Is there a limit on how much pseudoephedrine or phenylpropanolamine a pharmacist can dispense?

The premise that there are no specific limits on the quantity of pseudoephedrine or phenylpropanolamine that a pharmacist can dispense aligns with the fact that the dispensing of these medications is primarily governed by the instructions provided by the prescriber. Generally, as long as the quantity dispensed is justifiable by the prescription and adheres to the patient's medical needs, it can be provided accordingly. This emphasizes the role of the prescriber in determining the appropriate patient care and medication management, rather than imposing arbitrary quantity limits at the pharmacy level.

In the context of the other options, the first choice incorrectly suggests there are specific legal mandates on quantity, which is not true for all prescriptions. The focus on insurance coverage incorrectly implies that payment or coverage would limit the amount dispensed, which is not a regulatory issue but rather an insurance and financial consideration. The mention of DEA limitations would apply to controlled substances, and while pseudoephedrine is regulated, it does not fall under the categories of controlled substances like CIII drugs, thus not subjecting it to the same quantitative constraints.