Finasteride for Hair Loss: A Complete, Evidence-Based Guide

Hair loss can be frustrating, confusing and emotionally taxing – especially when you’re looking to identify evidence-based treatments from all the online noise. Among the many available treatment options, Finasteride remains one of the most researched and effective medical treatments for androgenetic alopecia in both and female pattern hair loss.

Multiple clinical trials and reviews have documented the mechanism of action and efficacy of Finasteride.

This guide will explain how Finasteride works, what you can realistically expect in regards to results, who is an ideal candidate for Finasteride, and how it can fit into your long-term hair preservation plan. We’ll also address common concerns, misconceptions, and questions patients have about Finasteride before starting treatment.

The background information regarding androgenetic alopecia and a treatment approach is based upon dermatological consensus.

What Is Finasteride?

Finasteride is a prescription medication originally developed to treat benign prostatic hyperplasia (BPH). Approval for the treatment of androgenetic alopecia followed in the late 1990s after the drug demonstrated its ability to slow down and stabilise hair loss in male subjects.

Controlled clinical trials support Finasteride’s clinical use for the treatment of hair loss.

Finasteride targets a fundamental biological pathway involved in androgenic thinning, thereby providing a distinct mechanism of action.

How Finasteride Works For Hair Loss

Hair follicles that are affected by androgenetic alopecia respond to dihydrotestosterone (DHT) – a metabolite/break down product of testosterone that leads to follicular miniaturisation. Miniaturisation when  follicles become thinner and the growth cycle is shortened until eventually the follicle involutes or dies. .

Researchers have well documented the biochemical process by which DHT causes follicular miniaturisation.

Finasteride decreases the amount of DHT present by inhibiting the enzyme 5-alpha reductase (type II), which converts testosterone to DHT. Lower levels of DHT in the scalp help prevent the  miniaturisation of hair follicles.

Studies show that Finasteride actively inhibits type II 5-alpha reductase, thereby lowering DHT levels by almost 60%. Dutasteride however, inhibits type I and type II 5-alpha reductase, resulting in an almost 80% reduction in DHT in the scalp.

The consensus is that Finasteride preserves existing hair rather than promoting new hair growth. Many patients value stabilising hair loss over potential regrowth.

Data from long-term studies have demonstrated stabilised hair counts and a reduced rate of hair loss progression.

Will Finasteride Regrow Hair?

Clinicians more accurately characterise Finasteride as a hair-loss stabiliser rather than a guaranteed regrowth treatment. Nevertheless, clinical studies have observed that Finasteride can promote hair regrowth in certain situations, particularly when hair follicles remain active and viable.

Hair loss doctors will often emphasise the importance of maintaining existing hair rather than stimulating new hair growth with Finasteride.

That said, many individuals do experience:

  • Increased hair shaft diameter thickness
  • Improved impression of density in thinning areas
  • Partial regrowth in early hair loss areas

Clinical trials document improved hair counts and thickness compared with untreated control subjects.

Regrowth is more impressive when Finasteride is initiated early, before complete follicle miniaturisation and non-viability. As hair loss progresses, the primary advantage of Finasteride is slowing or halting further hair loss.

Data from longitudinal? studies indicate a larger benefit in early-stage thinning.

Combination therapy with Finasteride and Minoxidil may provide a more noticeable cosmetic improvement.

Research in hair restoration supports the effectiveness of combination therapy.

When Will You See Results?

Finasteride requires commitment, consistency, and patience.

Both clinicians and documentation of product instructions note that improvements often develop over several months.

Typical timeline:

3 months: Reduced shedding may begin

3–6 months: Early stabilisation or subtle thickening

6–12 months: Maximal visible benefit

Hair grows slowly and changes are incremental. If you don’t see any improvement soon after initiating treatment, it doesn’t necessarily mean that treatment isn’t working. Patience is key.

The prescribing information outlines the expected time frame for treatment response.

When to Take Finasteride

Finasteride is usually taken once daily, with or without food for oral administration. 

Product instructions and clinician guidelines recommend once-a-day dosing.

Consistency, not timing, is the most critical factor. Regularly missing doses may lead to a decline in efficacy over time. Principles of pharmacology support continued exposure to the active ingredient for maintained results.

Topical formulations are usually applied once daily to the scalp, depending on the product’s recommended concentration and formulation.

Clinical trials demonstrating the efficacy of topical Finasteride utilised daily dosing.

Oral vs Topical Finasteride

Generally speaking, oral Finasteride provides a more consistent and predictable degree of DHT suppression due to systemic absorption of the active ingredient and the delivery of a steady-state dose regardless of scalp condition or application technique. This consistency translates into more reliable long-term hair-loss stabilisation across a broader segment of the general population.

Due to formulation variability, the results of topical Finasteride may vary significantly among individuals. Factors affecting the efficacy of topical Finasteride include formulation quality, scalp absorption of the active ingredient, application accuracy, and user compliance. Although some patients may achieve comparable results, interindividual variability in topical Finasteride outcomes may undermine its reliability over time.

Convenience-wise, oral Finasteride is easier to administer and maintain, requiring only a single daily dose and virtually no handling, which may contribute to better long-term adherence compared to topical formulations, which require daily scalp application, drying time, and a consistent technique.

There is significant variation in systemic exposure to Finasteride with both topical and oral preparations. Oral Finasteride has been shown to significantly reduce systemic DHT levels, whereas topical Finasteride is formulated to limit systemic absorption. However, a small amount of systemic absorption could still occur with topical Finasteride. An individual’s tolerance for side effects,  their clinical needs or diagnosis and their willingness for a consistent daily application routine may be the determining factor in choosing between the topical and oral forms of Finasteride.

Read more about Oral vs. Topical Finasteride.

Oral Finasteride:

Most studied and widely prescribed

Consistent DHT suppression

Simple once‑daily dosing

Decades of safety data

Topical Finasteride:

Applied directly to the scalp

Lower systemic exposure therefore less risk of side effects

Helpful for patients sensitive to oral therapy

Requires daily application and careful handling

Ongoing research demonstrates the promise of topical Finasteride.

Clinical experience indicates that oral therapy is generally more reliable for long-term hair preservation, while topical formulations may be more advantageous for specific populations.

Finasteride vs Minoxidil: Do They Do the Same Thing?

No. When you begin treatment with Minoxidil and Finasteride, they produce two entirely different effects on your hair.

  • Minoxidil stimulates hair growth by improving follicle activity and prolonging the growth phase.
  • Finasteride reduces the hormonal trigger responsible for follicle miniaturisation and therefore stabilises shedding.

Because they cause these two completely different results, Minoxidil and Finasteride cannot be used interchangeably. However,, using them together can improve cosmetic outcomes compared to using either alone. MHR Hair Club’s physicians provide combination therapies such as topical sprays that contain both minoxidil 5% and finasteride 0.25%, as well as oral tablets that contain minoxidil 5mg and finasteride 1mg, or minoxidil 2.5mg and finasteride 1mg, so that patients can easily administer both products at the same time.

Several clinical trials have demonstrated the effectiveness of using both drugs simultaneously.

Why Finasteride May Not Be Working

The potential explanations for continued hair loss during finasteride treatment include:

  • Hair follicles were already significantly miniaturised at the start of treatment
  • Irregular compliance with finasteride dosing
  • Increased genetic influence on the rate of hair loss
  • Expecting regrowth rather than stabilisation

When this occurs, clinicians may re-align expectations or review the formulation, dose, or combination of treatments as options for adjustment.

Recommendations for treatment adjustments are outlined in clinical guidelines.

Are Finasteride Results Permanent?

The benefits of Finasteride are treatment‑dependent.

  • Hair loss slows or is paused during usage. 
  • Once the medication is stopped, the drug concentration decreases as its being excreted and your DHT levels increase to return to baseline.
  • The now increased DHT levels will resume miniturisation and results will revert to the pre-drug period
  • Within 3-6 months, hair loss progression usually resumes
  • Discontinuation effects have been noted in the prescribing literature for this drug.

Therefore, Finasteride can be viewed as a long-term management therapy, much like how other chronic conditions are treated.

Are Side Effects Common or Permanent?

Finasteride has a very good safety profile for most patients. Although some users experience some adverse effects ( research has reported 7%), which may include decreased libido, impotence, gynaecomastia (breast tissue stimulation in males) or low mood , these effects are usually reversible when treatment is stopped.

The vast majority of clinical trials evaluating Finasteride’s effectiveness reported low rates of adverse effects.

Although serious persistent side effects to Finasteride are rare, they do occur. Therefore, if you have experienced any adverse reactions while using this product, please stop taking it immediately and contact your prescriber.

Studies have shown that many of the side effects are not dose dependent (in contrast to minoxidil, which is dose dependent).

It is wise to attempt a short drug administration trial period to elicit any of the above side effects before committing to a regime and should be done under professional guidance. If any concerns arise, the medication should be stopped and topical application can be used as an alternative. One can decide for whatever reason to switch between oral or topical formulations without jeopardising the results. 

Prescribers might decide to change to the more potent Dutasteride if there are no side effects elicited for even better stabilisation of the hair loss. This is because the half-life of Finasteride is 36 hours, resulting in excretion over ~2 weeks and if any side effects were to occur, the drug can be stopped and these effects will wean over this period. In contrast, Dutasterides half-life is 5 weeks and is excreted over a period of ~6 months before returning to baseline.

Can Finasteride Cause Depression?

Research on the relationship between depressive moods and depression is often inconsistent, and some studies have suggested that there may be a minimal association with susceptible people; other studies, however, did not demonstrate a statistically increased risk.

People who have a history of depression/anxiety should discuss this with their clinician before taking these medications and receive appropriate monitoring.

Can Finasteride Cause Constipation?

Although there have been some reports of gastrointestinal issues that could cause constipation, it is very uncommon for patients taking Finasteride to experience constipation as a result of the medication. Other possible causes of gastrointestinal symptoms need to be evaluated by your healthcare provider.

Finasteride and fertility: What you need to know

Finasteride When Trying to Conceive

Some evidence suggests Finasteride may reduce sperm count in a small number of men. Some practitioners suggest temporarily discontinuing Finasteride while attempting to conceive and restarting if desired.

The safety information for Finasteride includes possible impacts on semen parameters.

Use During Pregnancy

All pregnant or potentially pregnant women must avoid oral and topical Finasteride because it can cause congenital abnormalities in the fetus.

The pregnancy risk is clearly stated on the labelling of the drug. Finasteride should also not be used during breastfeeding.

Can Women Use Finasteride?

Finasteride is not prescribed for women who are of childbearing age due to the teratogenic risk. There are instances where a female who has reached menopause (postmenopausal) or not wanting to conceive will be treated with Finasteride; however, this would be done on an individualised basis, and with caution, by prescribers.

FDA approval and clinical review give some insight into the role of Finasteride in the treatment of females.

Finasteride and Hair Transplants

Hair transplantation restores hair to an area that has non-viable hair follicles which fail to grow hair shafts caused by DHT driven miniaturisation. However, thinning will continue in the untreated areas with naturally occurring hair. 

Clinical practice integrates medical therapy and surgery for best results.

Finasteride is often recommended:

  • Before transplant surgery
  • After surgery to preserve naturally occurring and transplanted hair
  • To protect the donor area from on-going thinning
  • Combined strategies are supported by surgical and prescriber guidance.

Medical and surgical treatments are complementary, not mutually exclusive.

For most individuals, a comprehensive hair restoration plan should include both medication and surgical techniques.

How Much Does Finasteride Cost?

The cost of Finasteride varies depending on:

  • Brand vs generic pricing varies widely.
  • Oral vs topical formulation
  • Pharmacy/company pricing
  • Medical consultation requirements

Finasteride Cost At Medical Hair Restoration:

Medical Hair Restoration has been providing finasteride-based hair restoration products for the past 30 years, and all prescriptions issued by Medical Hair Restoration comply with the same stringent compounding standards used by pharmaceutical companies and have an extremely high success rate among the many thousands of patients it has treated since its inception.

Where to Get Finasteride Safely

Because Finasteride is a prescription medication, it should only be obtained through a qualified healthcare provider. This ensures:

  • Proper diagnosis
  • Appropriate dosing
  • Monitoring for side effects
  • Authentic medication supply

Avoid informal or unregulated sources, which may lead to counterfeit or improperly dosed products. Medical Hair Restoration fully complies with all of the above, providing safe and regulated access to Finasteride.

Commonly Prescribed Finasteride Options at MHR

At Medical Hair Restoration, finasteride prescriptions are individualised based on medical history, hair loss pattern, and treatment goals. Doctors commonly prescribe a range of evidence-based finasteride formulations, including oral and topical options, depending on suitability.

Treatment selection is guided by clinical assessment rather than a one-size-fits-all approach. This allows for flexibility in formulation choice, dosing, and combination therapy where appropriate.

Medical Hair Restoration product list:

Accessing Finasteride in South Africa

If, after understanding how Finasteride works and who it is suitable for, you decide that this treatment is for you, the next step is ensuring access through a legitimate medical provider such as Medical Hair Restoration at www.medhair.co.za and its Exclusive MHR Hair Club. Start your online consultation here or make a script request to see if you are a good candidate for Finasteride for hair loss.

For individuals looking to buy Finasteride in South Africa responsibly, choosing a regulated provider helps ensure that treatment is evidence‑based, genuine, and aligned with best medical practice.