I have taken Cozaar for 8 years, never had a problem. My dose was 100 mg at night and 50 mg in morning. Suddenly out of the blue my blood pressure spiked to 185/135 and my heart went into a continuous fibrilation that lasted 2 hours. I felt dizzy and faint and sick tomy stomach. I went to emergency room but everything checked out ok. My pressure was high and has stayed higher than usual for a week. I still feel a little dizzy and my heart flutters occassionaly. Wonder if anyone else has had this experience after taking cozaar for a length of time?