Common Food-Drug Interactions to Watch Out For
Certain foods can interfere with the effectiveness of prescription medications, potentially leading to unwanted side effects or reduced therapeutic benefits. It’s important to be aware of these interactions to ensure optimal health and medication efficacy. In this section, we will explore eight common foods that may interact with prescription drugs, highlighting the potential risks and providing tips on how to avoid them for better health management.
1. High-Fibre Foods and Certain Medications
High-fibre foods like soybean flour and walnuts can reduce the effectiveness of levothyroxine, used for treating an under active thyroid gland, and digoxin, used for heart failure. These foods can affect the absorption of the drugs and their effectiveness in treatment. It’s advised to take digoxin at least two hours before or after consuming meals or snacks high in fiber.
2. Bananas and ACE Inhibitors
Consuming potassium-rich foods like bananas, avocados, tomatoes, and dried apricots with blood pressure-lowering ACE inhibitors can lead to high potassium levels in the body, potentially causing dangerous heart arrhythmias, warns Brown. Limit your intake of potassium-rich foods while taking an ACE inhibitor. Some ACE inhibitors, such as captopril and moexipril (Capoten and Univasc), should be taken at least one hour before meals.
3. Liquorice and Blood Pressure Medications
Black liquorice contains glycyrrhizin, its active compound commonly known as a natural sweetener, and for its medicinal benefits. However, in conjunction with blood pressure (ACE inhibitors and diuretics) medications, it can cause abnormal heart rhythms and high blood pressure. The FDA warns that adults over 40 eating 2 ounces of black licorice daily for two weeks could develop an arrhythmia. Licorice can also interact with MAO inhibitors, blood thinners, and medications processed by the liver.
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4. Fruit Juice, antihistamines and certain blood pressure medications
Avoid grapefruit juice when taking calcium channel blockers for hypertension, as it can reduce the drug’s effectiveness. Apple or orange juice can decrease levels of beta-blockers like atenolol (Tenormin) or the renin inhibitor aliskiren (Tekturna). Acidic juices like apple, orange, and grapefruit juice can also interfere with newer antihistamines like fexofenadine (Allegra), neutralizing their effect. Avoid these juices within two to four hours of taking such antihistamines.
5. Cured Meats, Soy, and MAOIs
Monoamine oxidase inhibitors (MAOIs), an older class of antidepressants, can have dangerous interactions with foods high in tyramine, an amino acid. These foods include smoked and cured meats, aged cheeses, pickled or fermented foods, red wine, soy products, and overripe bananas. Consuming tyramine-rich foods while taking MAOIs can cause a sudden and dangerous spike in blood pressure. While MAOIs are less commonly used today, it’s best to avoid these foods if you’re taking this class of antidepressants.
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6. Dairy and Certain Antibiotics
Dairy products, such as milk, cheese, and yogurt, can interfere with antibiotics in the tetracycline class (doxycycline and minocycline) and ciprofloxacin (a quinolone antibiotic). The calcium in dairy can inhibit the absorption of these drugs, reducing their effectiveness in treating bacterial infections. To avoid this, refrain from consuming calcium-containing foods one hour before or two hours after taking these antibiotics.