If you look at primary care in the United Kingdom, you'll find that a vast majority of family practitioners, certainly in urban areas, have e-prescribing and electronic medical records. In some jurisdictions they don't actually give a written prescription. The patient has their pharmacy on record, the button's pressed, and the prescription goes directly there, so it's being filled while they're still leaving the surgery or making their way out.
I think there is data in publications from the U.K. that show very clearly that you can reduce the number of drug interactions, particularly in the elderly, with a mechanism like this. Certainly in hospitals—a lot of my practice is hospital based—we have medication error reduction protocols, and we also have checklists for prescriptions, to try to reduce the chances of writing the wrong drug up.
With medication errors, there are lots of holes in the cheese to line up. So you can get the diagnosis wrong and prescribe the right drug for the wrong diagnosis or vice versa. Then you can get the right drug but the wrong dose. Then you can have interactions with others. In hospitals there are already a lot of fail-safe mechanisms that will reduce that happening, but they're not necessarily electronic.