Copies with slight changes to extend drug life with new brand names- Clarinex for Claritin, Nexium for Prilosec, Paliperidone for Risperdal being the latest in this new marketing strategy of drug companies to extend the life and sales of a successful drug. The drug companies try to market the copy drug as a significant improvement, which is what J&J is doing with Paliperidone. Experts are skeptical. Pricing of the generic versions of Risperdal or its copy will be much less expensive. Cost is a sensitive issue. About 15% of Risperdal's $1.35 billion sales were from Medicaid, generic substitutions offer potentially large savings. Meantime J&J did not do clinical tests between Risperdal and Paliperidone, the tests with 1600 patients compared Risperdal with a sugar pill. A psychiatry Professor at Duke and another professor at NYU are skeptical of J&J claims for Paliperidone. United Health shows savings of $150 million by using generics instead of Nexium, so managed care payors will tread carefully....