Schedule drugs are substances that are controlled, in other
words, have stricter guidelines for dispensing due to the potential
for abuse. Schedule I are illegal substances such as heroine.
Schedule II are the ones that have a high potential for abuse but
have shown a significant medical benefit for use such as methadone
or oxycontin. Schedule III, IV, and V have potential for abuse but
are generally dispensed under similar guidelines. Essentially, the
lower the drug Schedule, the harsher the penalty if used or
possessed improperly.