1. Cycloxan 50 mg is a chemotherapy drug used to treat cancer and some autoimmune diseases. 2. It helps reduce the activity of the immune system, preventing it from attacking healthy cells. Cycloxan 50 mg is available in tablet form and should be taken as prescribed by your doctor. . Side effects can include nausea, vomiting, hair loss, and an increased risk of infection. 5. Before taking Epoxan 50 mg, discuss with your doctor the possible risks or side effects.