Government officials, drug companies and medical experts, faced with outbreaks of antibiotic-resistant “superbugs,” are pushing to speed up the approval of new antibiotics, a move that is raising safety concerns among some critics.

The need for new antibiotics is so urgent, supporters of an overhaul say, that lengthy studies involving hundreds or thousands of patients should be waived in favor of directly testing such drugs in very sick patients. Influential lawmakers have said they are prepared to support legislation that allows for faster testing.

The Health and Human Services Department last month announced an agreement under which it will pay $40 million to a major drug maker, GlaxoSmithKline, to help it develop medications to combat antibiotic resistance and biological agents that terrorists might use. Under the plan, the federal government could give the drug company as much as $200 million over the next five years.

“We are facing a huge crisis worldwide not having an antibiotics pipeline,” said Dr. Janet Woodcock, director of the Center for Drug Evaluation and Research at the Food and Drug Administration. “It is bad now, and the infectious disease docs are frantic. But what is worse is the thought of where we will be five to 10 years from now.”