To answer the original question...
It really depends on what meds you have access too close to you.. some people will have a bunch of LFS/LPS/Big Box Stores relatively close to them and can go pick up meds within a matter of minutes... some have to travel hours to do the same.
If you are worried, it's always better to have a med available than it isn't... if you're in the habit of buying new fish frequently, that will also add to the problem.
So check what you may need, and don't have available to you closely.