👉 In medicine, a "proaction" is a biological or pharmacological effect that occurs when a drug or other substance acts as an antagonist to another substance. This can occur in two ways: 1. When the drug binds to its receptor on a target cell and blocks the function of the receptor, preventing the binding of the second substance. 2. When the drug binds to its receptor on a target cell and causes an increase in the activity of the receptor, leading to the activation of another pathway or
