Final answer:
A list of possible unpleasant or dangerous secondary effects is known as adverse reactions and side effects. These can range from minor to severe and can include contraindications and interactions, which relate to when a medication should not be used and how it reacts with other substances, respectively.
Step-by-step explanation:
A list of possible unpleasant or dangerous secondary effects, other than the desired effect, is known as adverse reactions and side effects. These side effects can range from minor issues to severe and potentially irreversible conditions. It is important to distinguish between side effects, which are generally known and listed as possible outcomes of taking a medication, and adverse reactions that may be more serious and unintended. Contraindications and interactions are different concepts: contraindications are specific situations where a medication should not be used because it could be harmful, and interactions are how the medication might react when taken with other substances.