Blocking agent and Medicinal drug

Blocking agent noun - A class of drugs that inhibit (block) some biological process.

Medicinal drug and blocking agent are semantically related. In some cases you can use "Medicinal drug" instead a noun phrase "Blocking agent".

Medicinal drug noun - (medicine) something that treats or prevents or alleviates the symptoms of disease.

Blocking agent and medicinal drug are semantically related. Sometimes you can replace phrase "Blocking agent" with "Medicinal drug", this phrases are similar.