>In fact, are there any approved drugs which target RNA other than antibiotics?< Vitravene: <A HREF="http://www.fda.gov/cder/consumerinfo/druginfo/vitravene.HTM" target="_blank">http://www.fda.gov/cder/consumerinfo/druginfo/vitravene.HTM</A> But I don't think anyone is investing in RNA targeting technologies because of vitravene. It's been a commercial flop.