Dose-response data was collected during the testing of drugs A and B. Drug B markedly decreases the efficacy of drug A and even increases the dose of drug A, So, drug B is:a.Partial agonistb.Inverse agonistc.Non-competitive antagonistd.Competitive antagonist
Question
Dose-response data was collected during the testing of drugs A and B. Drug B markedly decreases the efficacy of drug A and even increases the dose of drug A, So, drug B is:a.Partial agonistb.Inverse agonistc.Non-competitive antagonistd.Competitive antagonist
Solution
The correct answer is c. Non-competitive antagonist.
Here's why:
A non-competitive antagonist is a type of antagonist that reduces the efficacy of a drug and can also increase the dose of the drug. This is exactly what Drug B is doing to Drug A in the scenario you provided.
A partial agonist is a drug that binds to and activates a given receptor, but has only partial efficacy at the receptor relative to a full agonist.
An inverse agonist is a drug that binds to the same receptor as an agonist but induces a pharmacological response opposite to that agonist.
A competitive antagonist is a drug that competes with the agonist for binding to the receptor. If it binds, no response is triggered. It doesn't change the efficacy or dose of the drug.
So, based on the information given, Drug B fits the description of a non-competitive antagonist.
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