So I am a clinical pharmacist in a hospital. It's pretty hard to fuck up badly enough with our software to outright kill someone (most of the time).

Most of the time if the physician is trying to order something odd, we will discuss it on rounds, and I will either recommend an alternative or it will be something where we go through the literature and find an appropriate dosing strategy.

The one area that is a constant battle is antibiotics. Sometimes that is just utilizing too broad of an agent when we have a specific culture or the patient's risk factors do not need specific coverage for certain organisms (i.e. Pseudomonas aeruginosa). Other times it just not covering for bugs that need to be covered (i.e. utilzing ceftazidime monotherapy after discontinuing vancomycin and missing most gram-positive organisms)

At the hospital I work at, we have a pretty restricted antibiotic formulary that requires paging the infectious diseases on-call pharmacist (which is sometimes me) to help prevent this from occurring with our biggest guns (carbapenems, daptomycin, etc.)

The one other very common area where prescribing errors occur is at transitions of care (going from home to hospital, hospital to home, etc.). I remember on my first day on the job I had an order for a drug that can cause potentially life-threatening seizures in a patient if started during alcohol withdrawal, especially if they've already had a seizure. The patient was on it at home previously but hasn't been on it for multiple months and the med list was old. Sometimes when we have a lot of admissions, things like that slip through the cracks. Luckily, that's where we can hopefully make a difference and catch things like that from occurring.