Chance of missed period from missed synthroid medicine. . . . breast tenderness . . . missed dose medication errors. BEEN EXACTLY A YEAR SINCE I BEEN OFF OF IT I MISSED MY PERIOD . . vaginal discharge, missed/irregular periods, acne, or . . . increased synthroid dosage and missed period. Best Time Of Day To Take Synthroid - Free tips . to see a thyroid specialist who prescribed Synthroid medication. . Synthroid; Tramadol; Trazodone; Vicodin . . . . . . . . It showed up once a year. . . . . usi... more