Verzenio may cause serious side effects, including:
Diarrhea is common with Verzenio, may be severe and may cause dehydration or infection. The most common time to develop diarrhea is during the first month of Verzenio treatment. Your doctor may stop your treatment, lower your dose, or tell you to wait to begin your treatment cycle if you have diarrhea.
At the first sign of loose stools, tell your doctor. You may be advised to start taking an antidiarrheal medicine (such as loperamide) and drink more fluids.
Low white blood cell counts (neutropenia) are common with Verzenio and may cause serious infections that can lead to death. Your doctor should check your white blood cell counts before and during treatment. Tell your doctor right away if you have fever or chills.
Verzenio can cause liver problems. Tell your doctor right away if you have any of the following signs or symptoms of liver problems:
- Feeling very tired
- Loss of appetite
- Pain on the upper right side of your stomach area (abdomen)
- Bleeding or bruising more easily than normal
Verzenio may cause blood clots in your veins or lungs. These may be serious and have led to death. Tell your doctor if you have the following signs and symptoms of a blood clot:
- Pain or swelling in your arms or legs
- Fast breathing
- Shortness of breath
- Fast heart rate
- Chest pain
Verzenio can harm your unborn baby. Use effective birth control during treatment and for at least 3 weeks after the last dose of Verzenio and do not breastfeed during treatment with Verzenio and for at least 3 weeks after your last dose. Verzenio may affect the ability of males to father a child.