Hydroxyzine (/haÉªËdrÉksÉ¨ziËn/ ; sold as Vistaril, Atarax) is a first-generation antihistamine of the diphenylmethane and piperazine class.It was first synthesized by Union Chimique Belge in 1956 and was marketed by Pfizer in the United States later the same year, and is still in widespread use today.ydroxyzine (/haÉªËdrÉksÉ¨ziËn/ ; sold as Vistaril, Atarax) is a first-generation antihistamine of the diphenylmethane and piperazine class.
Meningitis can also be caused by the direct spread of a nearby severe infection, such as an ear infection (otitis media) or a nasal sinus infection (sinusitis). An infection can also occur any time following direct trauma to the head or after any type of head surgery.
Causes. Meningitis can be caused by the following the infectious agents: 1  Bacteria. 2  Bacterial meningitis is the most severe and serious type of meningitis. 3  It occurs when bacteria migrates to the brain and spinal cord from the bloodstream. Non-infectious meningitis due to allergic reaction or autoimmune disease may be treated with cortisone-like medications. 2  In some cases, no treatment may be required, because the condition can resolve on its own. 3  Cancer related meningitis will also resolve itself when the underlying cancer is treated.