When I worked in West Africa I took Savarine for a little bit, until I woke up one day with my lips swollen like crazy, so I quit it, never got Malaria, I used to out in the field by myself so I was told to take HALFAN with me and if I felt sick just pop the pills and ride it out.
I saw a few of the Peace Corps guys go a little crazy with Mefloquine BTW. Not recommended.