- Any ongoing medication which, in the opinion of the investigator, would render the patient unsuitable for the study. Examples of medications that preclude participation in the study are: 1) any psychotropic drug, with the exception of the occasional use of hypnotics, 2) any hormonal preparation, with the exception of thyroid hormone, 3) anti-coagulants, and 4) 5HT1D agonists. Occasional use of analgesic compounds does not preclude participation.