What should you know about prescription drug for altitude sickness?

Altitude sickness can occur when the body has not adjusted to thinner air, often after travelling quickly to a high elevation. A prescription may help prevent symptoms or support acclimatisation, but it does not make rapid ascent safe and does not replace rest at the same height or moving lower when symptoms worsen. Early symptoms can include [Headache](/symptoms/headache/) and [Nausea](/symptoms/nausea/), along with tiredness, poor sleep, dizziness, or reduced appetite.

Discuss the itinerary, sleeping elevations, ascent schedule, and your medical history during a [Travel Health Consultation](/treatments/occupational-and-travel-medicine/travel-health-consultation/). Follow the prescribed timing and ask whether it is for prevention or rescue. Ascend gradually, allow time to acclimatise, drink normally, avoid heavy exertion at first, and do not use the medicine to push through worsening symptoms. Carry the prescription in its original packaging and know how to obtain help along the route.

Stop ascending and seek urgent help for confusion, difficulty walking, severe breathlessness at rest, blue lips, fainting, or a cough producing frothy sputum. Move to a lower altitude promptly if symptoms are progressing; do not wait for the next dose to take effect. A headache or nausea that does not improve with rest also warrants medical advice.

Ask how the medicine interacts with your regular treatment, what side effects to expect, when to start and stop it, and what symptoms mean you must descend. Confirm your emergency plan for remote locations and whether another condition could mimic altitude sickness.