I think you're reading something into it that isn't there. It's just not on the shelf, I'm not likely to notice it and incidentally purchase it when I'm buying

I think you're reading something into it that isn't there. It's just not on the shelf, I'm not likely to notice it and incidentally purchase it when I'm buying ibuprofen or whatever, and I have to go out of my way to get it. I can't just have Amazon overnight some to me. As a result I've just gotten in the habit of buying it periodically without waiting for "I'm sick" to be the reason for the purchase. The 6 month period isn't "trying to not get noticed", it's "that period comfortably covers my household's needs with some breathing room". Sure, I could buy 6 boxes at a time. I just don't. There's not really any good reason to min-max my pseuodephedrine acquisition.