Ever wondered why your doctor asks if you're taking any other meds before prescribing something new? It's not just a formality. Medications can interact in ways that alter their effectiveness or cause side effects. For instance, mixing certain painkillers with anticoagulants can increase bleeding risk. Even common supplements like St. John's Wort can mess with how some drugs work. Always be upfront about everything you're taking, including over-the-counter meds and supplements. Stay safe and informed!