Safeguard (Panacur) is the treatment for Meningeal Worm. Ivomec is the preventative. But you need to do Ivomec monthly. It is your choice. Most people don't do preventative for goats but if your vet does alpacas too, most alpaca people do preventative for M Worm and that is why he is probably suggesting it. This also seems to be a bad year for M worm.