The macroenvironment consists of forces that originate outside of an organization and generally cannot be altered by actions of the organization. In other words, a firm may be influenced by changes within this element of its environment, but cannot itself influence the environment.
What is Tysabri? Tysabri (natalizumab) is a prescription medication for adult patients with relapsing forms of multiple Sclerosis. It is shown in clinical studies to slow the worsening of disability caused by MS and decrease the number of flare-ups, or relapses. Tysabri may also improve mental function in some patients.
Multiple Sclerosis: The efficacy of Tysabri compared to placebo in the treatment of MS was evaluated after receiving 28 weeks of treatment. At the end of 2 years 67% of MS patients who received Tysabri 300 mg every 4 weeks reported no relapse or disabilities compared to 41% of patients on the placebo treatment. Only 17% of patients on Tysabri treatment experienced an increase in their symptoms compared to 29% of patients in the placebo group.