I'm not sure it is that high, but doctors do tend to prescribe more instead of saying "no, you can't have the antibiotic for your cold". Part of this is a regulatory issue as well - I walk into a pharmacy here in Norway and you have to ask for some of the medicines, even though they are available without prescription. In the states it was different - basically no regulation. On top of the fact that medicine in the states is most definitely a consumer good paid for by the individual... in universal coverage, it is a bonus not to over-prescribe medicines and to make sure that those that need medication take care of themselves as they should so that costs don't go up - and people don't need more medication.

Making medicines easier to take doesn't actually address any of this outside of making it slightly easier for those on medication to take it as they should so that their conditions don't get worse.