The drug named darifenacin generically is marketed in the United States with the brand name Enablex. Physicians prescribe the extended-release pill form of darifenacin to help fight bladder ailments. These may include the inability to control bladder function and frequent urination urgency. The typical dose of darifenacin for adults is 7.5 mg each day, according to the Mayo Clinic.
Stomach Pain
Taking darifenacin tablets may induce the common and non-serious side effect of pain in the stomach. This will be temporary and mild in most people. This also can include discomfort in the stomach, caused by acidity. The patient should consult with a physician if stomach pain persists or is severe, the Mayo Clinic recommends.
Constipation and Diarrhea
The person taking darifenacin also may have other problems within her digestive system that cause defecation difficulties. For example, the medication may cause difficulty making a bowel movement because, with the system disrupted, too much liquid may be extracted from digesting food. This makes it hard for excrement to maneuver through the intestines, causing constipation. On the other side, loose stools or diarrhea may be experienced because too much fluid is left in the stools. Cramps may be a symptom of either of these common, non-serious side effects that, in most people, continue a few days after beginning treatment with darifenacin.
Blurry Vision
Because darifenacin changes the way the body uses liquid, it can have an effect on vision. For example, the person taking the medication may find it difficult to focus the eyes properly. This can occur because the balance of fluid in the eyes is not at its usual level. Fluid at a certain pressure is required to focus vision on far and near objects. The medication also may cause less fluid to lubricate the outside of the eyeballs, making dry eyes another side effect. These, too, are non-serious common side effects, Drugs.com reports, that should be reported to a physician only if they are severe or do not go away on their own after several days.
Flu-Like Syndrome
Darifenacin is similar to many other medications in that it can cause a condition known as flu-like syndrome. This means the person taking the medication may experience common symptoms of the flu or a cold without actually having either. For example, she may have a mild fever and chills. She also may develop a cough and sore throat, as well as nasal congestion. These problems typically only occur at the start of treatment and disappear in a few days, Drugs.com states.
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