Toubkal altitude sickness risk
Altitude sickness on Toubkal is rare but real. The Imlil refuge is at 3207m; the summit at 4167m; most climbers sleep at the refuge then attempt the summit day. The sleep altitude + ascent rate + age determine your risk.
The tool
What this solves
Altitude sickness on Toubkal is uncommon but real. The standard advice is 'hydrate, go slowly' which is true but doesn't tell you when to descend. This tool scores the risk, gives the symptoms-to-descend threshold, and the Diamox use case.
How to read the result
Risk score: combines sleep altitude, prior exposure, age. 0-3 low, 4-6 moderate, 7-9 high, 10+ severe.
Mild headache at refuge: Diamox + rest. Reassess morning.
Strong headache + nausea: descend 500m. Do not ascend.
Confusion or ataxia: descend immediately. HACE.
Limitations
These are heuristic scores based on Lake Louise AMS scoring adapted for Toubkal. Real risk depends on hydration, exertion, and individual physiology. Diamox can help but is not a substitute for descent. Always check with your guide.
FAQ
Should I take Diamox preventively?
Many climbers do (125mg twice daily starting 24h before ascent). Evidence is mixed; consult a travel doctor before the trip.
How long do symptoms last?
Mild AMS: 24-48h at altitude. Strong AMS: descends within hours. HACE: emergency, hours.
Can I summit with mild headache?
Yes, with Diamox. With strong headache or nausea, no.
Sources
- Lake Louise AMS scoring system 2018 revision
- Wilderness Medical Society guidelines on altitude illness 2024
- Personal Toubkal ascent logs with AMS incidents 2024-2025