Walmart, already partially responsible for the slow demise of America’s drug stores, is launching yet another CVS killer: 30-minute prescription delivery.

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

Walmart will begin delivering prescriptions across the U.S. early next year, as the retailing giant strives to keep pace with rival Amazon in competing for health care dollars. Walmart's new service includes new prescriptions and refills,

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

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.