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Dexamethasone is a potent corticosteroid that works by reducing inflammation and capillary permeability, which may help limit the mild brain swelling thought to contribute to symptoms of acute mountain sickness, such as headache, nausea, dizziness, and fatigue that occur with rapid ascent to high altitude. Although dexamethasone is FDA-approved for a variety of inflammatory and immune-related conditions, its use for prevention or treatment of AMS is considered off-label, though it is well established in wilderness and travel medicine guidelines.
When used for prevention, dexamethasone is typically started before or on the day of ascent and continued for a defined short course during the period of highest risk, while for treatment of AMS symptoms it may be used for a brief period to help relieve symptoms, particularly in more moderate to severe cases or when descent is delayed. Because dexamethasone only suppresses symptoms rather than addressing the underlying acclimatization process, individuals are cautioned that symptoms of AMS, or more serious high-altitude illness such as high-altitude cerebral edema, can worsen or become masked, so descent remains an important part of managing worsening symptoms regardless of medication use.
Common side effects of dexamethasone include increased appetite, difficulty sleeping, mood changes such as irritability or anxiety, stomach upset, and elevated blood sugar, particularly with continued use. Because dexamethasone can mask the symptoms of worsening altitude illness, there is a risk that serious conditions such as high-altitude cerebral edema or high-altitude pulmonary edema could progress without the usual warning signs, so continued vigilance for symptoms like severe headache, confusion, difficulty walking, or shortness of breath at rest is important, and descent should not be delayed if these occur. Dexamethasone should be used cautiously in people with certain conditions such as diabetes, active infections, or peptic ulcer disease, and anyone experiencing signs of worsening altitude illness despite medication use should descend and seek medical attention promptly.
This information should not be used to decide whether or not to take this medicine or any other medicine. Only a healthcare provider has the knowledge and training to decide which medicines are right for you. TelyRx does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a limited summary of general information about the medicine’s uses from the patient education materials and is not intended to be comprehensive. This limited summary does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not intended to provide medical advice, diagnosis or treatment and does not replace information you may receive from your healthcare provider. For a more detailed summary of information about the risks and benefits of using this medicine, please review the entire patient education information you receive with the medication.
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