Pathologies

Altitude sickness.
Altitude sickness occurs when you cannot get enough oxygen from the air at high altitudes.

Treating altitude sickness

If you have symptoms of mild altitude sickness, you shouldn't go any higher for at least 24 to 48 hours.

Most cases will improve during this time, but it may help if you:

• don't exercise
• drink plenty of fluid (but not alcohol)
• don't smoke
• rest until you feel better

Medication

Nifedipine

This medication decreases the narrowing of the artery that supplies blood to the lungs, helping to reduce chest tightness and ease breathing. It's usually taken as a tablet at six- to eight-hour intervals. 

Nifedipine can cause a sudden drop in blood pressure, so it's important not to get up too quickly from a lying or sitting position if you take it.

Nifedipine may cause side effects such as:

• ·         headache
• ·         sickness
• ·         Dizziness or lightheadedness
• ·         Blush
• ·         Heartburn
• ·         Fast heartbeat
• ·         muscle cramps