Many drugs are so unnecessarily prescribed (for various conditions) these days – big pharma comes up with drugs often with only profits in mind and as we know, they indulge in various unethical practices (such as selective reporting and data mischaracterization) to get these drugs approved – these drugs must be ultimately getting into our ground water and tap water as well. Most of these drugs (although biochemically active) appear to somewhat work only due to the “placebo effect.” For example, meta analyses have shown that most active drugs and placebos have similar effect sizes (especially for health conditions that have continuous outcomes) – see the following reviews: Howick J, et al. (2013) Are Treatments More Effective than Placebos? A Systematic Review and Meta-Analysis. PLoS ONE 8(5): e62599. Kirsch, I. (2014). Antidepressants and the Placebo Effect. Zeitschrift Fur Psychologie. 222, 128-134.