The producers of the anti-viral drug, Tamiflu, have said that tests on animals have shown the drug is an effective treatment for the deadly H5N1 strain of the bird flu virus if administered early.
However, Roche said that more studies were needed into how much Tamiflu should be given in order to effectively combat the virus in humans.
It comes a day after research published in the prominent medical journal, The Lancet, in which doctors said they had found no evidence that Tamiflu was effective against bird flu.
Many governments have already stockpiled the drug to ward off a potential bird flu pandemic as recommended by the World Health Organisation, which has said it will not change its advice for governments to stockpile the drug despite questions over its efficacy.
Meanwhile, the Turkish government has announced a $40 million aid package for poultry firms hit by bird flu, including compensation for culled chickens and postponement of tax and debt payments.
Sales are said to fallen dramatically in Turkey's domestic poultry market while a number of countries have imposed import bans on Turkish poultry products.
Some 1.1 million poultry have been slaughtered in Turkey since the bird flu outbreak emerged two weeks ago. 21 human cases have been reported so far, including four deaths.
