President Andrzej Duda greenlighted the measure at a special ceremony on Tuesday after it was approved by Poland's parliament.
Under the law, an estimated 11.5 million Poles, including some 7 million children and youth, will gain access to free medication, according to officials.
Previously free medicines were available to seniors over the age of 75, some 4 million people in total, Polish state news agency PAP reported.
Now the number of those eligible will increase to around 16 million and the programme will be worth PLN 2.4 billion (EUR 540 million, USD 580 million) a year, the Polish government said.
Moreover, the number of medicines covered by the programme will almost double to 4,000, according to officials.
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Source: IAR, PAP, TVP Info