- The patient did use any of these medications during the 3 months before entering the study: clonidine, guanethidine, blood thinners (e.g. warfarin or Coumadin), antidepressants (e.g. amitriptyline, citalopram, doxepin, fluoxetine, nortriptyline, paroxetine, sertraline), cold or allergy medicine that contains a decongestant, medications to treat high or low blood pressure, seizure medicine (e.g. phenobarbital, phenytoin, primidone), or diet pills.