Walmart has already introduced the nationwide, same-day pharmacy delivery in six states: Arkansas, Missouri, New York, Nevada, South Carolina, and Wisconsin. Walmart plans to make the service available to customers in 49 states by 2025.

Walmart's medications are securely packaged in tamper-evident packaging, and customers can track their orders in real time through the Walmart app or website. Walmart has expanded its delivery capabilities, integrating prescription medications and general merchandise into one streamlined single order for delivery.

U.S. retailer Walmart on Tuesday said it will start delivering prescription medicines and medication refills along with groceries and other items as a single order within 30 minutes, upping the ante in its delivery competition against Amazon Inc.

Walmart said it is planning to offer same-day pharmacy delivery services in an effort to make filling or refilling prescriptions more convenient for its customers.

Walmart's previous efforts to dispatch prescription medications typically took at least five to seven business days.

Delivery services can reduce cost and save people time, but pharmacy stores remain an important place for certain health services, such as vaccination. Here's what to know.

Walmart has begun a pilot program that delivers to people's doors prescription drugs and other items they order and pay for online.