Finasteride Side Effects in Women

Key Takeaways:

• Finasteride can be prescribed off-label to treat female pattern hair loss (FPHL), but it is not FDA-approved for women.

• Side effects in women range from mild (like headaches or acne) to serious (such as breast tenderness or allergic reactions).

• Pregnant women should never take finasteride because of the risk of birth defects.

• Alternatives like minoxidil, supplements, and hair care products may be FDA-approved or lower-risk options for women.

• Always consult with a healthcare professional before starting or changing any hair loss treatment.  
  

Finasteride is one of the many hair loss treatments on the market. While the medication may slow down hair loss in women, its safety profile is better established in men.  

Common finasteride side effects in women include sexual side effects, changes in menstrual cycles, or breast-related symptoms. More rarely, allergic reactions can occur. And if you’re pregnant or planning to become pregnant, finasteride is completely off-limits due to the risk of birth defects.

Let’s break down what finasteride is, how it works, and what side effects women should know about before considering it as a hair loss treatment.

Finasteride, sold under the brand names Propecia^® (for hair loss) and Proscar^® (for benign prostatic hyperplasia, or BPH), is a 5-alpha reductase inhibitor. It works by reducing levels of dihydrotestosterone (DHT), the hormone linked to male pattern baldness and female pattern hair loss.

By reducing DHT levels, finasteride helps slow down hair loss.

The U.S. Food and Drug Administration (FDA) has approved oral finasteride for male pattern hair loss — but it isn’t approved for women. Topical finasteride also exists, although it’s not FDA-approved. 

However, some healthcare professionals prescribe oral or topical finasteride off-label to women with female pattern hair loss, but only if they determine it to be safe. 

Hers offers access to finasteride and minoxidil hair growth spray for menopausal women, only if prescribed by a healthcare professional.

The finasteride side effects in women range from mild to serious. 

Common finasteride side effects include:

• Decreased libido (low sex drive)

• Irregular menstruation

• Headaches 

• Dizziness

• Acne

• Folliculitis (inflamed hair follicles)

• Increased body hair growth

Less common but serious side effects include:

• Breast tenderness, enlargement, or lumps

• Allergic reactions (hives, facial swelling, difficulty swallowing or breathing)

• Mood changes (rare, but reported in some studies as “post-finasteride syndrome”)

The most serious risk of finasteride for women is birth defects.

Finasteride should never be used by pregnant women. Exposure can cause serious birth defects in male fetuses. If you’re pregnant, planning pregnancy, or breastfeeding, avoid finasteride entirely.  

Finasteride isn’t a one-size-fits-all hair loss treatment. In fact, there are certain groups of women who should avoid it altogether.

You shouldn’t use finasteride if you:

• Are pregnant or planning to become pregnant

• Are breastfeeding

• Aren’t using reliable birth control

• Have a history of allergic reactions to finasteride

• Have hormone-sensitive conditions

• Have a history of breast cancer

Overall, finasteride is generally considered safer for postmenopausal women who don’t have any of the above-mentioned health conditions. This is partly why it’s sometimes prescribed for postmenopausal hair loss.

If the potential side effects of finasteride give you pause, there are other hair loss treatments worth exploring. Some of these treatments can be combined to promote healthy hair growth from multiple angles. 

Popular treatment options for women include:

• Topical minoxidil. Minoxidil is FDA-approved for the treatment of female pattern hair loss. Available as foam or solution, minoxidil promotes hair regrowth and slows loss. 

• Hair growth supplements. Nutrients like biotin may help if a deficiency contributes to thinning.

• Spironolactone. This is a prescription medication that can help with hormonal hair loss.

• Red light therapy. Treatments that use low-level laser therapy to promote hair growth.

• Hair transplants. A surgical option for severe thinning or baldness.

• Thickening hair care. Products like thickening shampoos and conditioners can improve the look of thinning hair.

Not sure which hair loss treatment is best for you? A healthcare professional can help you weigh the pros and cons of finasteride and explore alternative treatments, if needed.

While finasteride may help some women slow hair loss and even see hair regrowth, it comes with potential risks and side effects. 

• Finasteride is not FDA-approved for women, but it may be prescribed off-label for the treatment of female pattern hair loss.

• Some women experience mild side effects like headaches, while others may face more concerning changes like breast tenderness or allergic reactions.

• Finasteride should never be used during pregnancy. It’s associated with birth defects in male fetuses. Avoid finasteride if you’re pregnant, breastfeeding, or trying to conceive. 

For women considering finasteride treatment, the key is informed choice. A healthcare professional can help you understand the risks and benefits of finasteride. 

If you’re ready to take the first step in addressing your hair loss, we can help you connect with a healthcare provider. Take our quiz to get started today.  

What is the most common side effect of finasteride in women?

Decreased libido (low sex drive) and headaches are some of the most commonly reported side effects in women taking oral finasteride.

Can finasteride cause breast cancer or prostate cancer?

Current research hasn’t shown a direct link between finasteride and breast or prostate cancer, but more studies are needed. Women who notice breast changes should seek medical advice promptly.

Is topical finasteride safer than oral finasteride for women?

Topical formulations may reduce the risk of systemic side effects, but they can still cause scalp irritation and, in rare cases, systemic effects.

Can postmenopausal women take finasteride?

Yes, some healthcare professionals prescribe it off-label for postmenopausal women with androgenetic alopecia, but safety and effectiveness data are limited.

Is minoxidil better than finasteride for women?

Topical minoxidil is FDA-approved for women and generally considered the first-line treatment for female hair loss. Finasteride is used off-label and may be considered if minoxidil alone isn’t effective.