Final answer:
The dose of dexamethasone to reduce the risk of recurrent headache in the next 24-72 hours varies depending on individual factors and should be determined by a healthcare professional.
Step-by-step explanation:
The dose of dexamethasone to reduce the risk of recurrent headache in the next 24-72 hours depends on several factors, including the underlying cause of the headache and the patient's individual characteristics. In general, dexamethasone can be prescribed at a dose of 4-24 mg per day, divided into multiple doses. The exact dosage would be determined by a healthcare professional based on the specific situation. It's important to consult with a doctor to determine the appropriate dose for treating recurrent headaches.