Anaesthetic agent and Intravenous anesthetic

Anaesthetic agent noun - A drug that causes temporary loss of bodily sensations.

Intravenous anesthetic and anaesthetic agent are semantically related. In some cases you can replace phrase "Intravenous anesthetic" with "Anaesthetic agent", this phrases are similar.

Intravenous anesthetic noun - An anesthetic that produces anesthesia when injected into the circulatory system.

Anaesthetic agent and intravenous anesthetic are semantically related. You can use "Anaesthetic agent" instead a noun phrase "Intravenous anesthetic".