Progressive Multifocal Leukoencephalopathy, or PML, is a degenerative condition that attacks the myelin, which is the substance found protecting the nerves in the white matter of the human brain. When the myelin degenerates as a result of drugs proven by the FDA to cause this degeneration, such as Tysabri, which is an immunomodulator, Rituxuan which is a rehumatoid arthritis treatment, Raptiva, which is a severe plaque psoriasis treatment, and Transplant drugs such as CellCept, Myfortic, and others, it becomes absolutely critical to file Progressive Multifocal Leukoencephalopathy litigation in order to recover damages caused by taking these dangerous drugs. PML Symptoms include walking issues, arm weakness, balance difficulty, slurred speech, inaccruate hearing, vision degradation, personality changes, a clumsy demeanor, and a general decline in cognitive and mental ability. The side effects are severe, and costly, so victims must find a PML lawyer to litigate for their maximum justice.