Which of the following drugs can no one order?

The classification of drugs into schedules is an essential aspect of federal pharmacy law, particularly under the Controlled Substances Act (CSA). Schedule I drugs are defined as substances that have a high potential for abuse, have no accepted medical use in the United States, and lack accepted safety for use under medical supervision. Because of these factors, these substances cannot be legally prescribed, dispensed, or ordered by any healthcare professional or institution.

This means that no one is permitted to order Schedule I drugs. Examples of Schedule I substances include heroin, lysergic acid diethylamide (LSD), and 3,4-methylenedioxymethamphetamine (MDMA). The prohibition on handling these substances reflects their status as highly dangerous and non-therapeutic within the parameters of current medical practices and regulations.

In contrast, Schedule II drugs have medical uses but are highly regulated due to their potential for abuse, and they can be ordered with a valid prescription. Schedule III and IV drugs also possess recognized medical applications and can be prescribed, although they face varying degrees of regulation. Therefore, the unique classification of Schedule I drugs as those that cannot be ordered or prescribed under any circumstances is why the correct answer is D.