A Systematic Review of Controlled Trials of Homeopathy in Bronchial Asthma

Homeopathy is a controversial form of complementary therapy, but is widely practised to treat asthma. The aim of this systematic review is to evaluate the controlled trials of homeopathy in bronchial asthma. Relevant trials published between Jan 1, 1981, and Dec 31, 2016, were considered. Substantive research articles, conference proceedings, and master and doctoral theses were eligible. Methodology was assessed by Jadad's scoring, internal validity by the Coch-rane tool, model validity by Mathie's criteria, and quality of individualization by Saha's criteria. Sixteen trials were eligible. The majority were positive, especially those testing complex formulations. Methodological quality was diverse; 8 trials had "high" risk of bias. Model validity and individualization quality were compromised. Due to both qualitative and quantitative inadequacies, proofs supporting individualized homeopathy remained inconclusive. The trials were positive (evidence level A), but inconsistent, and suffered from methodological heterogeneity, "high" to "uncertain" risk of bias, incomplete study reporting, inadequacy of independent replications, and small sample sizes.