I am a healthy 33 year old female with PMDD. I was recommended to switch to YAZ from my other birth control because I didn't want to take antidepressants. Within 24 hours of taking my first pill, I had every symptom of a heart attack and severe dizziness. I landed in the cardiac unit for five days and had every test including heart cath. The doctor gave me a clean bill of health on my heart, but, told me to immediately stop the YAZ. I had contacted Bayer, they told me that it takes awhile to get into your system and to follow through with the pack. (the doctor said it is only the contraceptive part that takes that long in the system) the medicine is absorbed immediately. If I had kept taking YAZ, I don't know where I would be right now.