In addition to the medical advise offered here you or your friend should make arrangements well in advance if treatment is needed while away including health insurance arrangements that vary from company to company.

My father was on dialysis for four years and when travelling out of the area had to make arrangements well in advance as possible with the clinic or hospital. At that time insurance covered a specific number of treatments when out of network. Check the policy and contact the insurance company for pre-authorization, if needed. Usually his doctor will do this for him.