1. Bananas and Anti-hypertensive Drugs While bananas are rich in potassium, anti-hypertensive drugs also increase potassium levels in the blood. Combining anti-hypertensive drugs and bananas can lead to an excess of potassium, which may cause irregular heartbeat, heart palpitations, and conditions like arrhythmia. It’s important to protect your heart by avoiding this combination. 2. Vitamin C and Anti-malaria Drugs All drugs are metabolized in the liver, which is rich in iron. Iron is crucial for the life cycle of malaria parasites (plasmodium). Vitamin C aids in the absorption of iron, 3. Painkillers and Soft Drinks Soft drinks contain carbonated water, which consists of carbon dioxide dissolved in water under pressure. When you consume painkillers with soft drinks, the carbon dioxide and acidity increase the concentration of the drugs in your blood