Was a long time ago, one of the early prozac family that they don't hand out anymore because of the side effects, an ssri inhibitor. Just get an up to date one if you are going this route. Note though they are still horrible so plan to be off them as quick as you can be. The important thing about this story though, and I think about most people's attempts to use drugs to control their stutter is that it was the learning to make sounds correctly whilst not bothered by social anxiety that led to fluency. Drugs on their own are not what stopped my problem, work was put in to change my speech and it wasn't any of this slow onset shite. Today you can find resources for this on YouTube, learn how each sound is really made, where to put your tongue, should you be breathing out or not, shape of mouth,etc. Decades ago you couldn't.