Consider carefully what liquid you wash medication down with: Some beverages can interact with drugs, lessening their effectiveness or even posing health hazards.

Grapefruit Juice: This citrus slows down enzyme activity needed to process more than 50 drugs.

Milk: Calcium makes it harder for the body to absorb some prescriptions, such as thyroid pills.

Orange Juice: Look out for symptoms of too much potassium in your system, like muscle cramps.

Green Tea: Vitamin K can decrease the effect of blood thinners such as warfarin (Coumadin).