(Virbac) Soloxine provides thyroid replacement therapy in all conditions of inadequate production of thyroid hormones. Each Soloxine (Levothyroxine Sodium, USP) Tablet provides synthetic crystalline levothyroxine sodium (L-thyroxine). The initial recommended dose of Soloxine is 0.1 mg/10 lb body weight twice daily. The usual maintenance dose is 0.1 mg/10 lb once daily. L-thyroxine.