You have to consult with your doctor at home before you leave home for Everest Base Camp Trek and do accordingly from your doctor’s advice. We know that many of the trekkers use Diamox even for the prevention propose and even it may have some side effect. There will be our guide to suggest you and you must inform to the guide that if you are going to take Diamox. We can buy it in Kathmandu if you want to use it and our guide also will have it, if in case you need on the trek.