Rethinking your morning coffee

Coffee and other caffeine sources can interact with many common drugs, changing the way they’re absorbed, distributed through the body, processed, and excreted. Coffee (even decaf) makes stomach contents more acidic, accounting for some drug interactions, but caffeine is mostly the cause. Medications vulnerable to coffee or caffeine’s effects include those for cold or allergy, depression, high blood pressure, asthma, osteoporosis, anemia, Alzheimer’s disease, thyroid problems, and insomnia. Drinking coffee and taking medications at separate times is advised.