Rx Valcor Injection for Cattle Rx Valcor is a combination doramectin and levamisole injection designed for the treatment and control of a variety of parasitic infections in beef cattle and replacement dairy heifers. It effectively targets gastrointestinal roundworms, lungworms, eyeworms, grubs, sucking lice, and mange mites. Suitable for use in beef cattle 2 months of age and older, as well as replacement dairy heifers under 20 months of age. Features: Combination of doramectin and levamisole for effective parasitic control Treats and controls gastrointestinal roundworms, lungworms, eyeworms, grubs, sucking lice, and mange mites Approved for use in beef cattle 2 months and older and replacement dairy heifers under 20 months Injectable formulation for easy administration For Valcor Injectable Applicator see item# 040ZOE-26573. This product requires a Valid prescription. All prescription items are Non-Refundable and Non-Returnable.