pneumonia
"This medicine made me feel absolutely horrible.  Funny chest feeling, foggy head, dizzy, and an overall bad feeling.  Never want to take again.  Last three days took 1/2 in a.m. and other 1/2 in p.m.  That was a lot better.  Have been off for about two weeks, and still a foggy and light headed.  Do not want to take again ever.  I am 71 years old and it is not recommended for older people."