i've been taking sinemet for 3 yrs--current dose 25/100, 7 x day. lately have had a terrible taste (metallic?) in mouth. is that usual, common? i just added amantadine 2 days ago (one 100 mg/day). today I feel positive. i'm hopeful because had difficulty w/eldepryl, mirapex, comtan. thanx in advance. nancy spires