Minoxidil Results: What the Trials Report by Timepoint

Disclosure: PrescribedRX sells its own treatments, so we compete with some of the companies covered here, and we may earn affiliate commissions.

Short answer: How long does minoxidil take to work? Our minoxidil vs finasteride comparison covers how the two treatments differ; on timing, the Men’s Rogaine 5% foam Drug Facts label says “results may occur at 2 months with twice a day usage,” that some men may need to use it “for at least 4 months” before seeing results, and to stop and ask a doctor if there is no regrowth in 4 months (Rogaine foam label). The trials cited on this page measured hair at 16, 24 and 48 weeks, and one small study followed men for 96 weeks. The label also says continued use is needed to keep any regrowth.

Below, each timepoint is tied to the label or trial that reported it, so you can see what was actually measured and when.

How long does minoxidil take to work?

The labels give a range of 2 to 4 months. Both the Men’s Rogaine 5% foam and the Men’s Rogaine Extra Strength 5% solution labels use the same wording (foam label; solution label):

• “It takes time to regrow hair. Results may occur at 2 months with twice a day usage.”
• “For some men, you may need to use this product for at least 4 months before you see results.”
• “The amount of hair regrowth is different for each person. This product will not work for all men.”
• Stop use and ask a doctor if “you do not see hair regrowth in 4 months.”

The labels also say “using more or more often will not improve results,” and that the product is for hair loss on the top of the scalp (the vertex). Both labels say 5% minoxidil “is not intended for frontal baldness or receding hairline.”

Minoxidil results timeline: what each source measured

This table lists only timepoints that a label or a published study reported.

Timepoint	Source	What was measured	What it reported
3 to 6 weeks	Minoxidil tablets prescribing information (blood pressure use)	Body hair growth	Thicker, darker body hair in about 80% of patients, developing within 3 to 6 weeks
2 months	Rogaine 5% foam and solution labels	Label directions	“Results may occur at 2 months with twice a day usage”
4 months	Rogaine 5% labels	Label directions	Some men may need at least 4 months; stop and ask a doctor if no regrowth by 4 months
16 weeks	Olsen 2007, 5% foam vs placebo, 352 men	Hair counts	Hair counts rose more with foam than placebo (P < .0001)
24 weeks	Penha 2024, oral 5 mg vs topical 5%, 90 men	Hair density, photos	Authors reported oral not superior to topical overall; oral ahead on vertex photos
48 weeks	Olsen 2002, 5% vs 2% vs placebo, 393 men	Hair counts, ratings	Authors reported 5% superior to 2% and placebo, with earlier response on 5%
96 weeks	Price 1999, 36 men	Hair weight and counts	About a 30% increase in hair weight over baseline, maintained over 96 weeks
24 weeks after stopping	Price 1999	Hair weight and counts	Returned to about placebo levels

Sources are linked in each section below and listed at the end.

Weeks 3 to 6: what the tablet prescribing information says about body hair

This row is about oral minoxidil taken for blood pressure, not a scalp result. The minoxidil tablets prescribing information says elongation, thickening and darkening of fine body hair “are seen in about 80% of patients” and that this “develops within 3 to 6 weeks after starting therapy,” usually first on the temples, between the eyebrows or on the upper cheeks (minoxidil tablets prescribing information).

Week 16: the foam trial

In a 16-week trial of 352 men aged 18 to 49, hair counts rose significantly more with 5% minoxidil foam than with placebo (P < .0001), and so did the men’s own ratings of their hair loss (P < .0001). The authors note there was “no collection of efficacy data beyond 16 weeks”; 143 men continued in an open-label phase that collected 52 weeks of safety information (Olsen et al., 2007). The foam label adds that hair growth “has been shown in a clinical study of men (mostly white) aged 18-49 years who used it for 4 months.”

Week 24: oral vs topical

A Brazilian trial randomized 90 men to oral minoxidil 5 mg daily or topical 5% minoxidil twice daily for 24 weeks; 68 finished. The authors concluded that oral minoxidil “did not demonstrate superiority” over topical. On photos, oral was ahead on the vertex (24%; P = .04) but not the front of the scalp. In the oral group, 49% reported unwanted body hair growth and 14% headache (Penha et al., 2024).

A 2022 network meta-analysis of 23 studies reported that at 24 weeks, the largest gain in terminal (thick) hair count was with oral minoxidil 5 mg a day, ahead of topical 5% by a mean of 29.8 hairs per square centimeter (Gupta et al., 2022). That analysis pooled separate studies rather than testing the doses head to head.

What do 1-year minoxidil results look like in trials?

The main 1-year trial randomized 393 men aged 18 to 49 to 5% solution, 2% solution or placebo, applied twice daily for 48 weeks. The authors reported that 5% was superior to both 2% and placebo on hair counts and on patient and investigator ratings, with “45% more hair regrowth than 2% topical minoxidil at week 48.” They also reported that response “occurred earlier” with 5% than 2%, and more itching and local irritation with 5% (Olsen et al., 2002).

The Men’s Rogaine Extra Strength solution label puts a limit on that: “hair regrowth has not been shown to last longer than 48 weeks in large clinical trials with continuous treatment with 5% minoxidil topical solution for men” (solution label).

Week 96: the longest study here

A small UCSF study followed 4 groups of 9 men (5% solution, 2% solution, placebo or no treatment) for 120 weeks. The authors reported that topical minoxidil “induced and maintained an increase in interval weight over baseline of about 30%” over 96 weeks, measured by hair weight. Hair counts were “usually less significant” than weight (Price et al., 1999). With 9 men per group, this is a small study.

Minoxidil before and after: what the trial measurements mean

This page does not show before-and-after photos. The trials above used set measurements:

• Hair counts in a marked target area of the scalp, sometimes split into thick (terminal or nonvellus) and fine hairs (Olsen 2002; Penha 2024).
• Hair weight alongside hair counts (Price 1999).
• Standardized photos rated by investigators or panels (Penha 2024).
• Patient ratings of scalp coverage and benefit (Olsen 2002; Olsen 2007).

Where the hair was measured matters too. As noted above, the 5% Rogaine labels cover the top of the scalp only (foam label). In the oral vs topical trial, photo results differed between the vertex and the front of the scalp (Penha 2024).

What happens if you stop minoxidil?

Both Rogaine labels say “continued use is necessary to increase and keep your hair regrowth, or hair loss will begin again” (solution label). In the UCSF study, after treatment stopped at week 96, hair weight and counts in the minoxidil groups “returned to about the same levels as placebo in 24 weeks” (Price et al., 1999).

For the tablets, the prescribing information says that on stopping, new body hair growth stops, “but 1 to 6 months may be required for restoration to pretreatment appearance” (minoxidil tablets prescribing information).

Is the timeline different for oral minoxidil?

The minoxidil tablets prescribing information covers use for high blood pressure that is not manageable with other blood pressure drugs (minoxidil tablets prescribing information). Using low-dose tablets for hair loss is off-label.

The only head-to-head trial on this page, Penha 2024, compared both forms at 24 weeks, and its authors reported that oral minoxidil did not demonstrate superiority over topical. Reported reactions are covered in our guide to oral minoxidil side effects.

How does the minoxidil timeline compare with finasteride?

The Propecia (finasteride 1 mg) prescribing information says “daily use for three months or more is necessary before benefit is observed,” and that stopping “leads to reversal of effect within 12 months” (Propecia prescribing information). In the 2022 network meta-analysis, the largest gain in terminal hair count at 48 weeks was with finasteride 1 mg, ahead of topical 5% minoxidil by a mean of 26.2 hairs per square centimeter (Gupta et al., 2022).

For more on finasteride, read our guide to finasteride for hair loss. For how the Rogaine brand compares with a telehealth service, see Hims vs Rogaine.

When should you stop and talk to a doctor?

The Rogaine 5% labels say to stop use and ask a doctor if any of these occur (foam label):

• Chest pain, rapid heartbeat, faintness or dizziness.
• Sudden, unexplained weight gain, or swelling of the hands or feet.
• Scalp irritation or redness.
• Unwanted facial hair growth.
• No hair regrowth in 4 months.

The labels also say to ask a doctor before use if you have heart disease, and not to use the product if hair loss is sudden or patchy or you do not know its cause.

Frequently asked questions

How long does minoxidil take to work?

The Men’s Rogaine 5% labels say results may occur at 2 months with twice-daily use and that some men may need at least 4 months. They say to stop and ask a doctor if there is no regrowth in 4 months. In trials, hair counts were compared with placebo at 16 weeks (foam) and 48 weeks (solution).

What happens if I stop using minoxidil?

The Rogaine labels say continued use is necessary to keep regrowth, “or hair loss will begin again.” In a small 1999 study, hair weight and counts returned to about placebo levels within 24 weeks of stopping after 96 weeks of use.

Does minoxidil work on a receding hairline?

The 5% Rogaine labels say the product is for the top of the scalp and “is not intended for frontal baldness or receding hairline.” In the 24-week oral vs topical trial, photo assessments differed between the vertex and the front of the scalp. A licensed provider can review your pattern of hair loss.

Is oral minoxidil faster than topical?

No trial on this page compared how quickly oral and topical minoxidil work. At 24 weeks, the Penha 2024 trial found oral 5 mg “did not demonstrate superiority” over topical 5% overall. The tablets prescribing information covers use for high blood pressure; hair loss use is off-label.

Where does PrescribedRX fit?

The hair loss treatment offered through PrescribedRX is Hair We Grow, listed on its product page as finasteride plus minoxidil in one daily capsule. It is compounded. Compounded medications are prepared by licensed pharmacies and are not FDA-approved.

A licensed provider reviews your online intake and decides whether it is appropriate for you. Your provider sets the dose. Plans are self-pay, and availability varies by state. Prices as shown on prescribedrx.com in October 2026 (see what every PrescribedRX treatment costs):

Plan	Price as displayed
Hair We Grow, 3 months	3 month plan $220 · $73/mo · Billed every 3 months. Cancel anytime.
Hair We Grow, monthly	Monthly plan $90 a month

Questions about minoxidil? Talk to a licensed provider

A licensed provider can review your history and the options available in your state, and a prescription is issued only if a licensed provider determines treatment is appropriate. Explore prescription hair loss treatment online, or see hair loss treatments ranked by evidence.

Hair We Grow (finasteride and minoxidil in one daily capsule; compounded): 3 month plan $220 · $73/mo · Billed every 3 months. Cancel anytime. See the Hair We Grow plan.

Related reading: oral minoxidil: label status and studies · finasteride and minoxidil together · Finasteride Results: What the Trials Report by Timepoint · Minoxidil for Beard Growth: What Studies Report

Sources

1. DailyMed, National Library of Medicine. MEN’S ROGAINE (minoxidil 5%) unscented foam, Drug Facts (Kenvue Brands LLC). dailymed.nlm.nih.gov. Accessed Oct 2026.
2. DailyMed, National Library of Medicine. MEN’S ROGAINE Extra Strength (minoxidil 5%) unscented solution, Drug Facts (Kenvue Brands LLC). dailymed.nlm.nih.gov. Accessed Oct 2026.
3. Olsen EA, et al. A randomized clinical trial of 5% topical minoxidil versus 2% topical minoxidil and placebo in the treatment of androgenetic alopecia in men. J Am Acad Dermatol. 2002;47(3):377-385. PubMed. Accessed Oct 2026.
4. Olsen EA, et al. A multicenter, randomized, placebo-controlled, double-blind clinical trial of a novel formulation of 5% minoxidil topical foam versus placebo in the treatment of androgenetic alopecia in men. J Am Acad Dermatol. 2007;57(5):767-774. PubMed. Accessed Oct 2026.
5. Price VH, Menefee E, Strauss PC. Changes in hair weight and hair count in men with androgenetic alopecia, after application of 5% and 2% topical minoxidil, placebo, or no treatment. J Am Acad Dermatol. 1999;41(5 Pt 1):717-721. PubMed. Accessed Oct 2026.
6. Penha MA, et al. Oral minoxidil vs topical minoxidil for male androgenetic alopecia: a randomized clinical trial. JAMA Dermatol. 2024;160(6):600-605. PubMed. Accessed Oct 2026.
7. Gupta AK, et al. Relative efficacy of minoxidil and the 5-alpha reductase inhibitors in androgenetic alopecia treatment of male patients: a network meta-analysis. JAMA Dermatol. 2022;158(3):266-274. PubMed. Accessed Oct 2026.
8. DailyMed, National Library of Medicine. Minoxidil tablets prescribing information (American Health Packaging). dailymed.nlm.nih.gov. Accessed Oct 2026.
9. DailyMed, National Library of Medicine. PROPECIA (finasteride) tablets prescribing information (rev. 11/2023). dailymed.nlm.nih.gov. Accessed Oct 2026.

This article is for general information. It is not medical advice and it is not a recommendation for any particular treatment. Whether a treatment is appropriate for you is a decision for a licensed clinician who has reviewed your health history and current medications.