Let’s say a physician writes a prescription for Colchicine and accidentally orders “10.0 mg,” when he should have ordered “1.0 mg.” That’s a tiny decimal error, a mistake even the best doctor could make. But it can be catastrophic for the patient. The higher dose could cause Colchicine poisoning, similar to arsenic poisoning: burning in the mouth and throat, excruciating abdominal pain. Internal organs would melt away and death would likely occur within 24 to 72 hours.
The ease with which even the best doctors can make gruesome errors is why hospitals set up elaborate systems to check and double check orders before drugs are given to patients. Some hospitals are better at this checking than others. Medication errors happen all the time, an estimated one million each year, contributing to 7,000 deaths. On average there is one medication error every day for every inpatient.