Default autocorrect is only part of the issue. The more important problem is that it doesn't correct medication names to some odd word combination, like fluoxet

Default autocorrect is only part of the issue. The more important problem is that it doesn't correct medication names to some odd word combination, like fluoxetine -> flu oxen time, but to another medication. And you can't just not have those names in there by default. They have to be either blacklisted or installed at once, and that list must be updated regularly indefinitely. Adding a few choice medication names means those words become candidates for a number of other 'misspellings', so you need ALL the possible drug names to prevent correction from another (correct) drug to the newly added (incorrect) one. Of course the dark path behind this is that a drug company can pay keyboard/spell check makers an incentive to autocorrect to their drugs. You typed "Lipitro". Did you mean "Zocor"?