bacterial infection
"Before taking flagyl,  make sure to review all possible negative interactions it might have with other medications you're taking. My recent battle with flagyl occurred after I was diagnosed with diverticulitis. It just happened to coincide with my decision to start taking Tagamet for my acid reflux. Little did I know that Tagamet, a fine drug by itself, should not be taken along with flagyl. Soon after my regimen of flagyl and cipro started, I began experiencing a horrible metallic taste that permeated my entire system. My skin became hot and sensitive. I was nauseous. Bad headaches. Dizziness. Stiff neck. Insomnia. Tagamet, a pharmacist told me, was preventing the release of flagyl from my system, compounding its negative effects."