Metronidazole
"I am on 5 days 400mg x 3 times/day course for infection in my stomach.

I am on second day on this medicine. Feeling alright so far except Dry mouth and little metallic taste which goes away after sipping water every 30 mins. 

Drink lot of water but break it into small quantity, that way you get rid of dry mouth and other symptoms. 

Try to eat as well otherwise you feel  more sick."