Dr. Robert Drennan is board-certified in internal medicine, cardiology, nuclear cardiology and clinical electrophysiology. Dr. Drennan is a member of the American College of Cardiology, the Heart Rhythm Society, and the American Society of Nuclear Cardiology. He has earned many awards, such as the Douglas Scholarship and the College of Charleston Founder’s Scholarship.
Dr. Robert Drennan is board-certified in internal medicine, cardiology, nuclear cardiology and clinical electrophysiology. Dr. Drennan is a member of the American College of Cardiology, the Heart Rhythm Society, and the American Society of Nuclear Cardiology. He has earned many awards, such as the Douglas Scholarship and the College of Charleston Founder’s Scholarship.
The reviews listed below were collected independently of Cardiovascular Institute of the South through rater8. Each review represents an authentic and verified patient experience.
He’s the best cardiologist around
(3 days ago)
May-2026
He is such a patient and kind provider. He shows genuine concern and compassion for his patients and is knowledge is unlike no other! I love Dr. Drennan!
(6 days ago)
May-2026
100,000 ++++++++ Dr Drennan is absolutely the best hands down!!!! I’m so blessed to have him as my doctor.!!!
(6 days ago)
May-2026
He’s on point and an excellent communicator. I’ve never had a worry about my heart being in his capable hands. His mind is pretty capable too!
(1 week ago)
Apr-2026
Dr Drennan is a great doc. I trust him as a professional and like him as a man...
(1 week ago)
Apr-2026
Great “bedside manner”, takes his time to discuss issues, and makes you feel like he has all the time in the world to sit and talk at every visit. Love his staff as well…April, Brie, and his NP Chris. Highly recommend.
(1 week ago)
Apr-2026
I’ve been seeing Dr Drennan for about 3 years. He is the best! Always caring about the needs of his patients and always going to ask the right questions to get to the root of the problem.
(1 week ago)
Apr-2026
Dr. Drennan is an excellent physician.He was calm and caring; he did not rush, answered all my questions and made me feel cared for from start to finish.
His entire staff were helpful and kind.
Dr. Drennan is exceptional as a physician and as a person.
(1 week ago)
Apr-2026
Dr. Drennan is professional and friendly, excellent physician.
(1 week ago)
Apr-2026
Smart. Compassionate. Communicative. Quick and easy check-in process. Staff were sweet as well.
Dr. Robert Drennan is an electrophysiologist with CIS in Baton Rouge and Zachary. He completed his Bachelor of Science degree in biochemistry and molecular biology, as well as a Bachelor of Arts degree in chemistry, at the College of Charleston in South Carolina. He earned his doctorate of medicine from the University of South Carolina School of Medicine in Columbia, South Carolina. He completed a residency in internal medicine from the Tulane University School of Medicine in New Orleans. He also completed both his cardiology and electrophysiology fellowship at the Louisiana State University Health Science Center in New Orleans.
Dr. Drennan is board-certified in internal medicine, cardiology, nuclear cardiology and clinical electrophysiology. He previously worked at Touro Infirmary, and he also worked as a lab assistant at the Medical University of South Carolina and at the College of Charleston.
Dr. Drennan is a member of the American College of Cardiology, the Heart Rhythm Society, and the American Society of Nuclear Cardiology. He has presented, researched and written for numerous publications on a variety of topics including sudden cardiac arrest, atrial fibrillation, and peripheral arterial disease. He has earned many awards, such as the Douglas Scholarship and the College of Charleston Founder’s Scholarship.
See other doctors in Cardiovascular Institute of the South
He’s the best cardiologist around
He is such a patient and kind provider. He shows genuine concern and compassion for his patients and is knowledge is unlike no other! I love Dr. Drennan!
100,000 ++++++++ Dr Drennan is absolutely the best hands down!!!! I’m so blessed to have him as my doctor.!!!
He’s on point and an excellent communicator. I’ve never had a worry about my heart being in his capable hands. His mind is pretty capable too!
Dr Drennan is a great doc. I trust him as a professional and like him as a man...
Great “bedside manner”, takes his time to discuss issues, and makes you feel like he has all the time in the world to sit and talk at every visit. Love his staff as well…April, Brie, and his NP Chris. Highly recommend.
I’ve been seeing Dr Drennan for about 3 years. He is the best! Always caring about the needs of his patients and always going to ask the right questions to get to the root of the problem.
Dr. Drennan is an excellent physician.He was calm and caring; he did not rush, answered all my questions and made me feel cared for from start to finish. His entire staff were helpful and kind. Dr. Drennan is exceptional as a physician and as a person.
Dr. Drennan is professional and friendly, excellent physician.
Smart. Compassionate. Communicative. Quick and easy check-in process. Staff were sweet as well.