The following reactions have also been reported during treatment with Metrogyl (Metronidazole): Mouth: A sharp unpleasant metallic taste is not unusual.
Oral suspension: Furry tongue, glossing and stomatitis have occurred; these may be associated with a sudden overgrowth of Candida which may occur during effective therapy.
Hematopoietic: Reversible neutropenia (leukopenia), rarely, reversible thrombocytopenia.
Cardiovascular: Flattening of the T-wave may be seen in electrocardiographic tracings.
Central Nervous System: Convulsive seizures, peripheral neuropathy, dizziness, vertigo, in-coordination, ataxia, confusion, irritability, depression, weakness, and insomnia.
Hypersensitivity: Urticaria, erythematous rash, flushing, nasal congestion, dryness of the mouth (or vagina or vulva) and fever.
Renal: Dysuria, cystitis, polyuria, incontinence, and a sense of pelvic pressure.
Oral suspension: Instances of darkened urine have been reported and seen to have no clinical significance.