Meet our Pharmacists

David Costiniuk, Pharmacist and Ontario Street Pharmacy Owner

Dave, St Catharines Pharmacist

“We don’t stay behind the counter at the pharmacy. We’re in the community, we’re mobile, we go where clients are if they can’t come in. We’re a boutique pharmacy enabling us to tailor our services and approach to the personal needs of our clients.”

Speak with David Costiniuk, one of two pharmacists and the owner at Ontario Street Pharmacy and it becomes clear that he is not content with operating as just another pharmacy. Instead, David’s goal is to adopt a unique approach to providing pharmacy services that are highly personal and meet the unique needs of his clients and community.

To best understand David’s vision all you need to do is follow him on a regular day. He may start off in Niagara Falls explaining and fielding questions about blister pack medication with an elderly gentleman and his adult children. From there, David’s back to St. Catharines to a Group Home explaining medications to a new resident, taking the time to ensure she has all the information she needs and that all of her questions or concerns are answered. Next stop? Hospice Niagara where David’s expertise in pain control is put to use during his daily rounds. Then back to the pharmacy where he’ll meet his customers, new and old, in his usual genuinely helpful fashion.

Jennifer Nitsopoulos, Pharmacist and Owner

Jen, St Catharines Pharmacist

“I became a Pharmacist because I wanted to help people. Everyday I aim to go “above and beyond” by making our pharmacy an accessible and friendly place. My goal is to have customers that are comfortable asking questions and getting information they need to enjoy maximum health possible”. 


Jennifer believes in a one-on-one approach to being a pharmacists and it shows in her work. Her customers feel comfortable that she’s listening, knows their unique situation and is able to collaborate and liaise with doctors and professionals to ensure their medication regime is the best fit.  Like her business partner David, Jennifer was raised and St. Catharines and is very proud to have created a locally owned, small business that is tailored to help its clients on a daily basis. Her goal is to meet the needs of the community she loves and have the opportunity to go above and beyond when helping her customers. Jennifer has created a space where customers feel comfortable and that in turn gives them the confidence to ask questions and raise concerns.


Dr Bertola

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