Easy and Accurate Deworming

The new dial-a-dose applicator gun for SYNANTHIC allows cattle producers to more easily and accurately deworm their cattle against damaging internal parasites.

Product Description

SYNANTHIC Bovine Dewormer Suspension is a broad-spectrum anthelmintic effective for the removal and control of lungworms, roundworms and tapeworms in cattle. SYNANTHIC is fast, effective and available in a low-dose formulation. SYNANTHIC is readily absorbed in the gastrointestinal tract and goes to work rapidly to reduce parasite populations.

Features & Benefits

SYNANTHIC is effective in the removal and control of the following parasites in cattle:


  • Dictyocaulus viviparus (Adult, L4)

Stomach Worms:

  • Barberpole Worms Haemonchus contortus (Adult)
  • Haemonchus placei (Adult)
  • Small Stomach Worms Trichostrongylus axei (Adult)
  • Brown Stomach Worms Ostertagia ostertagi (Adult, L4, inhibited L4)

Intestinal Worms:

  • Nodular Worms Oesophagostomum radiatum (Adult)
  • Hookworms Bunostomum phlebotomum (Adult)
  • Small Intestinal Worms Cooperia punctata (Adult, L4)
  • Cooperia oncophora (Adult, L4)
  • Cooperia surnabada (Adult, L4)


  • Moniezia benedeni (Adult)

Consult a veterinarian for assistance in the diagnosis, treatment and control of parasitism.

Low dose

Five mL/550 pounds of body weight dose reduces product waste, provides more accurate dosing, and allows for less processing time and stress.

Safety: There are no contraindications for the use of SYNANTHIC Bovine Dewormer Suspension, 22.5%, in cattle.


Unlike Safe-Guard, SYNANTHIC controls L4, inhibited L4 O. ostertagi and tapeworms without the need for doubling the label dosage (and the cost).


With just one squeeze from the applicator per head, drenching is complete.

Fast and long-acting

SYNANTHIC reaches peak blood concentrations in approximately 20 hours. When compared to Safe-Guard® administered at 1.5 times the label dosage, SYNANTHIC remained at higher concentration levels for a longer period of time. 1


Demonstrated efficacy against major intestinal parasites including L4, inhibited L4 Ostertagia ostertagi and tapeworms.


Adapted from Prichard RK, Hennessy DR, Steel JW, et al. Metabolite concentrations in plasma following treatment of cattle with five anthelmintics. Res Vet Sci 1985;39(2):173–178.

Download a copy



  • Administered orally at the rate of 1 mL per 110 lb. (50 kg) of body weight
  • Shake well immediately prior to use
  • Supplied in 500 mL and 1 liter packages containing 225 mg of oxfendazole per mL

Safety Information:

Residue Warnings: Cattle must not be slaughtered until 7 days after treatment. Because a withdrawal time in milk has not been established, do not use in female dairy cattle of breeding age.

Safety: There are no contraindications for the use of SYNANTHIC Bovine Dewormer Suspension, 22.5%, in cattle.

Product Resources

Contact Information

  • Boehringer Ingelheim Vetmedica, Inc.

    Cattle Division

    3239 Satellite Blvd NW,
    Duluth, GA 64506

    • Phone 866-638-2226
    • Fax 816-326-9167
    • e-mail