What is the term for two drugs working together to produce an effect greater than their individual effects?

The term for two drugs working together to produce an effect greater than their individual effects is synergism. This concept is crucial in pharmacology as it highlights how certain medications can enhance each other's effectiveness when used in combination. For example, two medications that may not have significant effects when administered separately can result in a stronger therapeutic outcome when taken together, therefore improving patient care.

In contrast, tolerance refers to a decreased response to a drug after repeated use, meaning the individual would need a higher dosage to achieve the same effect. Toxic effect pertains to harmful consequences resulting from an excessive dosage of a drug or adverse interactions, showcasing the importance of safe medication practices. NPO, which stands for "nil per os" or nothing by mouth, is a medical instruction regarding dietary restrictions before procedures and does not relate to drug interactions.