At my first M and M as a medical student, I heard the story of a patient who had received antibiotics for an upper respiratory tract infection.

CNN: More is not always better in medicine

He said estimates suggested that each year passive smoking in children accounted for more than 20, 000 cases of lower respiratory tract infection, 200 cases of bacterial meningitis, and 40 sudden infant deaths.

BBC: Smoking in the car 'breaks toxic limit'

In CIC clinical trials, the most common side effect were diarrhea (16% vs 5% placebo), abdominal pain (7% vs 6%), flatulence (6% vs 5%), upper respiratory tract infection (5% vs 4%), sinusitis (3% vs 2%) and abdominal distension (3% vs 2%).

FORBES: FDA Approves New Drug For Irritable Bowel Disorder (Update)