Interact is when the effects of one drug are modified by the presence of another drug. There is also an effect between the behavior of two persons.

In the psychology context, Interact refers to a model of social influence that explains how people's behavior is influenced by their interactions with others. The Interact model suggests that people's behavior is influenced by the expectations and behavior of those around them, as well as by their own personal characteristics and motivations.

The Interact model was developed by social psychologist Bibb Latané in the 1980s. It is based on the idea that people are influenced by four main factors when interacting with others: social identity, social norms, social expectations, and social comparison.

According to the Interact model, people are more likely to conform to the behavior of others if they identify with the group or if they perceive the group as having higher status or expertise. They are also more likely to conform if there are clear norms or expectations for behavior within the group, or if they are uncertain about how to behave and look to others for guidance. In addition, people may be influenced by others if they feel the need to compare themselves to others and want to be seen as similar to the group.

The Interact model is a useful tool for understanding how social influence operates in different contexts, and can be applied to a wide range of situations, including group dynamics, leadership, and marketing.