Southwest General Hospital

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Westside Gastroenterology


Southwest General Medical Group, Inc. – Westside Gastroenterology specializes in the diagnosis and treatment of patients with disorders of the esophagus, liver, gallbladder, stomach, pancreas, small intestine and colon. Our physicians have years of experience in evaluating and caring for patients with all types of gastroenterological conditions. Our board-certified physicians provide individual care and attention to each patient and combine clinical expertise with advanced technology to provide high quality, compassionate care close to home.

Phone Calls

Phone calls are accepted during regular business hours
Monday - Friday: 9 a.m. - 5 p.m.

The office phone number is 440-816-4546. If you need to speak with a physician after hours, please leave a message with the answering service to have the physician paged. The doctor will return your call as soon as possible. If you have an emergency, please go to the closest Emergency Room or call 911! 

Appointment Scheduling

To schedule an appointment, call the office at 440-816-4546. Some same-day appointments may be available. If you need to cancel or re-schedule an appointment, please call the office so that we can use the time to accommodate other patients. You should bring your insurance card and a photo ID with you to all appointments.

Prescriptions and Refills

We do not accept FAX requests from your pharmacy for Rx refills.  Please call the office if you need a refill.  Most requests can be processed within 48 business hours.  If you have a refill request after hours please call the office at 440-816-4546 and wait for the prompt to be connected to our pharmacy refill line and follow the instructions.


Test Results

Please call the office 3-5 business days after your test is completed for your results. 

Forms and Policies

View our Privacy Policy as well as other office Forms and Policies in the "Forms" section to the right.

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Westside Gastroenterology

Office Location

Main Campus
7255 Old Oak Blvd., C-412
Middleburg Heights, OH  44130
Phone: 440-816-4546
Fax: 440-816-4549
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6115 Powers Blvd., Ste. 303
Parma, OH 44129
Phone: 440-743-2801
Fax: 440-743-2804
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Strongsville Medical Center
18181 Pearl Road, Suite B-202
Strongsville, OH 44136
Phone: 440-816-4546
Fax: 440-816-4549
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Our Physicians

Mazen Issa, MD, FACG
Nitin Davessar, MD
Newton Muthunayagam, MD

Office Hours

Main Campus
Monday - Friday:  9 a.m. - 5 p.m.

Monday & Tuesday: 1 p.m. - 5 p.m.
Thursday: 8 a.m. - 5 p.m.

Strongsville Medical Center
Friday: 8 a.m. - noon
*Dr. Issa only