Nilotinib capsules, also known by the brand name Tasigna, belong to the pharmacological category of kinase inhibitors, specifically tyrosine kinase inhibitors (TKIs). 

This medication is an antineoplastic (anti-cancer) agent used to treat Philadelphia chromosome-positive chronic myeloid leukemia (Ph+ CML). 

Key categories for nilotinib include:

• Pharmacological Class: Tyrosine Kinase Inhibitor (TKI)

• Therapeutic Area: Oncology (cancer medicine)

• Mechanism of Action: It works by blocking the action of an abnormal protein (BCR-ABL kinase) in cancer cells, which helps to stop or slow the spread of the cancer cells.