We tested, under independent conditions, the reproducibility of eviden
ce from two previous trials that homoeopathy differs from placebo. The
test model was again homoeopathic immunotherapy. 28 patients with all
ergic asthma, most of them sensitive to house-dust mite, were randomly
allocated to receive either oral homoeopathic imm;notherapy to their
principal allergen or identical placebo. The test treatments were give
n as a complement to their unaltered conventional care. A daily visual
analogue scale of overall symptom intensity was the outcome measure.
A difference in visual analogue score in favour of homoeopathic immuno
therapy appeared within one week of starting treatment and persisted f
or up to 8 weeks (p=0.003). There were similar trends in respiratory f
unction and bronchial reactivity tests. A meta-analysis of all three t
rials strengthened the evidence that homoeopathy does more than placeb
o (p=0.0004). Is the reproducibility of evidence in favour of homoeopa
thy proof of its activity or proof of the clinical trial's capacity to
produce false-positive results?