Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Solifenacin.

Abnormal heart rhythm: Solifenacin may cause a heart rhythm disturbance called QT prolongation. If you have a history of QT prolongation or are taking certain medications (e.g., Amiodarone, Sotalol), discuss with your doctor how Solifenacin may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Solifenacin, and whether any special monitoring is needed.

Bladder outflow obstruction: If you have a medical problem that obstructs the flow of urine from the bladder (e.g., enlarged prostate, Prostate Cancer), Solifenacin may make you unable to urinate. If you have a problem with urinary flow, discuss with your doctor how Solifenacin may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Solifenacin, and whether any special monitoring is needed.

Blurred vision: Solifenacin may cause blurred vision. Avoid activities such as driving, operating machinery, or performing hazardous work until you know how solifenacin affects your vision.

Gastrointestinal disorders: Solifenacin can slow movement through the gastrointestinal tract. If you have decreased gastrointestinal movement caused by a medical problem (e.g., Diabetes), surgery, or medications, discuss with your doctor how Solifenacin may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Solifenacin, and whether any special monitoring is needed.

Heat Stroke: Solifenacin causes a decrease in sweating, which is one of the body's way of cooling off. When solifenacin is taken during very hot weather, it can cause Fever and Heat Stroke due to the body being unable to cool down enough. Take care not to overheat when you are taking Solifenacin. Stay in a cool environment if possible, limit the length of time you spend outdoors, and drink plenty of water to reduce the risk of heat stroke.

Kidney function: If you have reduced kidney function or Kidney Disease, discuss with your doctor how Solifenacin may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Solifenacin, and whether any special monitoring is needed. If you have severe kidney function impairment, do not take daily doses greater than 5 mg of solifenacin.

Liver function: The liver is responsible for removing solifenacin from the body. If the liver is not working well, the medication can build up in the body, causing unwanted side effects. If you have reduced liver function or liver disease, discuss with your doctor how Solifenacin may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Solifenacin, and whether any special monitoring is needed.

If you have moderate liver function impairment, do not take daily doses greater than 5 mg of solifenacin, and have your doctor monitor your condition closely. Do not take solifenacin if you have severe liver function impairment.

Pregnancy: Solifenacin should not be used during pregnancy unless the benefits outweigh the risks. Women of childbearing age should talk to their doctor about whether birth control is appropriate. If you become pregnant while taking Solifenacin, contact your doctor immediately.

Breast-feeding: It is not known if solifenacin passes into breast milk. If you are a breast-feeding mother and are taking Solifenacin, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.

Children: The safety and effectiveness of using Solifenacin have not been established for children.