Yaz, a prescription birth control from Bayer Pharmaceuticals, has been reported to generate serious side effects in its users. Side effects include deep vein thrombosis, stroke, pulmonary embolisms, heart attacks, gallbladder disease, and sudden death. Bayer is also the maker of Yasmin, which the devastating side effects have also been associated with. The generic version of Yaz, known as Ocella, has also been linked with cases of sudden death.