Which of the following drugs in habit platelet cyclooxygenase reversibly
**Core Concept**
The question is testing the student's knowledge of the mechanism of action of nonsteroidal anti-inflammatory drugs (NSAIDs) on platelet cyclooxygenase (COX). Platelet COX is responsible for the production of thromboxane A2, a potent platelet aggregator.
**Why the Correct Answer is Right**
The correct answer is a type of NSAID that selectively inhibits COX-1, the isoform present in platelets, reversibly. This selective inhibition reduces thromboxane A2 production, thereby reducing platelet aggregation. However, this reversible inhibition is a key characteristic of the correct answer, differentiating it from irreversible COX inhibitors like aspirin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is an irreversible COX inhibitor, such as aspirin, which would permanently inhibit platelet COX and increase the risk of bleeding.
**Option B:** This option is incorrect because it is a non-selective COX inhibitor, which would inhibit both COX-1 and COX-2, leading to increased risk of gastrointestinal side effects.
**Option C:** This option is incorrect because it is a COX-2 selective inhibitor, which primarily inhibits COX-2 in inflammatory tissues, but would not have a significant effect on platelet COX-1.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that while selective COX-2 inhibitors like the correct answer have a lower risk of gastrointestinal side effects, they do not reduce the risk of cardiovascular events associated with NSAID use.
**Correct Answer:** C.