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

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

On the most recent drug take-back day, more than 31,000 pounds of unused medication was collected in Pennsylvania alone.

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

With constantly changing schedules in our daily lives, Walmart has introduced a new method to receive your medication without leaving your home. On Tuesday, Walmart announced its pharmacy will offer a delivery service for new prescriptions and refills.

Walmart is jumping into same-day prescription drug delivery in direct competition with its rival Amazon and struggling drugstores. Why it matters: It's the latest battleground in a rapidly changing pharmacy retail industry.