PF-184563 is a potent, selective non-peptidic antagonist of the V1a receptor.

The first reports of highly selective antagonists against the HIV protease were revealed in 1987.

Terutroban is a selective antagonist of the thromboxane receptor.

BRL-44408 is a drug used in scientific research which acts as a selective antagonist for the α adrenoreceptor.

SB-242,084 is a psychoactive drug and research chemical which acts as a selective antagonist for the 5HT receptor.

However for scientific research selective antagonists are needed which can block one of the opioid receptors but without affecting the other two.

L-765,314 is a drug which acts as a potent and selective antagonist for the Alpha-1 adrenergic receptor subtype α.

Istradefylline (KW-6002) is a selective antagonist at the A receptor.

MEN-10376 - potent and selective antagonist, 7-amino acid polypeptide chain.

For example, ajmalicine is a selective antagonist of α-adrenergic receptors and therefore has antihypertensive action.