Which are the three classes of drug interactions?

The three classes of drug interactions are pharmacodynamic, pharmacokinetic, and pharmaceutic.

Pharmacodynamic interactions occur when two drugs have similar or opposing effects on the body, influencing their efficacy and safety. This can lead to enhanced therapeutic effects or increased side effects depending on how the drugs interact with each other's mechanisms of action.

Pharmacokinetic interactions involve changes in the absorption, distribution, metabolism, or excretion of a drug due to the presence of another drug. For example, one drug might affect the liver enzyme activity that metabolizes another drug, leading to altered blood levels and potentially resulting in adverse effects or therapeutic failures.

Pharmaceutic interactions refer to changes that occur before the drug is administered, specifically during drug formulation or in the preparation phase, such as incompatibility of drugs when mixed in a solution or changes in their physical or chemical properties.

The other choices do not accurately represent the recognized classes of drug interactions. For example, while therapeutic, toxic, and allergic might relate to the effects of drug interactions, they do not categorize how drugs interact with each other in terms of pharmacological principles. Similarly, chemical, physical, and pharmacological might touch on aspects of drug behavior but do not constitute the main classes of interactions that