The Center for Pediatric Hypotension 
Information about the investigation, evaluation, and treatment of adolescents and children with syncope, orthostatic tachycardia, and other forms of chronic orthostatic intolerance including CFS.
http://www.syncope.org/CWRU School of Medicine
This article discusses orthostatic hypotension with a brief description and details on diagnosing, tips to assist the patient, diet, salt, and medications.
http://casemed.case.edu/dept/autonomic/anstopic/oh.htm
PPP Healthcare International
Gives general information about hypotension, discussing causes and what other medical conditions may be associated with this.
http://www.axappphealthcare.co.uk/maia?h=fam_head&f=factsheet_footer&p=consumer/faq_callback&u=fam_utility&n=consumer/health_atoz&t=hypotension_top&b=shared/fact_sheets/hypotension/hypotension
NINDS Orthostatic Hypotension Information Page
Information sheet on orthostatic hypotension including the treatment and prognosis.
http://www.ninds.nih.gov/disorders/orthostatic_hypotension/orthostatic_hypotension.htm
Dr.T C Hain
A look at what causes orthostatic hypotension as well as diagnosing, tests, treatment by way of non-drugs as well as drugs.
http://www.dizziness-and-balance.com/disorders/medical/orthostatic.html
The Merck Manual
A look at the cardiac causes, symptoms, signs, diagnoses, prognosis and treatment of orthostatic hypotension and syncope.
http://www.merck.com/mmpe/sec07/ch069/ch069d.html
Blood Pressure, Low: Hypotension
Medline Health information looks at this disorder. An overview and in-depth look at the causes and treatments.
http://www.nlm.nih.gov/medlineplus/lowbloodpressure.html
