Yes, there are some people who can take mefloquine without experiencing problems at all. Therefore, if you've taken mefloquine in the past and you're one of the lucky ones who didn't suffer, then you might well want to take it again because it's the devil you know. Those people will be few and as time goes on they'll be fewer and fewer because the number of people who have taken mefloquine is still shrinking exponentially. I can see a case for keeping it as a last resort, but it should just be there as an absolute last resort for those who specifically want it.
On May 15th, 2019. See this statement in context.