(Updates with statement from K-V in the seventh through ninth paragraphs. Adds new stock quote in the fifth paragraph.)

Shares of K-V Pharmaceutical Co. (KVA, KVB) dropped after the Food and Drug Administration said it won't take action against pharmacies that create a cheaper alternative for a K-V treatment that prevents preterm labor in pregnant women.

Specifically, the FDA refuted a letter K-V sent to pharmacists warning the agency would take enforcement action against pharmacies that use a compound based on a valid prescription for a patient.

The news comes after two U.S. senators earlier this month requested the Federal Trade Commission investigate anticompetitive behavior after the treatment, which obtained seven years of exclusivity under the Orphan Drug Act last month, saw a dramatic cost increase.

The FDA said it only takes such actions if the products are unsafe, of substandard quality or are not being compounded according to appropriate standards.

K-V's shares slid 33% to $4.75 in recent trading on Wednesday.

The drug, commonly known as Makena, is a weekly injection of progesterone. K-V was given orphan status for Makena last month, and the cost has risen to $1,500 per injection--much higher than the cost of the treatment that had been given by U.S. pharmacies at a cost of $10 to $20 per injection. Orphan status in the U.S. typically brings U.S. market exclusivity for an extended period and other incentives if the treatment is approved.

Later Wednesday, K-V said it is "committed to ensuring that this significant, FDA-approved medication is covered at an affordable cost and accessible to all women who are prescribed Makena." K-V said it is finalizing solutions to the concerns and will announce those moves by the end of the week.

K-V said to allow broader access, the company activated a patient financial assistance program to help reduce out-of-pocket costs for qualified patients. It said the level of assistance has already exceeded many federal program guidelines for health-care subsidies.

In defending Makena, K-V said it believes the FDA-approved treatment is "in the best interest of patients," adding the manufacturing process is tightly controlled to ensure quality and consistency.

-By John Kell, Dow Jones Newswires; 212-416-2480; john.kell@dowjones.com

 
 
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