Another thing I would suggest is a thorough checkup before going and a talk with your or her doctor about taking along Diamox or whatever is the most recent drug for treating altitude sickness. I've even read that Viagra works also-it is a vasodialator from what I understand.

http://men.webmd.com/news/20050201/viagra-may-help-severe-altitude-sickness

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0000766/
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