Have you ever wondered why some medications seem to lose their effectiveness after a few days? You might start to question whether the drug is fake, expired, or if you got the wrong prescription. Sometimes, people even blame their bad luck on external factors. But did you know that certain foods can actually interfere with how your medications work?

Certain foods can reduce the effectiveness of your medications or even cause harmful side effects. We’ve put together a list of six common food and medication combinations to avoid. It’s information that can really help, so feel free to share it with others.

1. For instance, while bananas are packed with potassium, this mineral can accumulate in the blood when you’re taking anti-hypertensive medications, which also increase potassium levels. Too much potassium can lead to irregular heartbeats, heart palpitations, and even arrhythmia. To keep your heart healthy, it’s best to avoid eating bananas while on these medications.

2. Similarly, iron is essential for the liver and also plays a role in the life cycle of malaria parasites. Vitamin C helps absorb iron, which can inadvertently benefit the parasites and undermine your malaria treatment. So, it’s wise to steer clear of citrus fruits or high-dose Vitamin C supplements while treating malaria.

3. When you take painkillers with soft drinks, the carbon dioxide and acidity in the drink can increase the concentration of the medication in your bloodstream, potentially leading to toxicity. It’s safer to stick with plain water when taking painkillers.

4. Antibiotics like tetracycline and penicillin work to fight bacterial infections, but dairy products, which are high in calcium, can interfere with their absorption. To ensure these antibiotics are effective, avoid consuming dairy around the time you take your medication.

5. Statins help lower cholesterol but can have side effects. Grapefruit contains a compound that inhibits the breakdown of statins in the intestine, which can lead to dangerously high levels of the drug in your system. It’s best to avoid grapefruit while on statins.

6. Finally, if you’re on anticoagulants (blood thinners) such as aspirin or warfarin, leafy greens, which are rich in Vitamin K, can counteract their effects by promoting blood clotting. Be mindful of your leafy green intake to ensure your medication remains effective.