Clarithromycin
"I'm in day 3 of taking this antibiotic having being diagnosed with a severe chest infection. Within 48 hours the stabbing pain and aches in my chest has completley disappeared. I have a awful bitter taste like  an aerosol spray/some sort of gas in my mouth. Cleaning my teeth and drinking helps this but it always feels worst at night :( Last night I had a bad nightmare but after that slept well. I've had lots of tummy gurgling and today feel really nausea :( Have also been going to the loo more then usual! I'm pretty anxious about taking the next 4 days but unsure if there is anything else I can take? I'm allergic to penicillin."