The Federal Trade Commission said Friday that it is suing three drug middlemen, accusing them of inflating insulin prices.

Three companies that process about 80% of prescriptions in the United States — Caremark, Express Scripts and OptumRx — have engaged in anticompetitive practices that spur price increases, the

The Federal Trade Commission sued the drug middlemen that health plans use to keep a lid on drug spending, accusing the firms of inflating the price of insulin.The FTC on Friday filed an antitrust and consumer-protection lawsuit against the three largest pharmacy-benefit managers,