(Novartis Animal Health) Onsior Tablets are indicated to control postoperative pain and inflammation associated with orthopedic surgery, ovariohysterectomy, and castration in cats 6 months of age and older. Each Onsior Tablet contains 6 mg robenacoxib. The recommended dosage is 0.45 mg per lb. orally once daily, for a maximum of three days. Robenacoxib.