unused 90 days after the vial is first punctured. The container must be kept tightly closed to prevent moisture exposure.
Child Safety The product label explicitly requires that Tylan must be stored KEEP OUT OF REACH OF CHILDREN.
Disposal Disposal of all unused or expired product must be done according to local regulations. The drug must not be released into the environment, sewers, or waterways, due to documented toxicity to aquatic life.

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

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