Final answer:
MEDMARX identifies the leading cause of medication errors as overdoses of prescription or over-the-counter medicines. Medication overdosing is a significant concern that underscores the importance of correct dosing. Illegal drug overdoses are recognized risks, but they fall outside clinical medication management errors.
Step-by-step explanation:
The leading cause of medication errors, as identified by MEDMARX, involves prescription or over-the-counter medicines taken in doses that are too high, which is known as medication overdosing. In the medical community, there is also awareness regarding the risks associated with overdoses of illegal drugs, though these cases differ significantly from errors in medication management within a clinical context. It is crucial for medical professionals to follow accurate prescribing and dosing guidelines to prevent such errors, which can have serious or even fatal consequences.