I doubt you saw an ad for PMDD -- companies aren't much into marketing *diseases*.
You likely saw an ad for Sarafem, an FDA-approved SSRI for the treatment of PMDD. Most folks will say it's a new fancy term for PMS, though its definition is a bit more strict and based on recurrent depressive symptoms (dysphoria) as well as physical ones. If your PMS is bad enough to warrant you taking a drug every day for months, and it works, I'm all for it. If it doesn't work, we'll see it disappear in the next few years.
(This makes me laugh: it's the wellbutrin/zyban approach all over again! Sarafem is fluoxetine, otherwise known in the real world as Prozac. See http://www.sarafem.com )
[This message has been edited by Djanaba (edited 11-05-2000).]