During the 1980s the share of prescriptions sold by retail pharmacies
that was accounted for by generic products roughly doubled. The price
response to generic entry of brand-name products has been a source of
controversy. lit this paper we estimate models of price responses to g
eneric entry in the market for brand-name and generic drugs. We study
a sample of 32 drugs that lost patent protection during the early to m
id-1980s. Our results provide evidence that brand-name prices increase
after generic entry and are accompanied by large decreases in the pri
ce of generic drugs.