4. Current use of class I anti-arrhythmic medications; SSRI or SNRI antidepressants; pimozide, MAO inhibitors, reserpine, guanethidine, cimetidine or methyldopa, omeprazole; tri-cyclic and tetra-cyclic anti-depressants, neuroleptics or anti-convulsants, triptans, tramadol, linezolid, tryptophan, and St. John's Wort; but not gabapentin