For many of us, the day doesn't start until we've had our first cup of coffee . It's comforting, energising, and one of the most widely consumed beverages in the world.

But while your morning brew might feel harmless, it can interact with certain medicines in ways that reduce their effectiveness – or increase the risk of side-effects.

From common cold tablets to antidepressants, caffeine 's impact on the body goes far beyond a quick energy boost. Tea also contains caffeine but not in the same concentrations as coffee, and doesn't seem to affect people in the same way.

Here's what you should know about how coffee can interfere with your medications – and how to stay safe.

1. Cold and flu medicines

Caffeine is a stimulant, which means it speeds up the central nervous system. Pseudoe

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