Walmart and Sam’s Club pharmacies said Monday they will soon restrict opioid prescriptions for acute pain to no more than seven days, and restrict dosage to only a 50 morphine milligram maximum per day.

The move aligns the mega chain with recommendations from the Centers for Disease Control, which put out the recommendation as part of an effort to curb overprescribing of powerful painkillers. The policy, which applies to first-time opioid prescriptions for acute pain, is set to take effect in the next 60 days, Walmart Inc. said in a statement Monday.