Metronidazole
"Was admitted into the hospital for 3 days 2 nights and nobody could figure out what was wrong with me. Ended up finding c diff colitis in my stool and was prescribed 500mg metronidazole (flagyl) as oral tablets. 

Needless to say everyone I hear from tell me it tastes awful. It's best to swallow as fast as possible for the taste is definitely bad. The doctor who prescribed this told me if you drink plenty of water while taking this medication, your side effects may not even exist. 

Well he was right. The one time I didn't have any water for a few hours I got the absolute WORST headache that would not go away. I recommend at least 16oz of water per hour with this medication and the side effects should be either mild or non existent. staytough"