I guess it depends where you are. If you're out on a front-line post in Afghanistan somewhere, where you're a long way from the medical aid centre—you might be 40 miles away—you're stuck with what drugs are there. It's not going to be possible to switch easily. That really is the difficulty in the military, that you often won't have access under operational conditions to a unit doctor. It will be difficult, quite apart from the fact we've already touched upon, that if you say, “Well, I don't like this drug because it's making me unhappy”, you're just going to make trouble for yourself because of the kind of stigma that is attached in the military to anyone who's reporting psychological unhappiness or distress.
On May 15th, 2019. See this statement in context.