Mercy Pharmacy - Dierbergs Deer Creek Crossing

Pharmacy
2979 Highway K
O Fallon, MO 63368


Phone: (636) 379-8910
Fax: (636) 530-3017
Hours:
Monday-Friday: 8 a.m.- 8 p.m.; Saturday: 8 a.m. - 6 p.m.; Sunday 10 a.m. - 4 p.m.
Mercy is now in Dierbergs

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.

Why Choose Mercy Pharmacy?

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.

Mercy Pharmacy Services in O'Fallon MO

  • Liquid flavoring
  • Flu shots
  • Immunizations
  • Injectable medications
  • Same-day service
  • 24/7 online refills