Clindamycin
"I was given this for a severe sinus infection, I have taken the full prescription as noted and am still suffering ailments of the sinusitis, each time the med is taken I cough uncontrollably, have the nastiest metallic taste in my mouth along with nausea and an enormous amount of heartburn,feverish feeling almost like I am sunburned I took 2 150mg 4x a day for 10 days. Will try to avoid this one next time."