Sold under the brand name “Ontak”, Denileukin Diftitox is indicated for the treatment of certain kinds of lymphoma. According to drugs.com, it works by “interfering with the growth of cancer cells, which results in the death of the cells.” Before you go ahead and use this medication, you should first tell your doctor if you are pregnant or breastfeeding. You should also tell them if you are allergic to any medicines or foods, or if you’re taking any drugs at all. Bear in mind that Denileukin Diftitox is typically given by the doctor as an infusion. It is also worth noting that this dug may cause dizziness, and therefore, you should not drive or do any other activity that requires your full attention until you know how your body reacts to it. In addition, the elderly may be more sensitive to the effects of Denileukin Diftitox. Therefore, using it with caution is highly recommended. Don’t forget to call your healthcare provider if you experience any of the following side effects: confusion, lightheadedness, constipation, diarrhea, vomiting, and headache. You should also seek medical attention when you have severe allergic reactions such as itching, hives, and trouble breathing.