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
1.5K Ratings
684 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
1.5K Ratings
684 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.

Very pleasant and very informative he made sure that I understood my problem

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

Dr. Drennen is a very knowledgeable doctor. He is also very nice. If you don’t understand something, he will definitely take his time and explain..

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

He is an amazing doctor! Kind and compassionate and always explains what is going on with me. Never rushes our appointments. I highly recommend him.

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

Excellent

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

He is a great doctor

Rated 5 out of 5 stars
(5 days ago) Oct-2026

Extremely courteous and professional, and very cordial!

Rated 5 out of 5 stars
(6 days ago) Oct-2026

He's GREAT! He knows his stuff and is VERY pleasant!

Rated 5 out of 5 stars
(6 days ago) Oct-2026

Excellent

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

I had a positive experience with Dr. Drennan during my first few visits. He appeared genuinely invested in his patients’ well-being and was genuinely concerned about their concerns. However, my recent appointment left me feeling disheartened. It seemed as though Dr. Drennan was not actively listening to my concerns and was somewhat dismissive of them. The person who came before him, or perhaps his PA, was particularly insensitive. While she may have intended to be friendly, her behavior was so over-the-top that it made me feel like she was making light of my concerns. I feel that I wasted my time with this appointment. Although they are the experts, I am certain they possess the knowledge and experience to address my issues effectively. However, the overall demeanor of the medical staff made me feel worse than I did when I first arrived. Essentially, Dr. Drennan advised me to consult my primary care doctor.

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

He’s the best, truly the absolute best!!

Rated 5 out of 5 stars
(2 weeks ago) Oct-2026
See other doctors in Cardiovascular Institute of the South