Registered Practical Nurse (RPN) Practice Test

What term describes a drug that interacts only with its specific receptors?

1. Universal

2. Selective

3. General

4. Non-specific

The correct answer is: Selective

A drug that interacts only with its specific receptors is described as "selective." This term indicates a high degree of specificity in how the drug binds to certain receptors in the body, leading to predetermined therapeutic effects while minimizing interactions with other receptors. This selectivity is crucial in pharmacology as it allows for targeted treatment, reducing the likelihood of side effects associated with drugs that interact with multiple types of receptors. When a drug is selective, it can bind effectively to its intended receptors, thus achieving a desired effect without unnecessary stimulation or blockade of other receptors. This leads to better patient outcomes and improved safety profiles for medications, making them more effective and tolerable for patients. In contrast, terms such as universal, general, or non-specific indicate a lack of selectivity, where a drug may affect multiple receptors or pathways, potentially leading to varied and less controlled therapeutic effects. In clinical practice, selective drugs are often preferred due to their more predictable and manageable responses in patients.