. Propecia (finasteride) is a synthetic steroid that...

. Propecia (finasteride) is a synthetic steroid that functions as a competitive and specific inhibitor of $5 \alpha \text { -reductase (p. } 793),$ the enzyme responsible for the synthesis of dihydrotestosterone from testosterone. (FIGURE CAN'T COPY) In addition to its use as a treatment for benign prostatic hypertrophy (Problem 21 ), finasteride is also widely used to retard the development of male pattern hair loss. Pregnant women are advised to avoid handling this drug. Why is it vitally important that pregnant women avoid contact with Propecia?

. Propecia (finasteride) is a synthetic steroid that functions as a competitive and specific inhibitor of $5 \alpha \text { -reductase (p. } 793),$ the enzyme responsible for the synthesis of dihydrotestosterone from testosterone.

(FIGURE CAN'T COPY)
In addition to its use as a treatment for benign prostatic hypertrophy (Problem 21 ), finasteride is also widely used to retard the development of male pattern hair loss. Pregnant women are advised to avoid handling this drug. Why is it vitally important that pregnant women avoid contact with Propecia?

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Key Concepts

5?-Reductase Inhibition

This concept involves the mechanism by which certain drugs inhibit the enzyme 5?-reductase, which normally converts testosterone into dihydrotestosterone. Dihydrotestosterone is a critical androgen involved in male development, so its inhibition can interfere with normal hormonal regulation and developmental processes.

Teratogenicity

Teratogenicity refers to the potential of a substance to cause developmental malformations in a fetus when exposed during pregnancy. In the context of enzyme inhibitors like finasteride, reduced levels of dihydrotestosterone can lead to abnormalities in the fetal development of male genitalia, which is why exposure in pregnant women is particularly concerning.

Drug Safety in Pregnancy

This concept concerns the evaluation and avoidance of drugs that may harm fetal development. Understanding the risks associated with medications during pregnancy, such as the potential hormonal interference from inhibitors like finasteride, is critical for protecting the developing fetus from adverse effects.

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