All Mercy services are open. See safe options for care and the latest COVID-19 vaccine information.
Your favorite Dierbergs Pharmacy team has joined Mercy. You can expect the same exceptional quality and service with a seamless transition from Dierbergs to Mercy. All provider prescriptions are welcome.
Find answers to pharmacy FAQs.
Like your doctor, your pharmacist plays an important role in helping you maintain your well-being. When you choose Mercy's Pharmacy at Dierbergs Deer Creek Crossing in O’Fallon, located at Highways K and N, you’ll have a pharmacist who can assist you, not only with routine prescriptions but with hard-to-find and hard-to-fill ones as well.
At Mercy, we offer compassionate care for a variety of treatment services, including:
Mercy makes it quick and easy to refill or renew. Get started.