Use Ceenu (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed. Lomustine is taken in a single dose once every 6 weeks. Follow your doctor's dosing instructions very carefully. Because an overdose of lomustine can be fatal, you will be given only enough of this medicine to take one dose every 6 weeks. To get the correct dose, you may need to take 2 or more capsules that are different types and colors. Wear disposable rubber gloves when you handle a lomustine capsule. Throw the gloves away after one use. Do not open the lomustine capsule. Do not use a broken pill. The medicine from a broken pill can be dangerous if it gets on your skin. If this occurs, wash with soap and water. Ask your doctor or pharmacist how to safely handle and dispose of a broken capsule. Lomustine can weaken (suppress) your immune system. Serious and sometimes fatal infections may occur up to 6 weeks after you are treated with this medicine. You will need frequent medical tests. Store at room temperature away from heat and moisture. Keep the bottle tightly closed until you are ready to take the medicine. Lomustine can have long lasting effects on your body. Your blood will need to be tested for at least 6 weeks after each dose of this medicine.