President Trump announced the debut of a website on Thursday night to help Americans use their own money to buy prescription drugs.

The government website, TrumpRx.gov, will not sell medications. Instead, it provides an entry point for consumers to search for their drugs and then buy them elsewhere, either from pharmacies or websites offered by major manufacturers to buy medications directly.

Mr. Trump and two administration officials unveiled the site at an event in an auditorium of the Eisenhower Executive Office Building, which is adjacent to the White House. Dr. Mehmet Oz, who oversees Medicare and Medicaid, predicted that the offering of fertility drugs would lead to a boom in “Trump babies.”

The president talked up the site as a way for Americans to get the lowest prices. “We’re going to save a lot of money and be healthy,” he promised.

Mr. Trump has struck a series of deals with major drugmakers, promoting his efforts to lower drug prices at a time when Democrats try to use the issues of affordability and the cost of living against him heading into the midterm elections. The president persuaded the companies to reduce some prices and return production to the states, in exchange for avoiding his threatened tariffs on drugs made in other countries.

But researchers who study drug pricing warned that many people would pay too much if they use TrumpRx.