Metronidazole and Tinidazole

For metronidazole and tinidazole: Infections caused by certain protozoa such as Trichomonas vaginalis, Entamoeba histolytica, and Giardia lamblia, and for bacterial vaginosis

For metronidazole: Pelvic and abdominal bacterial infections, rosacea, meningitis

Nausea, vomiting*

Headache*

Flushing*, rash

Numbness and tingling in the hands and feet (peripheral neuropathy)

For metronidazole: Metallic taste, dark urine