Gradually taper dose before discontinuation; abrupt discontinuation may cause dysphoric mood, dizziness, sensory disturbances, agitation, confusion, anxiety, headache, insomnia, tinnitus, seizures, irritability.
A 'metallic' smell is just body odour. The pong from handling iron or copper comes from your own skin. The smell of iron or copper comes from reactions with sweat and skin.Getty.
It seems like it is a mix of flavor and smell that causes the metallic taste. Ferrous II iron causes the strongest metallic flavor according to the study; the amount of iron in your blood is far above the your thresholds for taste and smell. http://www.ncbi.nlm.nih.gov/pubmed/22304665.