Finasteride Before and After: The Complete Guide

Commissions we earn from partner links on this page do not affect our opinions or evaluations.

Oral finasteride remains one of the most proven treatments for male pattern hair loss, backed by decades of data showing steady improvement in hair density and prevention of further thinning. However, dramatic transformation photos online can create unrealistic expectations. In the next article in this case study series, we explore what real-world results look like, how long regrowth usually takes, and how to set achievable goals for lasting, evidence-based results.

Originally approved by the FDA at a 1 mg dose, finasteride works by inhibiting the conversion of testosterone to dihydrotestosterone (DHT). DHT binds to androgen receptors in dermal papilla cells (DPCs), leading to miniaturization of hair follicles, inhibition of DPC and outer root sheath cell growth, and premature transition from the anagen (growth) to catagen (regression) phase, ultimately leading to hair loss^1,2.

Order oral finasteride today from our #1 recommended hair loss telemedicine service — Ulo

Mechanism of Action

Finasteride interrupts that process by inhibiting the enzyme 5-alpha-reductase, effectively lowering DHT levels by about 60-70% in the bloodstream and scalp³. By blocking DHT, finasteride helps protect follicles and allows many to recover their normal size and function. The result? Slower shedding, stronger hair, and gradual thickening that builds over time.

Treatment with oral finasteride substantially reduces both scalp and serum DHT levels in a dose-dependent manner, with measurable effects evident within the first month of therapy⁴. By lowering scalp DHT, the drug prevents androgen-induced follicular miniaturization, thereby supporting the preservation and enlargement of hair follicles and promoting their retention in the anagen growth phase.

In contrast to topical formulations, oral finasteride acts systemically, producing broader therapeutic effects but with a higher potential for side effects in certain more susceptible people.

Side Effects: What the Research Shows

Oral finasteride is generally well-tolerated, with most clinical evidence supporting a favorable safety profile for the majority of users. However, sexual side effects and concerns about post-finasteride syndrome (PFS) are important considerations.

Sexual Side Effects

• Sexual side effects, including reduced libido, erectile dysfunction, and ejaculatory changes, are the most commonly reported adverse reactions.
• Incidence rates vary across studies and dosages^5,6:
  • Erectile dysfunction: 3.4% to 15.8% in men on 5 mg finasteride daily (most studies use lower doses like 1 mg for hair loss).
  • Decreased libido: 2.4% to 10% of men.
  • Ejaculatory dysfunction: 0.9% to 7.7%, with higher frequencies at larger doses and for benign prostatic hyperplasia (BPH) than for AGA.
• In most cases, these side effects are mild and often resolve with ongoing use or upon discontinuation of the drug^5,7.
•  A psychological or “nocebo” component may also influence self-reported rates; patients informed about the risks are statistically more likely to experience symptoms⁷. 

Post-Finasteride Syndrome (PFS)

• PFS describes persistent sexual, physical, or psychological symptoms that reportedly continue after stopping finasteride.
• The existence and exact prevalence of PFS remain debated in the medical community. Some studies suggest that persistent sexual dysfunction may occur, but at very low rates^8,9.
• A 2025 review concluded that genetics, psychological factors, and dosage or route of administration (topical vs. oral) could play a role in susceptibility to PFS, but large-scale surveys and regulatory reviews have not established a definitive causal link for most cases⁸.

Psychological and Other

• Finasteride has also been associated with episodes of depressed mood or, very rarely, suicidal thoughts. Suicidal thoughts were present in 44% of former finasteride users compared to 3% of controls¹⁰.
• Muscle aches, loss of muscle tone/mass, fatigue, and musculoskeletal complaints are documented in observational studies and case reports¹¹.
• Rare cases of psoriasisform eruptions, vitiligo, and other cutaneous reactions have been reported^12,13.

Why Online Photos Can Be Misleading

If you’ve ever scrolled through hair loss forums or Reddit, you’ve probably seen impressive finasteride “transformations”. While these are real, they often represent the top percentage of responders (so-called “hyper responders”).

In controlled studies, the average experience looks more moderate:

• The majority of users stop or slow further loss within the first year.
• Many see visible thickening after 12-24 months.
• A smaller percentage achieves substantial cosmetic regrowth.

The takeaway? Finasteride’s real strength is in stabilizing loss and gradually improving density, not producing overnight miracles. Grounding expectations in these averages helps users stick with treatment long enough to see real benefits.

What Realistic Results Look Like

Most users fall into one of three response groups:

• Strong responders: See visible thickening and reduced thinning within 6-12 months, often with clear improvement at the crown and mid-scalp.
• Moderate responders: Experience slow but steady gains in fullness over 12-24 months.
• Minimal responders: Maintain existing hair with little regrowth, but still benefit from halting further loss⁷.

Research shows that younger men and those who start finasteride earlier, before extensive thinning, achieve the best results. One study found that men under 26 responded more strongly than older groups, while another long-term Japanese trial reported declining efficacy with later treatment initiation^8,9.

Other factors influencing success include genetic sensitivity to DHT, treatment consistency, and whether additional therapies (like topical minoxidil or microneedling) are used alongside finasteride^10,11.

What Anecdotal Results Look Like

The examples below help see what’s possible and do not represent what every user should expect. They are purely anecdotal and not independently verified by us or any qualified third party.

Case #1: Male (early 30s) 10 Months on Oral Finasteride 1.25 mg + LLLT + Daily Keto Dilution

This male, in his early 30s, opted for a 10-month protocol consisting of finasteride 1.25 mg/day, a daily shampoo containing ketoconazole 2% diluted at 1:3 with aloe, and 2-3 weekly sessions with a red light therapy hat at 660 nm + 850 nm. 

In months 2-3, the user reported a reduction in shedding, and by month 5, he observed regrowth at the temple. He reported a decrease in baseline libido at months 7-9, but by month 10, it was back toward baseline. Apart from the above-mentioned sexual side effects, he reported slightly higher diastolic BP, but was unsure if it was treatment-related.

Case #2: Male (33) 12 Months on Oral Finasteride 1 mg Daily; Oral Minoxidil Added at Month 12

This 33-year-old male’s chosen intervention was finasteride 1 mg orally once daily for 12 months. He added oral minoxidil at month 12 (one week before the report). He reported having cut gluten and processed foods while following a balanced diet and engaging in exercise. He supplemented with a multivitamin, B-complex, zinc, probiotics, and MSM.

From months 0-11, he reported no visible changes and no initial shedding. At month 12, he noted an abrupt improvement in density and a healthier look overall, leading him to add oral minoxidil to build on the gains. He reported no systemic side effects but instead noted improved cognition with less brain fog, which he attributed to his lifestyle cleanup.

Case #3: Male (23) 12 Months on Finasteride Only with Gradual Up-Titration

This 23-year-old male opted for oral finasteride with gradual dose escalation as follows: 0.25 mg/day for the first 4 months, 0.5 mg/day for the next 7.5 months, and recently 1 mg/day. The user reported starting at an initial daily finasteride dose of 1 mg, which he promptly paused after experiencing mental side effects like anger and irritability. 

He noted a brief shedding period around months 8-9, followed by recovery. Through month 12, he reported gradual frontal thickening and maintenance of the loss stabilization. Having moved to 1 mg finasteride daily, he is now considering adding minoxidil and/or switching to dutasteride. He reported no systemic side effects apart from the abovementioned mental issues at the start of therapy. 

Case #4: Male (38) 12 Months on Oral Finasteride 1 mg Daily + Topical Minoxidil 5% twice daily + Biotin/Multivitamin

This 38-year-old followed a protocol including oral finasteride 1 mg daily and minoxidil 5% liquid 1 mL for 12 months. Supplementation included biotin and a multivitamin.

He reported clear cosmetic improvement and continued to notice new growth in the frontal area. Overall, he perceived a favorable outcome, describing it as “turning back the clock by years.” He also reported making significant progress in increasing global density and achieving a more visually prominent hairline, though he had not yet achieved full reversal. He reported no systemic side effects.

Case #5: Male (31) 7 Years Total on Finasteride 1 mg Daily + Oral Minoxidil up to 5 mg then 2.5 mg Daily + Topical Minoxidil 5 Percent Daily + Microneedling Weekly

This man, in his 30s, began taking prescription finasteride 1 mg daily. He subsequently added oral minoxidil at 5 mg/day, which he reduced to 2.5 mg/day due to side effects, while also using topical minoxidil 5% daily and performing weekly microneedling with a dermapen at 0.75–1.0 mm.

He reported steady improvement over the next 2 years. In years 6-7, he added oral minoxidil and weekly microneedling, achieving increased density and coverage at the temples and sideburns. He maintained his improvement after dropping the oral minoxidil dose to 2.5 mg/day. His side effects on 5mg/day oral minoxidil included headaches, palpitations, fatigue, and an increase in resting heart rate, which resolved after reducing the dose. 

Case #6: Male (28) 12 Months on Oral Finasteride + Oral Minoxidil 2.5mg Daily

This male, in his late 20s, initiated treatment with daily oral finasteride (dose unspecified) and, 5 weeks thereafter, added oral minoxidil 2.5 mg once nightly. He previously supplemented this regimen with pumpkin seed oil, biotin, and collagen, but stopped 2–3 months before the report without any change noted. 

In week 3 of therapy (finasteride only), the user noted a heavy shedding phase that lasted into month 3.5, before stabilizing. He noted the first visible improvement in months 4-5, and steady thickening without any further shedding between months 6-12. Overall, he reported an apparent increase in global density, with a fuller hairline and top compared to baseline. He responded well to the finasteride and minoxidil combination after the initial shedding period. He reported no side effects. 

Case #7: Male (20) 4 Months on Oral Finasteride + Oral Minoxidil 2.5 mg Daily

This 20-year-old male’s intervention included daily oral finasteride (dose not disclosed) and oral minoxidil 2.5 mg daily, prescribed by his dermatologist. He mentioned no use of topicals or microneedling. As of month 4, he reported improved hair growth compared to baseline, with a noticeably denser crown. He reported no side effects or any structural shedding since starting treatment. 

Case #8: Male (26) 2 Years on Oral Finasteride 1 mg Daily + Oral Minoxidil 2.5 mg Daily

This 26-year-old male chose an intervention of oral finasteride 1 mg daily and minoxidil 2.5 mg daily. He had used topical minoxidil first but switched to oral for optimal adherence. He reports no adjuncts or significant lifestyle adjustments. 

His first clear cosmetic improvement occurred around the 12-month mark, with continued improvements through year 2. The user reported achieving substantial global thickening and a considerably stronger hairline. He reported no side effects or shedding, even when switching from topical to oral minoxidil. He also noted improved sexual stamina since starting treatment.

Case #9: Male (26) 6 Months on Oral Finasteride Daily + Topical Minoxidil Daily + Dermarolling Weekly

This 26-year-old male reported an intervention of oral finasteride daily, topical minoxidil daily, and dermaroller once weekly. While he specified that exactly 6 months had lapsed between the baseline photos and his update, the user did not specify the doses or concentrations of his medications, nor how long he performed dermarolling. 

The user reported an improvement in density, with some apparent patchiness, but the user was satisfied overall and hoped it would fill in over time. He noted low libido and sore testicles for the first week of treatment, which spontaneously resolved, as the only side effects. 

Case #10: Male (39) 5 Months on Oral Finasteride 1 mg Daily + Topical Minoxidil Daily + Nizoral Weekly

This 39-year-old male’s intervention was listed as oral finasteride 1 mg daily, topical minoxidil almost daily (sometimes twice daily), and ketoconazole shampoo once per week. In the 5-month progress report, he described being discouraged early on as he continued to see hair loss in the shower. But after comparing his after photo to a baseline photo, he saw visible gains. He reported no shedding or side effects. 

Combining Treatments for Stronger Results

While finasteride alone is powerful, combining it with complementary therapies can lead to more noticeable improvement. 

Oral Finasteride + Oral Minoxidil

In a large, real-world cohort study (n=502), adult men with AGA received daily oral finasteride and oral minoxidil for 12 months¹⁹. 

• Over 92% achieved stable or improved hair density over the year, with 57% showing marked visible improvement.
• Notably, those with more severe baseline hair loss often experienced equal or greater gains, suggesting synergy and benefit even in advanced cases.
• Meaningful improvements were observed compared to either treatment alone. 

Oral Finasteride and Topical Minoxidil

Systematic reviews and meta-analyses have confirmed higher efficacy when finasteride is combined with minoxidil compared to monotherapy, regardless of whether minoxidil is oral or topical20.

• Clinically meaningful improvements in hair density, diameter, and global photographic assessments were observed across several RCTs with combination therapy.

Other Treatments

Some studies have explored finasteride with additional treatments:

• Adding low-dose finasteride to ongoing finasteride treatment led to a dramatic increase in hair density in a patient whose response to finasteride had plateaued²¹.
• Combining low-level laser therapy with oral finasteride resulted in significantly better hair count, hair diameter, and patient satisfaction than finasteride alone, with no serious side effects reported^22,23.

The Typical Finasteride Journey: Month-by-Month

Months 0-3: Finasteride begins lowering DHT levels. Some users experience a brief shedding phase as weaker hairs fall out to make room for healthier growth.

Months 3-6: Shedding slows noticeably. Hair may feel thicker at the base, and the scalp often appears less sparse under bright light.

Months 6-12: Visible improvements start to appear, particularly in the crown and mid-scalp. Hair texture and volume improve gradually.

Months 12-24: The “peak response” phase. Most users reach their maximum density and stabilization, with some experiencing continued subtle gains. 

Beyond 24 months: Maintenance mode. Continued use keeps DHT suppressed and preserves the results. Stopping treatment typically results in a slow return to baseline within 6-12 months. 

This slow, steady trajectory can be frustrating for impatient users, but consistency is everything. The men who see the best long-term results are those who stick with treatment daily for years, not months.

Because these changes happen gradually, it’s easy to underestimate progress. The best way to track results is by taking consistent photos with the same lighting and the same angles every few months.

Many users also find it helpful to use digital scalp analysis tools or dermatology check-ins every 6-12 months to document objective changes in density. Even small gains in coverage often translate into big visual improvements once hair shafts thicken and blend better. 

Practical Takeaways

• Proven and predictable: Finasteride remains the most well-studied DHT blocker for AGA.
• Best for early-stage hair loss: Starting treatment earlier typically yields better, more visible outcomes.
• Combination therapy works: Pairing finasteride with other treatments can boost regrowth. 
• Consistency is key: Long-term daily use is essential to maintain results.

Summary

Understanding oral finasteride results through a realistic, data-backed lens helps separate genuine progress from online exaggeration. As one of the most proven treatments for male pattern hair loss, finasteride offers consistent stabilization and gradual thickening rather than dramatic transformations. Clinical evidence shows that long-term, daily use leads to reliable improvement in density and slowing of loss, particularly when started early or combined with complementary treatments like minoxidil. By focusing on typical outcomes and staying consistent, users can set balanced expectations and achieve steady, meaningful results over time.

References

1. Kang JI, Kim SC, Han SC, et al. Hair-Loss Preventing Effect of Grateloupia elliptica. Biomol Ther (Seoul). 2012;20(1):118-124. doi:10.4062/biomolther.2012.20.1.118 
2. Zhang Y, Huang J, Fu D, et al. Transcriptome Analysis Reveals an Inhibitory Effect of Dihydrotestosterone-Treated 2D- and 3D-Cultured Dermal Papilla Cells on Hair Follicle Growth. Front Cell Dev Biol. 2021;9:724310. doi:10.3389/fcell.2021.724310 
3. Caserini M, Radicioni M, Leuratti C, Terragni E, Iorizzo M, Palmieri R. Effects of a novel finasteride 0.25% topical solution on scalp and serum dihydrotestosterone in healthy men with androgenetic alopecia. Int J Clin Pharmacol Ther. 2016;54(1):19-27. doi:10.5414/CP202467 
4. Dallob AL, Sadick NS, Unger W, et al. The effect of finasteride, a 5 alpha-reductase inhibitor, on scalp skin testosterone and dihydrotestosterone concentrations in patients with male pattern baldness. J Clin Endocrinol Metab. 1994;79(3):703-706. doi:10.1210/jcem.79.3.8077349 
5. Estill MC, Ford A, Omeira R, Rodman M. Finasteride and Dutasteride for the Treatment of Male Androgenetic Alopecia: A Review of Efficacy and Reproductive Adverse Effects. Georgetown Medical Review. 2023;7(1). doi:10.52504/001c.88531 
6. Mondaini N, Gontero P, Giubilei G, et al. Finasteride 5  mg and Sexual Side Effects: How Many of these are Related to a Nocebo Phenomenon? The Journal of Sexual Medicine. 2007;4(6):1708-1712. doi:10.1111/j.1743-6109.2007.00563.x 
7. Mysore V. Finasteride and sexual side effects. Indian Dermatol Online J. 2012;3(1):62. doi:10.4103/2229-5178.93496 
8. Trüeb RM, Luu NNC, Caballero-Uribe N, Dias RG, Rezende HD. Comment on Current Investigations into the Postfinasteride Syndrome. Int J Trichology. 2024;16(1-6):6-12. doi:10.4103/ijt.ijt_122_21 
9. Irwig MS, Kolukula S. Persistent sexual side effects of finasteride for male pattern hair loss. J Sex Med. 2011;8(6):1747-1753. doi:10.1111/j.1743-6109.2011.02255.x 
10. Irwig MS. Depressive symptoms and suicidal thoughts among former users of finasteride with persistent sexual side effects. J Clin Psychiatry. 2012;73(9):1220-1223. doi:10.4088/JCP.12m07887 
11. Al-Harbi TM, Kagan J, Tarnopolsky MA. Finasteride-induced myalgia and HyperCKemia. J Clin Neuromuscul Dis. 2008;10(2):76-78. doi:10.1097/CND.0b013e3181873cca 
12. Motofei IG, Rowland DL, Georgescu SR, et al. Post-Finasteride Adverse Effects in Male Androgenic Alopecia: A Case Report of Vitiligo. Skin Pharmacol Physiol. 2017;30(1):42-45. doi:10.1159/000455972 
13. Muddebihal A, Khurana A, Kulhari A, Ahuja A. Psoriasiform Drug Eruption to Finasteride: Uncommon Side Effect of a Commonly Used Drug. Int J Trichology. 2022;14(6):216-217. doi:10.4103/ijt.ijt_42_21 
14. Dhurat R, Mathapati S. Response to Microneedling Treatment in Men with Androgenetic Alopecia Who Failed to Respond to Conventional Therapy. Indian Journal of Dermatology. 2015;60(3):260. doi:10.4103/0019-5154.156361 
15. Camacho FM, García‐Hernández MJ, Fernández‐Crehuet JL. Value of hormonal levels in patients with male androgenetic alopecia treated with finasteride: better response in patients under 26 years old. Br J Dermatol. 2008;158(5):1121-1124. doi:10.1111/j.1365-2133.2008.08509.x 
16. Yoshitake T, Takeda A, Ohki K, et al. Five-year efficacy of finasteride in 801 Japanese men with androgenetic alopecia. The Journal of Dermatology. 2015;42(7):735-738. doi:10.1111/1346-8138.12890 
17. Hu R, Xu F, Sheng Y, et al. Combined treatment with oral finasteride and topical minoxidil in male androgenetic alopecia: a randomized and comparative study in Chinese patients. Dermatologic Therapy. Published online 2015. doi:10.1111/dth.12246 
18. Keene S, Goren A. THERAPEUTIC HOTLINE: Genetic variations in the androgen receptor gene and finasteride response in women with androgenetic alopecia mediated by epigenetics. Dermatologic Therapy. Published online 2011. doi:10.1111/j.1529-8019.2011.01407.x 
19. Johnson H, Huang D, Clift AK, Bersch-Ferreira Â, Guimarães GA. Effectiveness of Combined Oral Minoxidil and Finasteride in Male Androgenetic Alopecia: A Retrospective Service Evaluation. Cureus. 2025;17(1):e77549. doi:10.7759/cureus.77549 
20. Li Y, Huang Q, Zhou Z, Zhang Y. Comparing minoxidil-finasteride mixed solution with minoxidil solution alone for male androgenetic alopecia: a systematic review and meta-analysis of randomized controlled trials. Front Med (Lausanne). 2025;12:1632139. doi:10.3389/fmed.2025.1632139 
21. Boyapati A, Sinclair R. Combination therapy with finasteride and low-dose dutasteride in the treatment of androgenetic alopecia. Australas J Dermatol. 2013;54(1):49-51. doi:10.1111/j.1440-0960.2012.00909.x 
22. Dai R, Yang X, Su Y, Wu X. Effectiveness and safety of the ablative fractional 2940-nm Er: YAG laser for the treatment of androgenetic alopecia. Lasers Med Sci. 2024;39(1):128. doi:10.1007/s10103-024-04074-3 
23. Vanaria RJ, Chaudry A, Nestor MS. The Use of Light‐Based Therapies in the Treatment of Alopecia. J Cosmet Dermatol. 2025;24(9):e70434. doi:10.1111/jocd.70434