influenza
"Went to the doctor yesterday afternoon and was diagnosed with the flu (after 24 hours of symptoms).  I woke up today tired, with an 80% improvement in body aches and almost no fever.  Congestion is still an issue but not the epic disaster I experienced with the flu years ago.  The only side-effect I experienced was increased frequency of bowel movements.  In all, I would say this medication is pretty good.  Feels like the manufacturer got this one right!"