What information do you need to share with your doctor to avoid a possible bad reaction to medication?

To avoid a possible bad reaction to medication, you should share your complete medical history, including any Allergies, current medications (prescription and over-the-counter), and any supplements you are taking. It's also important to inform your doctor about any pre-existing medical conditions, previous adverse reactions to medications, and your family medical history. Be honest about lifestyle factors such as alcohol or drug use, as these can impact medication effectiveness and safety. Lastly, discuss any concerns or specific symptoms you may have experienced in the past with medications.