5-alpha-reductase Inhibitors: Uses and Side Effects

5-alpha-reductase inhibitors are a class of medications commonly used to treat benign prostatic hyperplasia (BPH) and male pattern baldness. They work by blocking the enzyme that converts testosterone to dihydrotestosterone (DHT).
Category
Drug
Where to get
Available by prescription at pharmacies
Prepared by Nick Harper, reviewed by Dr. David James Simpson

5-alpha-reductase inhibitors FAQ


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What is a 5-alpha reductase inhibitor?

The class of medicines called 5-alpha reductase inhibitors (5ARIs) includes finasteride and dutasteride. These medicines treat benign prostatic hypertrophy and male pattern hair loss. There is a concern that 5ARIs may increase the risk of developing a serious form of prostate cancer. What Conditions Do 5-Alpha Reductase Inhibitors Treat?

What are 5-reductase inhibitors?

Dutasteride, one of the most widely used 5α-reductase inhibitors. 5α-Reductase inhibitors ( 5-ARIs ), also known as dihydrotestosterone ( DHT) blockers, are a class of medications with antiandrogenic effects which are used primarily in the treatment of enlarged prostate and scalp hair loss.

What is a 5-alpha reductase enzyme?

The enzyme 5-alpha reductase is present in your liver, skin, and prostate. This enzyme converts some of the testosterone you produce into dihydrotestosterone (DHT). DHT plays a role in prostate growth, acne, growth of facial hair, and male pattern baldness. The 5ARIs work by suppressing the 5-alpha reductase enzyme.

How do you assess a patient's response to a 5-alpha reductase inhibitor?

Use a validated scoring system (such as the International Prostate Symptom Score [IPSS] to assess and document the person's response to treatment [ NICE, 2015 ]. What are the adverse effects of 5-alpha reductase inhibitors? 5-alpha reductase inhibitors (dutasteride and finasteride) are generally well tolerated.

What are the side effects of 5-alpha reductase inhibitors?

Frequency not known — angioedema, male infertility, palpitations, and testicular pain. After 6 months of treatment, 5-alpha reductase inhibitors can cause a decrease in mean serum prostate specific antigen (PSA) levels by approximately 50%.

5-alpha-reductase inhibitors References

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