Pain or abdominal spasms, metallic taste, xerostomia, constipation, diarrhea, loss of appetite, nausea, vomiting; headache, ataxia, vertigo, psycho-emotional disorders, peripheral neuropathy (on long-term use), cramps; leucopenia; dark-brown coloration of urine; urticaria, prurigo of teguments, eruption; itching, burning, pain & irritation of vag mucosa, especially at treatment initiation.