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Canadian scientists have found that some fruit juice reduces the effectiveness of drugs used to treat cancer, cardiovascular disease and hypertension.
This primarily relates to an orange, apple and grapefruit juice. They reduce the effectiveness of certain antibiotics and drugs that reduce the temperature.
Thus, experts advise not to drink fruit juice at least 2 hours prior to medication, and medications drink only pure water. The rest of the time you can consume juices, and even necessary, so they have a lot of useful properties.