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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

causal agent, cause, causal agency go
any entity that produces an effect or is responsible for events or results

agent go
a substance that exerts some force or effect

drug go
a substance that is used as a medicine or narcotic

medicine, medication, medicament, medicinal drug go
(medicine) something that treats or prevents or alleviates the symptoms of disease

antiviral, antiviral agent, antiviral drug go
any drug that destroys viruses

protease inhibitor, PI
an antiviral drug used against HIV

noun.artifact

4 Subcategories

indinavir, Crixivan go
a protease inhibitor (trade name Crixivan) used for treating HIV
nelfinavir, Viracept go
a protease inhibitor (trade name Viracept) used in treating HIV usually in combination with other drugs
ritonavir, Norvir go
a protease inhibitor (trade name Norvir) used in treating HIV
saquinavir, Invirase go
a weak protease inhibitor (trade name Invirase) used in treating HIV