AGA治療（内服・外用）: Downtime
Almost none Category: 薄毛治療・植毛 Last updated: 2026-07-14
AGA treatment (oral and topical medication) is drug therapy that aims to slow the progression of male pattern hair loss with oral medications such as finasteride and dutasteride, and to promote hair growth with topical minoxidil. Because no surgery or injections are involved, there is generally said to be no downtime in the sense of swelling or wounds. However, a temporary increase in hair shedding known as "initial shedding" can occur around 2 weeks to 1 month after starting treatment, and it may be easiest to think of this as the practical equivalent of downtime. In addition, some clinics prescribe oral minoxidil, but oral minoxidil has not been approved in Japan as a medication for hair growth and is prescribed as elective (non-insured) care under the responsibility of the physician — a point you should understand in advance. Because effectiveness and side effects vary greatly from person to person, see a physician before starting and discuss the treatment plan that suits you.
DowntimeVirtually no dow…
PainAlmost none
MakeupSame day, as usu…
Work / social lifeFrom the same da…
On this page
- Downtime at a glance
- Recovery timeline: treatment day to final result
- Common symptoms
- When can I do what? (Daily-life restrictions)
- Pain and anesthesia
- Tips for a smoother recovery
- Risks and side effects (the honest version)
- Spacing and combining with other procedures
- Who it may suit / who should be cautious
- Frequently asked questions
Downtime at a glance
Downtime in the sense of swelling or wounds is generally said to be absent — you can work and go out as usual from day one. The practical points to watch are initial shedding around 2 weeks to 1 month after starting, and medication side effects.
Typical downtime is Virtually no downtime (if initial shedding occurs, it typically begins around 2 weeks to 1 month after starting and is often said to settle within about 1–2 months), and most people feel comfortable being seen in public after From the same day, as usual (clinic visits are only for prescriptions and follow-up, and time off is generally said to be unnecessary). How much swelling or bruising appears varies from person to person, depending on constitution and the extent of treatment.
Recovery timeline: treatment day to final result
Day treatment starts
With both oral and topical medication, there is virtually no visible change or restriction from the very first day. Work, going out, and bathing are all fine as usual. Apply topical medication to a clean scalp as directed; it is reassuring to wait a little after application before using styling products or the hot air of a hair dryer.
Next day to a few days
Daily life is said to be completely normal. If itching or redness from the topical medication is going to appear, you may start noticing it around this time. Mild symptoms can sometimes simply be observed, but if they get worse, pause use and consult your doctor.
2 weeks to 1 month
This is when initial shedding is most likely to occur. Hair loss during shampooing or on your pillow may temporarily increase, which worries many people, but it is regarded as a transient reaction that accompanies the resetting of the hair cycle, and it is generally explained as not being a sign that the treatment is failing. Stopping on your own judgment makes it impossible to assess whether the treatment is working, so the basic approach is to continue while consulting your doctor if you are concerned.
3 months
Initial shedding settles down, and this is said to be when some people begin to notice less hair loss. Visible changes are often still small at this point, so it is a period for continuing patiently. At regular checkups, your doctor will check for side effects and look at the condition of your scalp.
6 months
This is considered one of the standard milestones for judging effectiveness. More people are said to notice less shedding, more fine new hairs, and a change in volume, though the degree of change varies from person to person. Keeping photo records of your progress makes the changes easier to confirm objectively.
1 year and beyond (maintenance)
It is common to evaluate the overall results after about a year of treatment and review the type, combination, and dosage of your medication. Because AGA is progressive, hair is said to gradually return to its previous state if you stop, even when the treatment has worked. If you wish to maintain your results, this is a treatment you continue long term in consultation with your doctor.
Bars show approximate swelling levels (individual results vary).
Common symptoms
| Symptom | Likelihood | When it appears | How long it lasts | Notes |
|---|---|---|---|---|
| Initial shedding (a temporary increase in hair loss) | Medium | Around 2 weeks to 1 month after starting | About 1–2 months | This is said to occur as old hairs are pushed out while the hair cycle resets, and it is generally explained as not being a sign that the treatment is failing. If you are worried, consult your doctor rather than stopping on your own. |
| Scalp itching, redness, or irritation (topical medication) | Medium | From a few days after starting use | While use continues (usually mild) | Contact dermatitis can occur, for example in reaction to the base ingredients of topical minoxidil. If intense itching or persistent flaking occurs, do not keep using the product — consult your doctor. |
| Reduced libido or changes in erectile function (oral medication) | Low | From a few weeks after starting the medication | Varies greatly from person to person | These are side effects listed in the package inserts for finasteride and dutasteride, reported at frequencies of a few percent or less. If you notice a concerning symptom, consult your doctor, who will judge whether it is appropriate to continue. |
| Changes in liver function values (oral medication) | Low | While taking the medication | — | Liver dysfunction has been reported in rare cases, and some medical institutions monitor for it with regular blood tests. |
| Excess hair growth, fluid retention, or palpitations (oral minoxidil) | Medium | From a few weeks after starting | While taking the medication | Besides excess hair growth — hair becoming thicker on the arms, face, and other areas beyond the scalp — fluid retention, palpitations, and drops in blood pressure can occur. Oral minoxidil is not approved in Japan, so if you are prescribed it, make sure you receive a full explanation of the risks. |
| Dizziness or lightheadedness | Low | While taking the medication | — | This can occur with medications that affect blood pressure (especially oral minoxidil). If you are taking any other medications, such as blood pressure drugs, be sure to tell your doctor in advance. |
When can I do what? (Daily-life restrictions)
| Activity | Typically OK from | Key point |
|---|---|---|
| Washing your hair | Same day, as usual | Topical medication is generally applied to a clean scalp after washing. Washing your hair right after application rinses the medication away, so follow the product directions and your doctor's instructions. |
| Hair coloring and perms | Generally no restriction (adjust the timing of topical application on the day) | On the day of a color or perm, you may be advised to skip the topical medication because the scalp is under extra stress. It is safer to avoid these treatments while your scalp shows redness or irritation. |
| Bathing (soaking) and sauna | Same day | The treatment itself imposes no restrictions. Topical medication is easily washed off by sweat or bathwater right after application, so a sensible workaround is to apply it after your bath. While taking oral minoxidil, dehydration or a drop in blood pressure can cause dizziness, so judge long sauna sessions by how you are feeling. |
| Alcohol | Often considered fine in moderation | Oral medications are metabolized by the liver, so it is considered better to avoid heavy drinking. If you have concerns about your liver function, consult your doctor beforehand. |
| Exercise | Same day | The treatment imposes essentially no restrictions. If you feel palpitations or dizziness while taking oral minoxidil, do not push through — tell your doctor about the symptoms. |
| Blood donation | Not allowed while taking the medication (and for a set period after stopping) | Blood donation is said to be off-limits for 1 month after the last dose of finasteride and for 6 months after dutasteride. If you plan to donate blood, check in advance. |
| Handling the medication at home | — (constant caution while taking it) | With finasteride and dutasteride, care is said to be needed so that women who are pregnant or may be pregnant do not touch broken tablets or leaking capsules (the ingredients can be absorbed through the skin). Be mindful of where you store them at home. |
| Trying to conceive (including a partner's pregnancy) | Decide in consultation with your doctor | Dutasteride is said to remain in the body for a relatively long time after you stop taking it. If you hope to have children, consult your doctor in advance about whether and when the medication should be paused. |
Can you hide it? Concealment difficulty ○○○○○ ／ Because there are no procedure marks or swelling, the fact that you are having treatment is almost never visible. If hair loss during the initial-shedding phase bothers you, it is said to be easy to cover with your hairstyle, styling products, or a change of parting. Topical medication is hard to notice once dry, and some products are formulated so that daytime reapplication is unnecessary. How much it bothers you varies from person to person.
Pain and anesthesia
The typical pain level is Almost none. No anesthesia is needed. Because this treatment involves only oral and topical medication, there is no procedure-related pain. Topical medication can occasionally cause stinging or itching, but this is usually said to be mild. If symptoms are strong, the product may not be right for you, so consult your doctor.
Tips for a smoother recovery
- It is considered important not to stop on your own judgment even if initial shedding occurs. Repeatedly stopping and restarting makes it hard to judge whether the treatment is working, which can end up being a detour.
- Taking photos of your head at a set time — for example once a month — in the same place under the same lighting lets you confirm changes objectively, which also helps ease anxiety.
- If a symptom appears that you suspect is a side effect, do not tough it out or reduce the dose on your own — contact the prescribing doctor early. Switching medications or adjusting the dose can often make the treatment easier to continue.
- With topical medication, following the directed usage and dose is fundamental. Applying more is not said to increase effectiveness, and it may raise the risk of skin irritation.
- Buying through personal imports or online retailers carries noted risks: counterfeit products, products of unverifiable quality, and possible ineligibility for Japan's Relief System for Sufferers from Adverse Drug Reactions if side effects occur. Getting a prescription from a medical institution, or purchasing approved over-the-counter products through proper channels, is recommended.
Risks and side effects (the honest version)
- With finasteride and dutasteride, reduced libido, decreased erectile function, ejaculation disorders, and similar effects have been reported at frequencies of a few percent or less. There are also rare reports of symptoms persisting after the medication was stopped, so consult your doctor early if you notice a concerning symptom.
- In rare cases, liver dysfunction and depressive symptoms have been reported with the oral medications. Continuing treatment alongside regular checkups and testing is recommended.
- Oral minoxidil has not been approved in Japan as a medication for hair growth (the topical form is approved). With the oral form, excess hair growth, fluid retention, palpitations, drops in blood pressure, and other effects on the circulatory system have been reported. If you are offered a prescription, decide only after receiving a full explanation of the risks and of the fact that it is an unapproved medication.
- Finasteride and dutasteride are considered contraindicated for women — especially those who are pregnant or may be pregnant — and contact with broken tablets and the like must also be avoided.
- The oral medications are known to lower PSA levels (a marker used in prostate cancer screening). Be sure to mention that you are taking them whenever you have a screening.
- Effectiveness varies greatly from person to person, and some people may not feel they see sufficient change. With medications whose main role is slowing progression, "staying the same" can itself be the benefit. Always see a physician for an examination and consultation when deciding whether to choose or continue treatment.
If a symptom lingers or gets worse, do not try to judge it yourself — contact the medical institution where you had the procedure.
Spacing and combining with other procedures
If you have an occasion where you want to look your best, such as a wedding or a photo shoot, keep two things in mind: noticeable results take around 6 months, and initial shedding may occur around the first month. Starting at least 6 months to a year in advance gives you a comfortable margin. Starting just before the event may coincide with the initial-shedding phase, so plan the schedule with your doctor. Both the oral and topical medications are continued daily, so there is no notion of an "interval until the next session." Prescriptions are usually issued together with checkups every 1–3 months, and you continue treatment while being monitored for side effects and effectiveness. Never change or adjust the medication on your own — always consult your doctor.
| Combined procedure | Timing | Wait time | Reason |
|---|---|---|---|
| Hair Transplant | Wait required | It is common to continue the oral medication before and after surgery (follow your doctor's instructions on timing) | Because a transplant is surgery that relocates hairs, continuing drug therapy is considered important for slowing the progression of loss in your existing hair. Details such as whether to pause the topical medication around surgery differ between medical institutions, so follow your doctor's instructions. |
| Scalp Injection Therapy (Hair Mesotherapy) | Wait required | Same day or a separate day (depends on the medical institution's policy) | Because it works through a different route than oral and topical medication, it is sometimes used in combination. However, the drugs and ingredients used in these injections may include ones not approved in Japan, so make your decision after receiving an explanation of what is used, the evidence behind it, and whether it is approved. |
| Low-Level Laser / LED Therapy | Wait required | No particular interval is generally said to be needed | Device-based scalp treatments are sometimes carried out in parallel with drug therapy. The strength of the evidence for effectiveness differs by method, so it is a good idea to ask your doctor what can realistically be expected. |
Who it may suit / who should be cautious
May suit you
- Those starting to notice thinning or increased shedding at the hairline or crown
- Those who want to slow the progression of AGA with medication first, rather than surgery
- Those who want to start treatment without taking any downtime
- Those prepared to continue long term, working out the balance of cost and results with their doctor
- Those who have not noticed change with self-directed over-the-counter care and want a doctor's diagnosis
Consider carefully
- Women (especially those who are pregnant, breastfeeding, or may be pregnant) — the oral medications are considered contraindicated
- Minors (safety is said not to be established)
- Those with severe liver dysfunction
- Those with heart disease or blood pressure conditions whose doctor judges minoxidil unsuitable
- Those with a history of allergy to the medications' ingredients
- Those with medical conditions or medications that lead their doctor to judge the treatment unsuitable
Frequently asked questions
When will I start to see results?
Many people are said to notice less hair loss from around 3 months, with visible changes appearing gradually over 6 months to a year. Effectiveness is generally judged after 6 months to a year, and how results appear varies from person to person. Rather than judging over a short period, it is recommended to continue while consulting your doctor.
I'm scared of initial shedding. Does it always happen?
It does not happen to everyone, but a certain proportion of people are said to experience a temporary increase in shedding around 2 weeks to 1 month after starting. It is usually explained as a transient reaction while the hair cycle resets, and it generally settles within about 1–2 months. If you are worried, consult your doctor rather than stopping on your own.
What happens if I stop the treatment?
Because AGA is progressive, hair is said to gradually return to its previous course over several months to a year after stopping, even if the treatment was working. If you want to maintain your results, this treatment assumes long-term continuation. It is a good idea to decide how to continue together with your doctor, weighing cost and side effects.
I heard the side effects can affect sexual function. Is that true?
The package inserts for finasteride and dutasteride list reduced libido and decreased erectile function among the side effects, reported at frequencies of a few percent or less. Most cases are said to recover after stopping the medication, though there are rare reports of symptoms persisting. If you are concerned, talk to your doctor before starting; and if symptoms appear, contact the prescribing doctor rather than dealing with them on your own.
I was recommended oral minoxidil. Is it safe?
Oral minoxidil is an unapproved medication: it has not been approved in Japan as a pharmaceutical for hair growth (the topical form is approved). With the oral form, excess hair growth, fluid retention, palpitations, and effects on blood pressure have been reported, and when it is prescribed, this is done as elective care under the responsibility of the physician. Make your decision only after receiving a full explanation of the benefits, the risks, and the fact that it is unapproved, and only once you are satisfied.
Can women have the same treatment?
Use of finasteride and dutasteride in women is generally not permitted, and they are considered contraindicated especially for those who are pregnant or may be pregnant. For hair thinning in women, other options such as topical minoxidil (products at concentrations formulated for women) are considered instead. Because hair loss in women has many possible causes, it is recommended to first see a doctor to identify the cause.
How is clinic treatment different from over-the-counter hair-growth products?
Among over-the-counter products, minoxidil-containing hair-regrowth products are approved as pharmaceuticals and can be bought at pharmacies. Oral medications such as finasteride, on the other hand, require a doctor's prescription. What sets clinic treatment apart is that a doctor first confirms the cause and stage through an examination, and can then adjust the combination and dosage of oral and topical medication. Which suits you depends on your condition, so it is a good idea to have an examination and discuss it.
Is it a bad idea to buy the medication from overseas retailers or through personal import?
Personally imported medications carry noted risks of counterfeits and products with unknown ingredient amounts, and if a health problem occurs, it may not be covered by Japan's Relief System for Sufferers from Adverse Drug Reactions. Oral medications in particular require side-effect monitoring, so it is recommended to get a prescription from a medical institution and use the medication alongside regular checkups.
This article is for general informational purposes only and is not an advertisement for any specific medical institution. All figures are typical guidelines; results and recovery vary from person to person. Please see a physician before making any final decision. The information on this site is provided for general informational purposes only and is not a substitute for diagnosis, treatment, or medical advice. Final decisions about a procedure's suitability, risks, combinations, and intervals must always be made after being examined by a physician.