Aspirin is contraindicated in a patient who in on treatment with :
**Question:** Aspirin is contraindicated in a patient who is on treatment with:
A. Acetaminophen
B. Calcium channel blockers
C. Non-steroidal anti-inflammatory drugs (NSAIDs)
D. Antacids
**Core Concept:**
Aspirin is an antiplatelet agent that inhibits the enzyme cyclooxygenase (COX) and is commonly used for its antiplatelet and analgesic properties. It is contraindicated in certain situations to prevent unwanted side effects or complications.
**Why the Correct Answer is Right:**
Aspirin is contraindicated in patients receiving calcium channel blockers (CCBs) like nifedipine, amlodipine, etc. (Option B). This is because combining aspirin and CCBs can lead to severe hypotension due to the additive effect of vasodilation caused by both drugs.
**Why Each Wrong Option is Incorrect:**
A. Using acetaminophen (Option A) does not pose a risk when combined with aspirin, as it has no direct interaction with aspirin's mechanism of action.
C. Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or indomethacin (Option C) can cause increased risk of gastrointestinal bleeding when combined with aspirin due to the additive effects on mucosal integrity.
D. Antacids (Option D) do not interact with aspirin directly, but the risk of gastrointestinal bleeding is increased when both drugs are used due to their additive effects on mucosal integrity.
**Clinical Pearl:**
When prescribing aspirin, it is essential to consider the potential interactions with other medications, particularly those affecting gastrointestinal mucosal integrity. In such cases, alternative antiplatelet agents like clopidogrel or ticagrelor can be chosen instead of aspirin. Additionally, concurrent use of proton pump inhibitors (PPIs) can help to mitigate the increased risk of gastrointestinal bleeding associated with combined use of aspirin and NSAIDs or antacids.
**Correct Answer:**
The correct answer is C (Non-steroidal anti-inflammatory drugs), as they increase the risk of gastrointestinal bleeding when combined with aspirin due to the additive effects on mucosal integrity.