Pfizer Inc. will sell nearly two dozen of its patent-protected drugs and vaccines at not-for-profit prices to some of the world’s poorest countries.

Under the program, Pfizer will begin shipping the medicines first to Ghana, Malawi, Rwanda, Senegal and Uganda before the end of this year, Chief Executive Albert Bourla said in an interview.

The arrangement means that some of the drugs that carry list prices of tens of thousands of dollars a year in the U.S. would be substantially less for the low-income countries to buy, according to Pfizer.