2026 Top 7 Equine Systemic Injectable Broad-Spectrum Antibiotics in Canada
Published on Thursday, February 26, 2026
This category covers injectable antibiotic formulations for systemic treatment in horses that provide broad-spectrum coverage against common bacterial pathogens. It includes fast-acting and long-acting options designed for emergency and field use, with practical administration formats such as ready-to-use prefilled syringes and multi-dose vials. Products in this group are chosen by Canadian buyers and prescribers for reliable antimicrobial coverage, predictable pharmacokinetics in equids, clear veterinary dosing guidance, and stewardship-conscious labeling. Important market preferences include stability under barn conditions, single-dose or preloaded options for rapid response, documented withdrawal intervals for performance or food-animal scenarios, and an established clinical track record with local veterinarians. In Canadian equine practice, decision factors also emphasize ease of administration during on-farm emergencies, clear storage instructions, and product formats that support veterinary oversight and minimize the risk of dosing errors.
Top Picks Summary
Excenel RTU EZ
Excenel RTU EZ is a ready-to-use ceftiofur formulation favored in equine practice for reliable beta-lactam broad-spectrum coverage and the convenience of a pre-mixed injectable. It earns a best-in-class position for combining strong activity against common equine pathogens with reduced preparation time and lower waste compared with multi-component generics, though its acquisition cost is typically higher than basic tetracyclines.
![EXCENEL RTU EZ [100 mL]](/_next/image?url=https%3A%2F%2Fwww.armoranimalhealth.com%2Fmedia%2Fcatalog%2Fproduct%2Fcache%2F207e23213cf636ccdef205098cf3c8a3%2F_%2Fe%2F_e_x_excenel_rtu_ez_100_ml.jpg&w=3840&q=75)
Pendi-Strep
Pendi-Strep is an established penicillin-plus-streptomycin combination valued in equine practice for reliable coverage of many gram-positive and some gram-negative pathogens and a low acquisition cost. It earns a top position here because it is often the most cost-effective systemic injectable choice for common equine infections, though it lacks the concentrated gram-negative punch of gentamicin and the long-acting, single-dose convenience of macrolides like Draxxin. Compared with Trivetrin, Pendi-Strep is generally preferred when strong beta-lactam activity is required and when budget constraints drive treatment decisions.
Borgal
Borgal is a high-potency fluoroquinolone injectable known for excellent gram-negative activity and superior tissue penetration, used when rapid, robust antimicrobial action is needed in equine systemic infections. As a market leader for potent, targeted therapy it typically commands a premium price relative to aminoglycosides and tetracyclines, but provides technical advantages in pharmacokinetics and clinical efficacy for severe or refractory cases.
Baytril 100
Baytril 100 is a widely used enrofloxacin injectable recognized for broad-spectrum activity, excellent tissue penetration, and an extensive clinical track record in equine medicine. It competes directly with other fluoroquinolones like Borgal on technical performance, and as a global brand it often provides advantages in regulatory availability and supply-chain reliability that can translate to more consistent pricing and access for veterinary practices.
Trivetrin
Trivetrin (a broad-spectrum trimethoprim–sulfonamide style regimen) is positioned for versatile systemic coverage against a wide range of bacterial species, offering a balance of spectrum and cost that makes it attractive for many equine indications. It stands out relative to Pendi-Strep by providing broader activity against some atypical and intracellular organisms and is often less nephrotoxic than aminoglycosides like Gentocin, while being more affordable than long-acting macrolides such as Draxxin. For clinicians seeking a middle-ground injectable with broad coverage and favorable economics, Trivetrin is a practical choice.
Gentocin Injectable
Gentocin Injectable (gentamicin sulfate) is a market leader for potent gram-negative bactericidal activity and is widely used in equine practice for severe or mixed infections, particularly when combination therapy with a beta-lactam is indicated. Its technical advantage is rapid, high-level bactericidal effect against many enteric and hospital-acquired gram-negatives, but this comes with higher monitoring needs and nephrotoxicity risk compared with Pendi-Strep and Trivetrin, and it does not offer the prolonged dosing interval provided by Draxxin. Economically, Gentocin can drive higher ancillary costs (monitoring, fluid support), so it is typically reserved for cases where its superior gram-negative coverage is essential.
Draxxin
Draxxin (tulathromycin) is a long-acting macrolide that provides excellent tissue penetration and the convenience of single-dose therapy for respiratory pathogens, making it a market leader when prolonged exposure and compliance are priorities. It is technically distinct from the other products listed because its extended duration and tissue distribution can reduce repeat handling and labor costs, but it is generally more expensive per dose and may be used off-label in horses, unlike more commonly labeled equine products such as Pendi-Strep or Gentocin. Compared with the aminoglycoside and beta-lactam options, Draxxin trades broader gram-negative bactericidal strength for convenience and sustained macrolide activity against respiratory organisms.
What the Research and Guidelines Say
Veterinary pharmacology and field studies provide the basis for selecting systemic injectable antibiotics for horses. Research evaluates spectrum of activity, tissue penetration, elimination half-life in equids, safety profiles, and practical aspects like formulation stability and withdrawal intervals. Canadian veterinary guidance and international stewardship recommendations both stress using the narrowest effective agent, following labeled withdrawal times, and always treating under veterinary direction to limit resistance development.
Cephalosporins, such as ceftiofur formulations, have been well studied in horses for respiratory and soft tissue infections and show predictable plasma and tissue levels that support short-course therapy when used appropriately.
Penicillin plus aminoglycoside combinations (for example, penicillin with gentamicin or streptomycin combinations) remain time-tested for many equine infections, but aminoglycosides require renal monitoring because of nephrotoxicity risk.
Fluoroquinolones, such as enrofloxacin, provide broad gram-negative coverage but are considered higher-risk for resistance selection and should be reserved for cases where culture and sensitivity or severe infection justify their use.
Long-acting macrolides and azalides can provide extended tissue exposure useful in field settings, but labeled approvals and off-label use restrictions vary; consult a Canadian veterinarian and product labeling before use.
Pharmacokinetic and residue studies emphasize checking withdrawal intervals for performance horses and any animals entering the human food chain; product-specific withdrawal times vary and must be respected.
Stewardship and Canadian regulatory trends increasingly favor documented veterinary oversight, accurate record keeping, and use of formulations that reduce handling errors, such as RTU syringes or clearly labeled multi-dose vials.
Frequently Asked Questions
Which horse antibiotic should I choose for field emergencies?
For field convenience, Excenel RTU EZ is a ceftiofur sodium ready-to-use injectable for convenient IV or IM administration, with a 4.5 average rating and no reconstitution required.
What exact active ingredient does Pendi-Strep contain?
Pendi-Strep is a combination penicillin plus streptomycin formulation, typically administered intramuscularly, and it has a 4.7 average rating.
Is Excenel RTU EZ worth paying for over Pendi-Strep?
The provided data lists Excenel RTU EZ as a ready-to-inject ceftiofur sodium product (4.5 rating) and Pendi-Strep as penicillin plus streptomycin (4.7 rating), but no Canada prices are given.
Does Borgal work for gram-negative systemic infections in horses?
Borgal is enrofloxacin injectable with potent Gram-negative activity, used IV/IM, for serious infections; it has a 4.3 average rating, but no warranty duration is provided.
Conclusion
This page highlights seven widely used systemic injectable broad-spectrum antibiotics for Canadian equine practice: Excenel RTU EZ, Pendi-Strep, Borgal, Baytril 100, Trivetrin, Gentocin Injectable, and Draxxin. Each product offers different strengths for field and clinic use; among them, Excenel RTU EZ stands out for many Canadian situations because of its ready-to-use format, broad coverage, and predictable pharmacokinetic profile that supports rapid, on-site decision making under veterinary guidance. We hope you found what you were looking for. If you want to refine or expand your search, use the site search to filter by drug class, administration format, withdrawal time, or veterinary prescribing information.