Walmart clamps down on opioid prescriptions

Pharmacies at Walmart and Sam's Club stores will start capping initial opioid prescriptions at seven-day supplies, the companies said Monday.

Why it matters: Walmart officials said they are implementing the new limits as a way to prevent and crack down on prescription abuse, which has contributed to the country's opioid crisis. But some clinicians have warned against policies that could inhibit people from getting needed painkillers.