The incidence of over-the-counter medication use in patients with midgut neuroendocrine tumors.

Recent increases in the use of over-the-counter (OTC) medicines and the underreporting of the use of these medications to physicians have sparked interest in the number and types of "supportive" therapies used by patients with neuroendocrine tumors (NETS). Patients with NETS are of special interest as a result of the potential interactions/interferences between tumor-associated peptide and amine production and OTC supplements. A prospective analysis of patients with primary small bowel NETS between 1998 and 2012 was conducted to define and catalog each patient's prescription and OTC medication use at each clinic visit.