BENTONVILLE, Ark. -- Wal-Mart Stores Inc., the world's biggest retailer, said today that it would offer 90-day prescriptions for $10 and lower the prices of more than 1,000 over-the-counter medications to $4 or less.

The company said the offerings were the third phase of its $4 prescription program.

Beginning today, Wal-Mart said it would begin filling prescriptions for up to 350 generic medications at $10 for a 90-day supply.

The company said with the over-the-counter medication price rollbacks, about one-third of its over-the-counter medicines are now $4 or lower.

The company said it also added several women's medications to its list of prescriptions available for $9. The medications include alendronate, the generic version of osteoporosis medication Fosamax.