With Claritin 's decline , Schering-Plough 's best-selling products are now antiviral drug ribavirin and an interferon medicine called Peg-Intron -- two drugs used together to treat hepatitis C.
With Claritin 's decline , Schering-Plough 's best-selling products now are two drugs used together to treat hepatitis C , the antiviral pill ribavirin and an interferon medicine called Peg-Intron .
Medical experts said Blair 's problem was worrying but relatively common and easily manageable .