Clarithromycin
"Have only been on this medicine for two days and I am debating over whether or not I should continue taking the rest.  Thankfully no hallucinations or nightmares.  However, the aftertaste is horrible.  You can't get rid of it.  Everything you eat and drink tastes awful.  Gum and mints help with the taste.  Unfortunately, there is nothing you can do when it is time to go to bed.  Not sure if the tummy cramps are from the illness or from this medicine."