I suffer from seasonal allergies that last anywhere from 2-4 months out of the year. During the height of allergy season, I take Claritin-D – a mixture of loratadine and pseudoephedrine.
Claritin-D 24-hour caplets come in boxes of 10. You need 3 boxes to get a full month's supply. Each caplet has 240mg of pseudoephedrine – 2.4g per box.
In my state, individuals can purchase up to 9g of pseduoephedrine per month, but only up to 3.6g per day.
So, while I can technically purchase a full month's supply of Claritin-D, I can't buy more than one box at a time.
These sorts of rules are minor inconveniences for an individual compared to the rest of life's challenges, but they exist in a special category of stupid that make them all the more frustrating.
But, here's a thought: what if I had children who needed the same medication? Who's going without?
Tangent; you reminded me about the Robitussin liquid (Dextromethorphan) in my pantry. It prescribes 20 mL doses but the bottle contains 118 mL total. Really grinds my gears this is legal.