For Many, the Morning Starts with a Cup of Coffee. Coffee brings joy and energy, ranking as one of the most consumed beverages globally. However, for some individuals taking medications, coffee may pose potential risks. Let’s explore in detail how coffee interacts with specific drugs. Are Coffee and Medications Friends or Foes? Coffee’s “energy-boosting” effect stems from caffeine, which stimulates the central nervous system. Pharmacologically, caffeine also activates the cardiovascular system, promotes gastric acid secretion, and has diuretic properties. These very characteristics can trigger interactions when coffee meets medications, primarily affecting drug absorption and metabolism—especially critical for long-term medication users. Additionally, the interaction depends on coffee concentration, consumption volume, and individual physiology. Six Medication Classes Best Avoided with Coffee Analgesics and Antipyretics Combining these with coffee may cause gastrointestinal discomfort. When treating fever or colds, common analgesics like acetaminophen or ibuprofen are often used. These drugs already irritate the gastric mucosa, while caffeine further stimulates gastric acid secretion. Under this “double pressure,” the stomach may experience pain, nausea, or even develop conditions like gastritis or peptic ulcers. 

Antifragility Drugs (for Osteoporosis) When combined with coffee, these medications may worsen osteoporosis. Caffeine accelerates calcium excretion from the body and reduces calcium absorption, leading to bone density loss. For patients taking antiresorptive drugs like alendronate sodium or calcium carbonate, coffee intake can impair drug absorption, reduce therapeutic efficacy, and exacerbate calcium depletion. Diuretic Antihypertensives Consuming coffee alongside diuretic antihypertensives creates a “double-diuretic” effect. Diuretics (e.g., furosemide, spironolactone, hydrochlorothiazide) are a core class of blood pressure medications. Since caffeine also has diuretic properties, combining them amplifies fluid loss, potentially causing excessive depletion of potassium and sodium ions—leading to electrolyte imbalances. Moreover, caffeine’s blood-pressure-elevating effect counteracts the antihypertensive action of these drugs. Thyroid Hormone Medications Coffee reduces the efficacy of thyroid hormone drugs. For example, levothyroxine sodium absorption in the gut can decrease by approximately 50% when taken with coffee, significantly weakening therapeutic effects. Quinolone Antibiotics Co-administration with coffee may increase adverse reactions. Caffeine can intensify quinolone antibiotics’ (e.g., levofloxacin, moxifloxacin) impact on the central nervous system, triggering symptoms like headaches or dizziness. Sleep Aids Coffee directly opposes the action of sleep medications. For patients using benzodiazepines (e.g., diazepam) or non-benzodiazepine hypnotics (e.g., estazolam), coffee intake can cancel out the sedative effects, undermining treatment goals. Resolving Conflicts Between Coffee and Medications While coffee boosts alertness, it can interfere with drug absorption and metabolism. Long-term medication users should consult their doctors about coffee consumption and recommended intake levels. If you’re currently taking medications, follow these three guidelines when drinking coffee: Practical Guidelines to Resolve Coffee-Medication Conflicts Maintain a Time Gap Between Medication and Coffee For medications prone to interacting with coffee, avoid drinking coffee 1–2 hours before or after taking the drug. This interval minimizes direct interference with drug absorption and metabolism. Control Caffeine Intake Daily caffeine consumption should generally not exceed 400 mg, roughly equivalent to 2–3 cups (240 mL each) of regular coffee. Special populations—including those with liver dysfunction or the elderly—metabolize caffeine more slowly and should reduce intake, ideally avoiding coffee entirely during medication use. Use Room-Temperature Water to Take Medications Always take medications with room-temperature plain water to ensure optimal efficacy. Additionally, patients on medications should monitor their body’s response after coffee consumption, including heart rate, sleep quality, and mental state. If discomfort arises, adjust coffee intake or consult a doctor promptly. （Looking Forward to the New Era）