From eggs and cereal to doughnuts and dessert, countless foods go well with coffee. But the same can't be said for pairing java with some prescribed and over-the-counter drugs, often because of the caffeine. "It's important to tell your doctor about your caffeine intake because it can interfere with medications," said medical expert Dr. Nerissa Fernandes (via American Medical Association ).

Take common cold remedies that contain fexofenadine and pseudoephedrine, for instance. These medications are a dream if you're feeling sick because they stop troublesome symptoms like nasal congestion and sneezing. However, the caffeine (a stimulant) in coffee can cause unintended responses when combined with them, including a rise in your blood pressure.

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