Yes, it has long been known to be dangerous. As have some other combined oral contraceptive pills.
however, it is a miracle worker re acne and greasy skin. I used to be prescribed it by the gp until it was discovered that I had a blood condition increasing my chances of clotting. And had a DVT.
Nothing else has improved my skin ever as much as Dianette. Even though I am now 45 I still have coarse oily skin, bit spotty still. The dianette gives me fine pored, perfect textured skin. Sigh..