LOS ANGELES — A new class of powerful cholesterol-reducing drugs is showing promising results, potentially offering a new option for people who do not respond to medication now on the market, according to studies presented at a conference of heart specialists here on Monday.

Although the final word on the effectiveness of the drugs is still a few years away, the results so far are so promising that pharmaceutical companies are racing to bring them to market.

In early- and middle-stage trials, use of the experimental drugs reduced so-called bad cholesterol by about 40 to 70 percent in a matter of weeks, equivalent to the reduction achieved by the most effective statins like Lipitor. But it appears that the new drugs can be used along with statins, lowering cholesterol even further.

“With these drugs, together with statins, you can get virtually everyone to the goal,” Dr. Frederick Raal of the University of the Witwatersrand, in Johannesburg, South Africa, who presented one of several studies on these new drugs at the American Heart Association’s scientific meeting here.