does grapefruit affect blood pressure medications
School of Medicine, Family Medicine answered. If you're on blood pressure medication, you should avoid eating grapefruit. The reason why is that grapefruit is very acidic and breaks down certain medications much faster. For some people, this causes them to absorb too much of the medicine and for others, not enough. Blood pressure medications that are affected by grapefruit juice include calcium channel blockers such as nifedipine.