Start at wikipedia and search database normalization.
Look at
Tony Marston's Home Page for one way to do it.
This is a huge subject and hard to get your head around until it apparently "clicks".
Not convinced I get it yet.
Even with the info you've given, we could not answer you.
Ask yourself lots of questions like
"Does one client have more than one medication?"
"Does one client use one medication more than once per day?"
"Does one client use more than one dose medication at any one time?"
"Is one medication used by more than one client?"
What other info do you need to keep?
I do wonder if this isn't someone's "homework"
HTH
Max