Natulan capsules are used to treat certain types of cancer, such as lymphoma and testicular cancer. They contain procarbazine, which works to stop the growth of cancer cells by affecting the DNA inside the cell, preventing it from dividing. Natulan is used orally in doses determined by the doctor according to the patient's condition. Strict adherence to the dose must be made to avoid side effects, which may include nausea, vomiting, loss of appetite, and low blood cells. It may also cause liver disorders or neurological problems when used for long periods. Certain foods, such as cheese, sausages, and alcoholic beverages, should be avoided during treatment because Natulan capsules may interact with certain substances and lead to a sudden increase in blood pressure. They should also not be used during pregnancy or breastfeeding, and it is necessary to inform the doctor of any other medications being taken to avoid interactions.