CVS Pharmacy in O FALLON is a neighborhood location open seven days a week, including nights and weekends. The pharmacy team is professional, knowledgeable, and very courteous. They are friendly, on top of things, and always willing to help. The staff addresses all concerns and offers advice with prescriptions, helping to look for savings. They are always ready to provide everyday essentials and support health and wellness needs. Patients receive notifications when medications are available for pickup. While usually very quick, refill times can vary. The pharmacists are knowledgeable and helpful, researching answers to questions if needed. Some customers note that drive-thru service can sometimes be slow or inconsistent, but many are extremely satisfied and recommend this pharmacy.