What are reasons why Pfizer spend energies on ‘Centrum’ marketing?

Recently, Pfizer Pharmaceuticals Korea has given its best on promoting the top 2^nd product in the Korean vitamins market, ‘Centrum.’ It means the company will target OTC drugs and quasi-drugs that are familiar to customers over pharmaceutical companies specializing in ETC drugs. It was also told it tries to broaden the gap against Daewoong Pharmaceutical’s Impactamin which rapidly chase after i...