So why buy 1 every 6 months? Just go buy 6. This sounded like you were trying to avoid the limits:

> Indeed. I've known that phenylepherine is worthless for a long while, and just make it a point to buy a pack of the real stuff every 6 months or so, so that I always have it on hand when I need it. In my state, it's controlled - you have to get it from a pharmacist (though you can do so without a prescription) - they take your driver's license and don't allow you to purchase it too often.