DEERFIELD, Ill. — Walgreen Co. has relaunched its web site, adding a variety of healthy living and product resources, expanding the shopping tools and services it offers, and making the site easier to navigate.

The new web site introduces innovative features that make it easier to manage prescriptions online, photo service enhancements, new mobile applications and a selection of interactive tools to help consumers better understand and monitor their health.

“Walgreens.com has long been a trusted source for health and wellness information,” asserts senior vice president of e-commerce Sona Chawla.

“We pride ourselves on having the most convenient locations throughout the U.S., and now Walgreens is adding greater convenience for our growing numbers of customers who shop with us online. We’ve integrated our content, products and services to offer customers a more holistic online solution.”

Research by the online tracking company compete.com shows that, with an average of more than 13 million visits per month, walgreens.com is the most popular web site among drug store retailers.

The new site includes several enhanced pharmacy options that build on the company’s already comprehensive online prescription services.

Walgreens.com has launched several new options under the pharmacy tab, adding convenience and flexibility for patients who manage and order their medications online.

The site’s express refill feature, for instance, lets customers enter a prescription number online for in-store pickup at their preferred Walgreens location and choose when they want to pick up their medication. Patients who provide an e-mail address can be notified via e-mail when prescriptions are ready.

Similarly, an auto-refill feature processes refills automatically and sends the patient an e-mail notification when a prescription is ready for pickup. The site’s refill reminder e-mails work in the same way, notifying patients when their maintenance prescriptions are due for a refill.

The site’s Health Shops offer a selection of products, health care resources, care guides and calculators that show a patient’s risk for heart disease and other important conditions.

Executives say that the world of online retailing is becoming increasingly competitive, and hope the new site will help drive more of that business to Walgreens.