1.Grapefruit
This citrus fruit changes the way certain cells in your gut take in and move medication through your body — it can affect more than 50 drugs. It can make some, like fexofenadine (Allegra) for allergies, less effective and make others too strong, including ones that lower your cholesterol like atorvastatin (Lipitor).
2.Milk
This dairy product can make it harder for your body to process certain antibiotics. Minerals in milk like calcium and magnesium are part of the reason, along with the protein casein. If you’re taking antibiotics, make sure to find out about the foods or beverages you should stay away from.
