Swiss pharmaceutical company Roche Holding AG on Tuesday said it has lifted restrictions on the distribution of influenza treatment Tamiflu and is now shipping orders to all markets.

The company said it previously was distributing Tamiflu only to U.S. cities where a high incidence of influenza was being reported. The drug has been in high demand amid concerns about a possible bird flu pandemic in people.

Roche said it made the decision after seeing an increase in flu reports in the United States and an advisory by the Centers for Disease Control and Prevention urging doctors to avoid using two older flu drugs this season.

“We are prepared to meet seasonal demand for Tamiflu, including any increase stemming from CDC’s recent announcement,” George Abercrombie, president and chief executive of Roche unit Hoffmann-La Roche Inc., said in a statement.