Robert Drennan, M.D.

Practice: Cardiovascular Institute of the South

Specialty: Cardiology, Internal Medicine: Electrophysiologist

Office locations: Baton Rouge and Zachary

Most recent review: 3 days ago New
4.9 out of 5
1.6K Ratings
694 Comments

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.

4.9 out of 5
1.6K Ratings
694 Comments

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.

Awesome love him

Rated 5 out of 5 stars
(3 days ago) Nov-2026

Dr Drennan has been my cardiologist since 2015

Rated 5 out of 5 stars
(1 week ago) Oct-2026

Always willing to spend as much time as I need.

Rated 5 out of 5 stars
(1 week ago) Oct-2026

I love Dr Drennan and his staff. It’s like talking to family !!

Rated 5 out of 5 stars
(1 week ago) Oct-2026

5

Rated 5 out of 5 stars
(1 week ago) Oct-2026

Best cardiologist, ever him and his staff are excellent.Recommend to anyone

Rated 5 out of 5 stars
(2 weeks ago) Oct-2026

I was scared to death before my Watchman procedure. Dr Drennan sat with my wife and I for about an hour patiently answering dozens of questions from a frightened retiree. Afterwards, I scheduled my procedure because he was soooo calm cool and collected with the confidence of a master surgeon....which is what he is! Absolutely 💯 love this Doctor for taking all of that time to ease my fears!

Rated 5 out of 5 stars
(2 weeks ago) Oct-2026

Dr. Drennan is very pleasant and has an excellent bedside manner which I believe is extremely important in Patient care.

Rated 5 out of 5 stars
(2 weeks ago) Oct-2026

My first visit … he took plenty of time to review my previous records from Texas cardiologist

Rated 5 out of 5 stars
(2 weeks ago) Oct-2026

Dr. Drennan never makes me feel rushed or unseen. He comes in prepared to talk about why I’m there and he doesn’t ever try to rush out before he knows I’ve had all my questions answered. His nurses are all kind and make coming into the office a painless much less stressful thing. I appreciate all of them.

Rated 5 out of 5 stars
(2 weeks ago) Oct-2026
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