Metronidazole
"I'm using it for a five day period for a bacteria infection, twice a day. I think its working. It's my fourth day and it was the only day I felt slight irritation. I'm not sure if that means it has stopped working or what but I hope that after my last day that I finally get a full ease.

My only side effect is headache and dizziness as well as nausea which isn't so bad. As for the taste, I don't keep it on my tongue long enough to get a good taste so I can't testify for that."