Question

How does the inhibition of the cytochrome P450 system create a dangerous clinical risk for patients currently prescribed narrow-therapeutic-index medications?

Accepted Answer

The cytochrome P450 system is a family of enzymes in the liver responsible for metabolizing—or breaking down—drugs so they can be eliminated from the body. Some medications are narrow-therapeutic-index drugs, meaning the range between a dose that is effective and a dose that is toxic is extremely small. When a patient takes a second medication that inhibits these P450 enzymes, it effectively shuts down or slows down the &#x27;metabolic engine&#x27; that clears the first drug from the system. Imagine a clogged drain in a sink: if the water (the drug) continues to flow from the faucet at the same rate, but the drain (the enzymes) is blocked, the sink will quickly overflow. Because the narrow-therapeutic-index drug cannot be cleared at its normal rate, its concentration in the bloodstream rises rapidly, quickly surpassing the safe limit and reaching levels that can cause severe, potentially life-threatening toxicity.

How does the inhibition of the cytochrome P450 system create a dangerous clinical risk for patients currently prescribed narrow-therapeutic-index medications?

The cytochrome P450 system is a family of enzymes in the liver responsible for metabolizing—or breaking down—drugs so they can be eliminated from the body. Some medications are narrow-therapeutic-index drugs, meaning the range between a dose that is effective and a dose that....

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How does the inhibition of the cytochrome P450 system create a dangerous clinical risk for patients currently prescribed narrow-therapeutic-index medications?

The cytochrome P450 system is a family of enzymes in the liver responsible for metabolizing—or breaking down—drugs so they can be eliminated from the body. Some medications are narrow-therapeutic-index drugs, meaning the range between a dose that is effective and a dose that....

Community Answers