In general, drinking prune juice has no side effects, but it is easy for patients with high blood sugar to make their blood sugar rise, and allergic patients will have allergic reactions. Prune juice contains high sugar content, every 100 grams of prune juice contains 18 grams of carbohydrates, high blood sugar patients drink too much prune juice, it is easy to blood sugar fluctuations, so high blood sugar patients can not drink prune juice for a long time. Some people are allergic to prune juice, it is not recommended to drink. If there is any discomfort after drinking prune juice, it is recommended to consult a doctor in time.