Chinese herb may cut H1N1 fever

In mild cases of H1N1 influenza, a traditional Chinese herb mixture may relieve a fever about as well as Tamiflu, researchers reported.

The herb product, called maxingshigan-yinqiaosan, is not widely available on store shelves in western countries. But in a study of 410 Chinese adults with H1N1 flu, those who took the herb mixture typically saw their fevers resolve after 16 hours, versus 26 hours in patients in a control group whose only flu treatment was acetaminophen if their fever passed 40 degrees Celsius.

Patients in a third group received the prescription antiviral drug Tamiflu, known generically as oseltamivir. With Tamiflu, fevers typically resolved after 20 hours, or six hours sooner than in the control group.

A fourth study group received both the herb mix and Tamiflu, with their fevers generally disappearing in 15 hours, according to findings published in the Annals of Internal Medicine.

Exactly what the results mean for flu sufferers around the world is not clear.

Traditional flu medicines

The study included only young and middle-aged adults who, other than having a fairly mild case of the flu, were healthy. Tamiflu and another antiviral drug, Relenza (zanamivir), are usually reserved for people with severe cases, or those at high risk of flu complications like pneumonia.

It was necessary to first study the effects of maxingshigan-yinqiaosan in low-risk people with milder cases of the flu, said Dr Lixing Lao, a professor at the University of Maryland School of Medicine in Baltimore who was not involved in the research.

But that's also a limitation of the study, he noted.

The Chinese herb effect

"In people with severe illness, this herb may not work. We don't know yet," said Dr Lao, who also directs the traditional Chinese medicine research programme at the university's Centre for Integrative Medicine.

And for healthy people with mild cases of the flu, there's the question of availability.

The herbs used in the study, which were heated and made into a beverage, have a long history of use in China for colds and flu.

They are also widely available in certain other countries, like Japan, Korea and Germany, according to Drs Cheng Wang and Bin Cao of the Beijing Institute of Respiratory Medicine, who led the study.

It's possible, the researchers say, that maxingshigan-yinqiaosan could offer a flu-fighting alternative in certain places where Tamiflu is scarce – like rural China.

But one of the key ingredients is ephedra, or ma huang, which is banned from use in dietary supplements in the US and Canada. Those bans came after ephedra in weight-loss and body-building supplements was linked to heart attacks, strokes and deaths in some users.

That ban did not apply to ephedra's use in Chinese medicine, where small doses are mixed with other traditional herbs – in contrast to the single, higher doses used in the banned supplements.

Chinese herb accessibility

However, most people cannot go to their local store and pull maxingshigan-yinqiaosan off the shelf. They would need to go to a traditional Chinese medicine practitioner, Dr Lao said.

Properly using the right mix of herbs, he said, "requires some knowledge".

Dr Lao said he was happy to see that a Prestigious Medical Journal published a study on a traditional Chinese remedy as it is actually practised – combining small doses of different herbs.

"If you only look at one herb, it may not work," Dr Lao said. He also pointed out that the small herb doses used in practise limit the risk of side effects.

In this study, two of the 103 patients who used maxingshigan-yinqiaosan alone developed nausea and vomiting. There were no side effects reported in the other three study groups.

The US Centres for Disease Control and Prevention (CDC) recommends Tamiflu and Relenza for treating the flu in people who are very sick or at high risk of complications.

But in general, the agency says, flu sufferers who are otherwise healthy do not need the drugs.

According to Dr Lao, the current findings are a "good first step" in showing through a controlled clinical trial that traditional Chinese herbs may also battle flu symptoms.

The CDC stresses, however, that the best defence against the flu is the flu vaccine.

(Reuters Health, Amy Norton, August 2011)

Read  more:

H1N1 short tracked for side effects

Swine flue vaccine available  

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