EQUISUL-SDT: Questions & Answers
(Sulfadiazine/Trimethoprim)

Q: What is EQUISUL-SDT®?

A: EQUISUL-SDT® (Sulfadiazine/Trimethoprim) is an oral antibiotic suspension of sulfadiazine and trimethoprim approved by the FDA for twice a day use in horses.

Q: What Infections Do EQUISUL-SDT® Control?

A: EQUISUL-SDT® is approved for the treatment of respiratory tract infections caused by susceptible strains of Streptococcus equi subsp. Zooepidemicus.

Q: What Makes EQUISUL-SDT® Unique?

A: It is the only oral liquid antibiotic currently approved for horses that has proven efficacy and safety.

Q: Why Shouldn’t My Vet Prescribe the White SMZ Tabs?

A: Now that there is an approved form of sulfa based antibiotic for horses, it is illegal for veterinarians to continue prescribing the human approved pills. Second, before EQUISUL-SDT®, veterinarians had to use the human approved tabs because we didn’t have anything better. Those tabs are formulated for humans to absorb, not horses and do not reach consistent blood levels in the horse necessary to fight infection.

Q: How Do I Give EQUISUL-SDT® to My Horse?

A: The prescribed volume of EQUISUL-SDT® is drawn up into a syringe and then slowly squirted into the back of your horse’s mouth, on top of its tongue. Go slowly and allow your horse to swallow during administration.

Q: What are the Possible Side Effects?

A: In rare instances, antibiotics can cause loose stool, colic and diarrhea. If any of these are observed while your horse is on EQUISUL-SDT®, call your veterinarian immediately!

Q: Why Should I  Ask My Vet for EQUISUL-SDT® instead of SMZ tablets?

A: You want the best for your horse, you want your horse to have an antibiotic that is FDA approved for horses with proven efficacy and safety! Additionally, unlike SMZ, EQUISUL-SDT® has an apple flavoring horses love. This allows you to administer the antibiotic per your veterinarian’s instructions and duration without your horse spitting out the drug.