A placebo is a treatment with no intended therapeutic value. Monastic hospitals developed many treatments, both therapeutic and spiritual. Deep brain stimulation is a neurological surgical procedure used for therapeutic purposes. Further studies are underway on this therapeutic modality. Expressive psychotherapists use the different disciplines of the creative arts as therapeutic interventions. Daig Corporation manufactured cardiac catheters for diagnostic and therapeutic uses. Lichens produce metabolites in research for their potential therapeutic or diagnostic value. Iontophoresis has experimental, therapeutic and diagnostic applications. MicroRNAs have the potential to be used in diagnostic and therapeutic decisions. Its use can be divided into diagnostic and therapeutic applications. Dart poisons are under active investigation for their potential as therapeutic drugs. It can be used as a form of therapeutic intervention. This may lead to lower therapeutic doses. A further subdivision is the diagnostic versus therapeutic specialties. Citalopram is considered safe and well tolerated in the therapeutic dose range.