Reply: (by Keith) That's a great question. Pseudoephedrine is more aggressively controlled by some individual state laws than DEA laws. On the Federal level, the drug is not in any DEA drug schedule because it not an addictive substance. However, Ferderal Laws enacted by the 'Combat Methamphetamine Epidemic Act of 2005' restricts an individual to the retail sale of such products to no more than three packages or no more than nine grams in a single transaction. Additionally, there are some requirements to log who is buying the products.
For example, I live in Portland, OR. Out state laws make it impossible to buy any pseudoephedrine products without a prescription. It's treated like Sch.IV drugs. But, I can drive 10 miles to Vancouver, Washington and buy some Sudafed or NyQuill which have pseudoephedrine. When I do, I must present I.D. and fill out a quick form. A database shared by Walgreens knows how much they have sold me until I reach whatever the limit is. I'm not sure what it is because I haven't used all of what I bought last year. But, what they told me was that every 30 days I could get so much (I think it's 9 Grams?).
So, for the purpose of the PTCB or ExCPT exams, just know what the federal requirements.