Finasteride

Benign Prostatic Hyperplasia (BPH)

Finasteride is commonly prescribed to treat symptoms of benign prostatic hyperplasia, also known as an enlarged prostate. In men with this condition, the prostate gland grows larger and can press against the urethra, causing various urinary problems. Finasteride helps manage these symptoms by:

• Improving urinary flow.
• Decreasing the feeling that the bladder is not completely empty.
• Reducing the need to urinate frequently, especially during the night.
• Lowering the risk of sudden urinary blockage, also known as acute urinary retention.
• Reducing the likelihood that prostate surgery will be necessary.

Male Pattern Hair Loss

This medication is also used to treat male pattern hair loss, a condition known as androgenetic alopecia. It is specifically indicated for men who are experiencing thinning hair on the top of the head or the middle of the scalp. It works by increasing hair growth and preventing further hair loss in these areas.

Important Considerations

Finasteride is only intended for use by adult men. It is not approved for use in women or children. It is not effective for treating hair loss that is not related to male pattern baldness, such as thinning caused by other medical conditions or hair loss at the temples.

Mechanism of Action

Finasteride belongs to a class of medications known as 5-alpha reductase inhibitors. It works by interfering with the way the body processes testosterone. Specifically, it blocks an enzyme called 5-alpha reductase, which is responsible for converting testosterone into a more potent hormone called dihydrotestosterone (DHT).

Effects on the Prostate

In the prostate gland, DHT is a primary driver of tissue growth. When a person has benign prostatic hyperplasia (BPH), the prostate becomes enlarged, which can squeeze the urethra and make urination difficult. By lowering the levels of DHT in the blood and the prostate tissue, finasteride helps the prostate gland shrink over time. This reduction in size helps improve urine flow and reduces other symptoms associated with BPH.

Effects on Hair Loss

For men with male pattern hair loss (androgenetic alopecia), DHT contributes to the shrinking of hair follicles on the scalp. This process eventually leads to thinner hair and hair loss. Finasteride works by significantly lowering the levels of DHT in the scalp, which helps to:

• Slow down the progression of hair loss.
• Increase the amount of hair on the scalp.
• Promote hair regrowth in some individuals.

Finasteride only works to manage these conditions as long as the medication is taken. If treatment is discontinued, DHT levels will return to their previous state, and the prostate may begin to grow again or hair loss may resume.

Common Side Effects

• Decreased sexual desire
• Difficulty achieving or maintaining an erection
• Reduction in the amount of semen released during sex
• Breast tenderness or enlargement

Serious Side Effects

Seek medical attention immediately if you experience any of the following:

• Signs of an allergic reaction, including rash, hives, itching, or swelling of the lips, tongue, face, or throat
• Changes in breast tissue, such as lumps, pain, or nipple discharge
• Mental health changes, including depression, anxiety, or suicidal thoughts
• Difficulty breathing or swallowing

Some sexual side effects, such as decreased libido or erectile dysfunction, may continue in some men even after stopping the medication. It is important to report any persistent or concerning symptoms to a healthcare professional.

Pregnancy and Handling Precautions

Finasteride is contraindicated for use in women who are or may become pregnant. The medication can cause birth defects in a male fetus. Because the drug can be absorbed through the skin, women who are pregnant or planning to become pregnant should not handle crushed or broken finasteride tablets.

Prostate Cancer Risk

Clinical trials have shown that finasteride may increase the risk of developing a more serious form of prostate cancer called high-grade prostate cancer. Additionally, finasteride lowers prostate-specific antigen (PSA) levels by approximately 50%. This effect must be considered when interpreting PSA test results, as the medication may mask the detection of prostate cancer.

Breast Changes

There have been reports of male breast cancer in patients taking finasteride. Any changes in the breast tissue, such as lumps, pain, or nipple discharge, should be reported to a healthcare provider immediately.

Mood and Mental Health

Some individuals taking finasteride have reported mood changes, including depression, anxiety, and suicidal thoughts. It is important to monitor for these symptoms during treatment.

Sexual Side Effects

Finasteride may cause sexual side effects, such as decreased libido, erectile dysfunction, or problems with ejaculation. In some cases, these symptoms have persisted after the medication was stopped.

Allergic Reactions

Hypersensitivity reactions, including rash, itching, hives, and swelling of the lips or face, have been reported. If these symptoms occur, medical attention is necessary.

Pregnancy Risks

Finasteride is not indicated for use in women. It is known to cause abnormalities in the external genitalia of a male fetus. Because the medication can be absorbed through the skin, women who are pregnant or who may become pregnant should not handle crushed or broken tablets. If a woman who is pregnant comes into contact with the active ingredient in finasteride, the area should be washed immediately with soap and water.

Breastfeeding

It is not known whether finasteride passes into human breast milk. Since the drug is not approved for use in women, its safety during breastfeeding has not been established. Individuals should consult with a healthcare provider regarding any concerns about medication exposure and breastfeeding.

Considerations for Men

Small amounts of finasteride have been detected in the semen of men taking the medication. While these levels are generally considered very low, men who are planning to father a child or whose partner is pregnant should discuss the potential risks and necessary precautions with their healthcare provider.

Available Forms

Finasteride is most commonly provided in the following form:

• Oral Tablet: This medication is typically manufactured as a film-coated tablet intended to be swallowed whole.

Compounded Formulations

While oral tablets are the standard approved form, some pharmacies may produce compounded versions of the medication, such as topical solutions or gels. However, the FDA has issued alerts regarding compounded topical finasteride, noting that these products have not been reviewed for safety, effectiveness, or quality in the same manner as approved oral tablets.

FDA Approval and Indications

The U.S. Food and Drug Administration (FDA) has approved finasteride for two specific conditions in adult men:

• Benign prostatic hyperplasia (BPH): To improve symptoms of an enlarged prostate and reduce the risk of urinary blockage or the need for surgery.
• Male pattern hair loss (androgenetic alopecia): To increase hair growth and prevent further hair loss on the scalp.

Safety Communications and Labeling

The FDA has updated the safety labeling for finasteride to include several important warnings:

• Pregnancy Risks: Finasteride is strictly contraindicated in women who are or may become pregnant. The medication can cause abnormalities in the external genitalia of a male fetus. Pregnant women should not handle crushed or broken tablets because the drug can be absorbed through the skin.
• High-Grade Prostate Cancer: While finasteride may lower the overall risk of prostate cancer, clinical data indicates it may increase the risk of developing high-grade prostate cancer, which is a more aggressive form of the disease.
• Post-Marketing Reports: The FDA has monitored reports of persistent sexual dysfunction, depression, and suicidal ideation in patients taking finasteride. Labeling has been updated to reflect these potential risks, which may persist after the drug is discontinued.

Compounded Finasteride

The FDA has issued alerts regarding compounded versions of finasteride. These products are not FDA-approved, and the agency has not reviewed them for safety, effectiveness, or quality. Consumers are advised to be aware of the risks associated with using medications that have not undergone the standard regulatory review process.

How Finasteride Works for Hair Loss

Finasteride is used to treat male pattern hair loss, also known as androgenetic alopecia. This condition typically involves a gradual thinning of the hair on the scalp, which can lead to a receding hairline or balding on the top of the head. The medication works by blocking the body's production of dihydrotestosterone (DHT), a male hormone that causes hair follicles to shrink and eventually stop producing hair.

Expectations and Results

When used for hair loss, finasteride is generally taken as a low-dose daily tablet. It is important to have realistic expectations regarding the timeline and duration of treatment:

• Timeline for results: It usually takes at least three months of daily use before any improvement in hair growth or a reduction in hair loss is visible.
• Long-term commitment: The medication must be taken continuously to maintain results. If you stop taking finasteride, the hair that grew back during treatment will likely be lost within 12 months.
• Effectiveness: While it can help regrow hair, it is most effective at treating hair loss at the crown (the top of the head) and the middle of the scalp.

Safety and Restrictions

Finasteride is intended for use by adult men only. It is not approved for use in women or children. There are specific safety precautions regarding pregnancy: women who are pregnant or may become pregnant should not handle crushed or broken tablets. The medication can be absorbed through the skin and may cause birth defects in a male fetus.