Virginiamycin Injection

Updated: 2026-07-17

Overview

Ivermectin Injection is a veterinary pharmaceutical formulation containing ivermectin, a semi-synthetic derivative of avermectin B1. Developed in the 1970s, it revolutionized parasite control in livestock and pets by effectively targeting both endoparasites (e.g., roundworms) and ectoparasites (e.g., mites). The injectable form provides systemic distribution, making it particularly valuable for herd treatments in cattle, swine, and other production animals. As a GABA agonist, ivermectin causes paralysis and death in susceptible parasites while having relatively low toxicity in mammals when properly dosed. Its widespread use in agriculture has made it one of the most important veterinary antiparasitics globally, though resistance concerns emphasize the need for rotational use with other drug classes.

Physical and Chemical Properties

Ivermectin Injection is formulated as a sterile solution typically containing 1-3.15% w/v of ivermectin dissolved in a vehicle of propylene glycol or similar solvents. The active compound consists of at least 80% 22,23-dihydroavermectin B1a and not more than 20% 22,23-dihydroavermectin B1b. The solution appears clear and ranges from colorless to pale yellow, depending on concentration and excipients. Chemically, ivermectin is a macrocyclic lactone with limited water solubility (≈4 mg/L at room temperature) but good solubility in organic solvents. Its stability in solution depends on proper storage conditions - exposure to light or high temperatures can accelerate degradation. The pH of commercial formulations is typically adjusted to 4.5-7.5 to ensure stability and reduce injection site reactions.

Main Applications

In livestock production, Ivermectin Injection is primarily used for controlling gastrointestinal roundworms, lungworms, eyeworms, grubs, and mange mites in cattle, swine, sheep, and goats. A single subcutaneous dose (200 μg/kg body weight) typically provides protection for 4-6 weeks. The product is particularly valued for its persistent activity against reinfestation. In companion animals, injectable ivermectin is used off-label for certain parasitic conditions under veterinary supervision, though caution is required in dog breeds with MDR1 gene mutations (e.g., Collies). Some aquaculture applications exist for parasite control, but environmental toxicity concerns limit this use. The product is strictly for veterinary use and not approved for human administration.

Safety and Storage

Ivermectin Injection requires careful handling due to its toxicity profile. Workers should wear gloves and eye protection when administering the product. Accidental human injection requires immediate medical attention. The solution is flammable and should be kept away from heat sources. Proper storage at 2-8°C maintains stability for typically 2-3 years from manufacture. Frozen or overheated product may precipitate and lose efficacy. Opened vials should be used promptly or discarded according to veterinary pharmaceutical waste protocols. Empty containers must be disposed of properly to prevent environmental contamination, particularly near aquatic ecosystems where ivermectin is highly toxic to invertebrates.

B2B Procurement Guide

When sourcing Ivermectin Injection commercially, verify the manufacturer holds valid GMP certification for veterinary pharmaceuticals. Key specifications to confirm include ivermectin concentration (standard is 1% for cattle, higher concentrations for swine), sterility testing documentation, and batch-specific expiration dates. Bulk purchases (5-20L containers) commonly offer 15-30% cost savings versus single-dose vials. Consider cold chain logistics for transportation, especially in warm climates. Some markets require veterinary prescriptions for purchase. For export transactions, confirm whether the formulation meets regulatory standards in the destination country, as approved additives and concentrations vary internationally.