Prune juice has a mild laxative effect, which some people experience more powerfully than others, and common side effects of drinking prune juice include bloating and gas, according to SFGate. Drinking excessive amounts of prune juice can sometimes cause diarrhea, adds Dr. James Ferguson of HealthTap.
Due to its high fiber content, prune juice works as an effective constipation remedy, explains SFGate. In fact, prune juice has been shown to work just as well as over-the-counter constipation medications. The potassium in prune juice helps to reduce the risk of hypertension by normalizing blood pressure, and its nonheme iron content protects against anemia. Prune juice also contains vitamin C and boron.
Prune juice is an excellent source of antioxidants, iron, potassium and easily digestible fiber. A cup of prune juice contains 182 calories, 45 grams of carbohydrates, 1.56 grams of protein and a negligible amount of fat, according to SFGate. Its carbohydrate content includes 2.6 grams of fiber, which represents 10 percent of the recommended daily value for fiber, and 42 grams of natural sugars.
Prunes and prune juices contain significant amounts of heart-protective antioxidant phenolic compounds, which help to prevent heart disease by working against the oxidation of LDL cholesterol, states SFGate.