a) have a pill for every disease
b) give placebos if we don't have anything better
c) A/B-test viable new alternative drugs (or maybe multi armed bandit's minimum regret is appropriate here ;)
That way patients might get the benefits of placebo without resorting to alternative medicine and you would be able to test effectiveness of drugs much more accurately.
You could even offer people different tracks, such as 'conservative', 'regular', 'progressive' and 'experimental' where different (new) drugs with different risk profiles can be issued.
If you'd make regularly contributing data (completing questionnaires) on your progress / health status a requirement for participation we could even start doing big-data analysis on this (massively valuable) data set quite soon.