Common Kisqali side effects can include: Hair loss, Itching, Constipation, Diarrhea, Nausea, Vomiting, Leukopenia, Neutropenia, Infectious disease, Joint pain, Back pain, Headache, Cough, Fatigue Serious side effects of Kisqali can include: Prolonged QT interval, Sudden cardiac death, Fainting, Anemia, Febrile neutropenia, High-grade leukopenia, Lymphocytopenia, High-grade neutropenia, Interstitial lung disease, Pneumonitis Other Considerations Compare the Kisqali cost at Canada Pharmacy to your local drug store.