ethical drug vs medication

ethical drug and medication both are nouns.

Word	Noun	Adjective	Verb	Adverb
ethical drug	Yes	No	No	No
medication	Yes	No	No	No

As nouns, medication is a hypernym of ethical drug; that is, medication is a word with a broader meaning than ethical drug:

ethical drug: a drug that is available only with written instructions from a doctor or dentist to a pharmacist
medication: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of ethical drug include medicament, medicinal drug, medicine.

ethical drug (noun)	medication (noun)
a drug that is available only with written instructions from a doctor or dentist to a pharmacist	the act of treating with medicines or remedies
	(medicine) something that treats or prevents or alleviates the symptoms of disease