Not to criticise, but I honestly can't see why anyone would need more than 30 panadeine / nurofen plus / panamax co. in the house at a time? Even if you were taking them round the clock, that's enough to last 72 hours straight. If you need codeine for any longer than that, you need to see a doctor for a script.
TBH I think some people just don't want to have to go to the chemist as often, and if there were two of you needing it, it wouldn't last very long. We also, tend to divide up the pack between work bags, home handbags. I am sure it isn't necessary to have more than 30, but these are just my thoughts....