Even if you're illiterate, you can probably read the numbers on the tablets. Of course, you may not be able to add them, or figure out what 1/2 of 4 mg is, so combining pills to get your dose right may be something of a challenge.
(FWIW - many years ago I had a part time job as marketing manager at a company that sold small items - and part of the job, at the beginning, was pulling items from the shelves, just so I had the experience that their shipping people went through. One challenged worker was amazed that, when you pull ten items from a box of 100, you wind up with 90 items. Some people ARE challenged - but it's good that there are jobs out there for them)