1) Crixivan 2) Protease inhibitor 1) Crixivan 
A drug that interferes with the ability of a virus to make copies of itself.
<chemical> A potent and specific HIV protease inhibitor that appears to have good oral bioavailability. ... Pharmacological action: anti-HIV agents, HIV protease inhibitors. ... (12 Dec 1998) ... 
(in-din´nә-vir) an HIV protease inhibitor that causes the virus to form noninfectious particles; used orally as the sulfate salt in the treatment of HIV infection and AIDS.
An experimental protease inhibitor drug made by Merck pharmaceuticals
Crixivan noun a protease inhibitor (trade name Crixivan) used for treating HIV