Should I take Diamox as a preventative measure?

Many trekkers take 125mg twice daily, starting 24 hours before ascent. However, it is a prescription medication; you must speak with a travel clinic doctor before leaving home to ensure it is safe for you.

Can I just hike faster if I feel good?

No. Altitude sickness often hits without warning. Even if you feel strong, stick to the daily ascent limits to allow your red blood cell count to adjust to the lower oxygen levels.

Preventing Altitude Sickness in the Himalayas

To prevent altitude sickness, you must follow a strict 'climb high, sleep low' approach and never ascend more than 300 to 500 meters in elevation per day once you pass 3,000 meters. Proper acclimatization requires drinking 3 to 4 liters of water daily and pausing for a rest day every 1,000 meters of vertical gain.

Follow the 'Climb High, Sleep Low' rule. Each day, try to hike to a higher altitude during the day for acclimatization, but always return to a lower altitude to sleep. This forces your body to adapt to the thinner air without over-taxing your system at night.
Control your ascent rate. Above 3,000 meters, limit your sleeping altitude increase to a maximum of 500 meters per night. If you feel symptoms of Mild Acute Mountain Sickness (headache, nausea, lethargy), stop your ascent and stay at your current altitude for an extra night.
Hydrate aggressively. High altitudes are extremely dry. You need to drink at least 3 to 4 liters of water daily. Use electrolyte tablets to maintain salt balance, as simple water consumption alone can sometimes lead to hyponatremia at extreme heights.
Eat high-calorie, low-protein diets. Your body requires more energy to digest at altitude. Prioritize carbohydrates, which are easier to process in low-oxygen environments. Avoid heavy meat dishes, as they require significant oxygen for digestion.
Recognize the red flags. If you develop a wet cough, have trouble breathing at rest, or experience loss of coordination (ataxia), these are signs of HAPE or HACE. Descend immediately—do not wait for the next morning. Your life depends on losing altitude as fast as possible.

Should I take Diamox as a preventative measure?: Many trekkers take 125mg twice daily, starting 24 hours before ascent. However, it is a prescription medication; you must speak with a travel clinic doctor before leaving home to ensure it is safe for you.
Can I just hike faster if I feel good?: No. Altitude sickness often hits without warning. Even if you feel strong, stick to the daily ascent limits to allow your red blood cell count to adjust to the lower oxygen levels.