漢方: The Licensed Option You Were Never Offered

Here is a thing that is true in Japan and almost nowhere else, and that a great many Japanese women have never been told in the form that would be useful to them: around a hundred and fifty kampo formulations are approved medicines covered by national health insurance, kampo is taught in medical schools here, and an ordinary doctor at an ordinary clinic can write you a prescription for one at the same rates as anything else.

Which matters because of where most women actually meet it. It turns up in shops, in expensive wellness packaging, alongside things with no licence and no evidence at all — and the association does it a disservice in both directions. A woman who dismisses the shop version has frequently dismissed the prescription version without knowing there was one, and a woman who buys the shop version is often paying several times over for something she could have been given by a doctor who would also have checked it against everything else she takes.

This page is what it is, what it is genuinely used for in the conditions this library writes about, where the evidence actually stands, and the two safety facts that get left out because people assume that anything made of plants cannot hurt them.

The name means the Han method, and the material did come from China — but what Japan did with it over several centuries produced something a Chinese practitioner would find recognisable and would not call the same thing.

The Japanese development went in a particular direction: toward fewer, more standardised formulas prescribed on a reading of the patient in front of you, and away from the elaborate theoretical apparatus. The dominant modern form is the エキス剤 — a granulated extract in a foil sachet, manufactured to a pharmaceutical standard, with a number on it. That is a long way from a practitioner weighing raw herbs, and it is precisely what made it possible to approve, insure and prescribe.

Which is the fact that changes what you can do about it. In most countries the traditional-medicine question is a question about the unregulated market. Here it is substantially a question about which clinic to walk into, because the regulator treats these as drugs — with approvals, manufacturing standards, package inserts, reported adverse effects and contraindications. That is a much better position for a patient to be in than the one this library keeps describing everywhere else, and it is the reason this page reads differently from the ones about fascia and lymph.

For the complaints this library writes about most — cycles, cold, the transition, the tiredness that has no single cause — there is a small set of formulas that come up constantly, and knowing the names is useful for the same reason knowing any vocabulary is: it lets you ask.

当帰芍薬散 is the one most associated with 冷え性, oedema, irregular or painful periods, and a general picture of being depleted and cold rather than inflamed. 加味逍遙散 is associated with irritability, fluctuating mood, shoulder tension and sleep disturbance, and comes up very often around 更年期. 桂枝茯苓丸 is associated with a different pattern again — congestion rather than depletion, heat rather than cold. Those three are so standard in gynaecological practice here that they are sometimes taught as a group.

The important caution about that paragraph is that it is not a menu. Which one is right depends on the reading described in the next section, and choosing for yourself from a list of symptoms is exactly the mistake the system is built to avoid. The names are here so you can recognise what you were handed and ask why that one — not so you can order it.

This is the part that is genuinely different from the pharmacology you are used to, and it is worth understanding rather than treating as mysticism.

A kampo prescription is made against 証 — a pattern read from the whole person: build, colouring, temperature, energy, how the abdomen feels to a hand, what the tongue looks like, whether things are better or worse in the cold. The disease name matters less than that reading. So two women who would both be coded with the same complaint in a hospital record can correctly receive different formulas, and the same woman may be given something different two years later because the pattern has changed.

Two consequences follow and they point in opposite directions, which is why honest writing about this is rare. The first is that it makes the system unusually attentive to the individual: a practitioner is obliged to look at you rather than at your diagnosis, which is a markedly better experience than a seven-minute appointment about a symptom and is part of why patients report liking it.

The second is that it makes trials awkward in a way that is structural rather than evasive. A randomised trial of one formula for one disease gives every participant the same intervention, which is precisely what the system says you should not do — so a negative result may mean the formula does not work, or may mean it was given to the two-thirds of participants it was never indicated for. That is a genuine methodological problem and it is also, inconveniently, the exact shape of an unfalsifiable excuse. Both things are true at once, and anybody who tells you only one of them is selling something.

Unevenly, and the honest summary is neither of the two summaries usually offered.

Some formulas have been studied properly and have results — the work on 大建中湯 in post-operative bowel function is the example usually cited, and there is a reasonable body of trial work on several others. Much of the rest rests on long traditional use and clinical experience rather than on trials, which is a weaker foundation and is not nothing: several centuries of physicians noticing what happened is a form of evidence, just not one that can distinguish a real effect from a consistent expectation.

For the women’s conditions specifically — the three formulas above — the picture is thinner than the frequency of prescription implies. There is trial work, it is often small, and systematic reviewers regularly conclude that better studies are needed, which is the standard finding in this territory and should be read as neither endorsement nor dismissal.

Which produces an unusually reasonable practical position, and this library does not often get to offer one. The downside risk is low because these are regulated medicines with known adverse effects, the cost is low because they are insured, the prescriber is a doctor who will also be looking for the things this library keeps telling you to rule out, and a trial of six to eight weeks will tell you something about your own case that no review can. That is a much better bet than most of what is sold to a tired woman, and it is a bet rather than a treatment.

Women who have tried this often report something that sounds like it belongs in a different paragraph from the pharmacology, and it is worth taking seriously rather than filing under atmosphere.

The 証 reading requires a doctor to ask about things nobody has asked her about in years — her hands, her sleep, her appetite, whether she is worse in the cold, what her abdomen feels like under a hand. For a woman who has spent a decade in appointments that lasted seven minutes and concerned one symptom, being asked twelve questions about her whole state is not a small experience. Several describe it as the first time a doctor seemed interested in her rather than in her complaint.

Two honest readings of that, and this library will not choose between them for you. One is that a system organised around reading the whole person genuinely produces better attention, and attention is not a side effect — this library has argued at length that being attended to does something measurable. The other is that a long, careful, interested consultation produces a strong context effect regardless of what is in the sachet, and that the improvement a patient then reports is partly the consultation rather than the medicine.

Both are probably true in some proportion, and the reason it does not much matter is that they point the same way. A long consultation with a doctor who looks at your whole state, at insurance rates, is a good thing to have had whichever mechanism is doing the work — and the woman who leaves it feeling better has not been fooled, for the reasons this library sets out at length on its page about what "it worked for me" can and cannot establish.

Two facts that belong in front of anybody taking these, and that shops selling herbal products in wellness packaging never mention.

甘草 — licorice root — is an ingredient in a large share of kampo formulas, and the glycyrrhizin in it can produce a state resembling excess aldosterone: potassium falls, blood pressure rises, the ankles and face swell, and in more serious cases muscle weakness develops. It is dose-related, it is well recognised in Japanese practice, and it is the reason taking two different kampo preparations at once without telling the prescriber is a genuinely bad idea — because the licorice adds up across them and nobody is counting unless somebody knows.

The second is this country’s own hard case. In the 1990s, 小柴胡湯 was associated with interstitial pneumonia, including deaths, in patients being treated for chronic hepatitis — which led to a national safety warning and a contraindication alongside interferon. That episode is the reason the phrase natural therefore safe should not survive contact with a Japanese pharmacology textbook. A medicine strong enough to do something is strong enough to do something else.

A third, smaller one that catches people out because it sounds like a virtue. Kampo is slow, so a woman who feels nothing after ten days frequently doubles the dose on her own or adds a second formula she read about, and both of those are the licorice problem arriving by a different door. The dose on the sachet is a dose, the interval is part of the prescription, and more is not a way of being more committed to getting better.

The practical rules that follow are short. Tell whoever prescribes about everything else you take, including things bought without a prescription and including other kampo. Tell them if you are pregnant, trying to be, or breastfeeding. Report swelling, unusual fatigue, muscle weakness, or any new breathlessness or cough rather than waiting to see. And get it from somebody who can be told these things — which is an argument for the clinic over the shop that has nothing to do with whether the shop’s product is any good.

The last barrier is not medical. It is that most women do not know it is askable, and so do not ask.

You can raise it at an ordinary 婦人科 or 内科 appointment. The sentence is unremarkable: 漢方も試してみたいのですが、私に合うものはありますか — I would like to try kampo, is there one that suits me. Some doctors prescribe it routinely, some refer, and some do not use it, and finding out which costs one question. Clinics that emphasise it exist and can be searched for, and a pharmacy with a 漢方 specialism can also tell you which local doctors prescribe.

Two things worth knowing before you go. Expect questions that sound unrelated — about cold hands, about whether you sweat easily, about your appetite and your sleep and what your abdomen feels like — because that is the 証 reading rather than small talk, and answering it carefully is what makes the prescription fit. And expect it to take weeks rather than days; these are not analgesics, and the usual advice is to give a formula six to eight weeks before deciding it has done nothing.

One more thing worth knowing before the first appointment, because it removes a small fear that stops people. You are not committing to a system or opting out of anything. Kampo is frequently prescribed alongside ordinary medication rather than instead of it, a doctor who writes you 当帰芍薬散 is not thereby telling you to stop taking anything else, and choosing to try it is not a statement about what kind of patient you are. It is one more thing on a list of things that might help, obtained from the same building.

And the sentence this library has now written on several pages, because it keeps being the thing that helps most: the appointment where you mention this is also the appointment where the ordinary causes get looked for. Thyroid, iron, sleep-disordered breathing and the hormonal transition all present as tiredness and low mood, all are treatable, and all are routinely missed in women for years. Whatever you think of kampo, a reason to sit in front of a doctor is not a bad thing to have.

So: around a hundred and fifty formulations are insured medicines, taught in medical schools and prescribable by an ordinary doctor, which makes this the cheapest licensed option in this entire library for several of the complaints it writes about. It is prescribed against a reading of you rather than against a diagnosis, which is both its best feature and the reason its trials are hard. The evidence is uneven and thinner for the women’s formulas than their popularity implies. And it is medicine, which means it is strong enough to harm you — the licorice adds up, and this country has its own deaths on the record to prove the general point.

If one thing is worth carrying: the version of this worth having is the one inside the system you already pay into, from somebody you can tell everything to — not the one in the beautiful box, at four times the price, from somebody who will never ask what else you are taking.