WHO monographs on selected medicinal plants - travolekar.ru

Cortex Berberidis
eally)-induced toxicity, suggestive of an inhibitory effect on microsomal
drug metabolizing enzymes, cytochrome P450 isozymes (63).
Uterine stimulant effects
A hot aqueous extract of the bark (alkaloid free) stimulated contractions in
isolated guinea-pig uteri at a concentration of 1:200 (1 ml extract in 200 ml
bath medium) (64, 65). A 70% ethanol extract of the crude drug inhibited
spontaneous, oxytocin- or serotonin-induced contractions in isolated rat
uteri, with a median inhibitory concentration range of 10.0–19.9 μg/ml (66).
Clinical pharmacology
Berberine has demonstrated efficacy for the treatment of secretory diarrhoea
(14–20). However, the quality of the trials was limited by a lack of
positive controls. Few studies have compared the efficacy of berberine
with that of tetracycline for the treatment of fluid loss caused by diarrhoea
in patients with cholera or in non-cholera diarrhoea (14, 15, 17, 62).
In a randomized, double-blind, placebo-controlled clinical trial involving
400 patients with acute watery diarrhoea, the antisecretory and
vibriostatic effects of berberine and tetracycline were evaluated (14). In
this study of 185 patients with cholera, oral administration of tetracycline
or tetracycline and berberine, at a dose of 100.0 mg orally four times daily,
reduced the stool volume and frequency, as well as the duration of diarrhoea.
In the berberine-treated group, together with a reduction in stool
volume, a 77% reduction in the concentration of cyclic adenosine monophosphate
in the stool was observed. Neither berberine nor tetracycline
exhibited any benefit over placebo in patients with non-cholera diarrhoea
of unspecified etiologies (14).
A randomized comparison-controlled trial involving 165 patients assessed
the antisecretory activity of berberine sulfate for enterotoxigenic
Escherichia coli-induced diarrhoea. Patients received either 400.0 mg of
berberine as a single oral dose or 1200 mg of berberine sulfate (400.0 mg
every 8 hours) for the treatment of cholera (17). In patients with Escherichia
coli-induced diarrhoea who received a single oral dose of berberine,
the mean stool volumes were significantly (p < 0.05) reduced over those
of controls during three consecutive 8-hour periods after treatment. At
24 hours after treatment, more of the patients who were treated with berberine
and had Escherichia coli-induced diarrhoea, had less diarrhoea than
controls (42% versus 20%, p < 0.05). Patients with diarrhoea due to Vibrio
chlolerae who received 400.0 mg of berberine had a reduction in stool
volume, but those treated with 1200 mg of berberine plus tetracycline did
not. No adverse effects were observed in the patients receiving berberine.
The results of this study indicated that berberine was an effective and safe
39