Also known as Lamivudine, 
3TC is composed of the (-) enantiomer of the racemic mixture 2'-deoxy-3'-thiacytidine. Like other nucleoside analogs, 
3TC inhibits HIV replication through viral 
DNA chain termination. It has been used in 
clinical trials in combination with 
AZT. See also 
AZT; 
Nucleoside Analog.