Most people now recognize mercury is toxic. They didn't always. There was mercury in popular antiseptics and OTC products till it was banned.
A heart-wrenching story of a man taking a transplant drug exempted from a ban due to inadequate manufacturing controls. ProPublica reports
Dangerously low sodium levels can kill! Medications for hypertension, heartburn and depression can cause drug-induced hyponatremia. Beware!