The FDA bans the nonsteroidal anti-inflammatory drug (NSAID) Phenylbutazone (Bute) in all food-producing animals.
Separately, tests will be conducted for possible residues in horsemeat of phenylbutazone, also known as "bute".
Food firms have also been testing products for the veterinary medicine bute (phenylbutazone).
Phenylbutazone is a veterinary medicine whose use in livestock, including horses, is illegal.
Horsemeat should also be tested for the drug phenylbutazone, the European Commission said.
Any companies that have found horsemeat in their products have also been testing for the veterinary painkiller phenylbutazone, known as bute.
Phenylbutazone, also known as bute, is not allowed to enter the food chain because it can pose a risk to humans.
Asda is recalling all corned beef from its budget range after traces of the veterinary drug phenylbutazone were found in some batches.
Chief among food inspectors' concerns is that the illicit horsemeat could contain the veterinary drug phenylbutazone, or "bute, " commonly used to treat horses.
CNN: Meat industry under scrutiny as horsemeat scandal spreads
Meat from animals treated with phenylbutazone is not allowed to enter the food chain as it may pose a risk to human health.
The major worry with such deceptions is that horses that have been treated with phenylbutazone - or "bute" - could enter the food chain.
Further work is being carried out to establish exactly how much horsemeat these products contain and to test for the presence of the veterinary medicine phenylbutazone, or bute.
The FSA has asked Findus to test their contaminated beef lasagne for the veterinary drug phenylbutazone as animals treated with "bute" are not allowed to enter the food chain.
The U.K.'s Food Standards Agency on Thursday said it found traces of drug phenylbutazone, a painkiller and anti-inflammatory known as bute, in eight of some 200 horse carcasses it tested.
And there is no animal evidence either that it is a carcinogen, he added, saying that "phenylbutazone is not classifiable as to its carcinogenicity" according to the International Agency for Research on Cancer.
While horsemeat itself is not considered a food safety risk, its unauthorized use in certain products has raised concerns it could contain the veterinary drug phenylbutazone, or "bute, " commonly used to treat horses.
Asda has also recalled tinned Chosen By You Corned Beef (340g) as a precaution - even though the product has not tested positive for phenylbutazone - because it was made in the same factory.
He said there was "no convincing evidence" of phenylbutazone's carcinogenicity in humans "because in the individuals studied many other drugs had also been taken and any one of these might have caused the cancers seen".
The three arrests came after the FSA said on Thursday tests had found eight horses, killed in the UK, had tested positive for the equine painkiller phenylbutazone (bute) and that six may have entered the food chain in France.
Fears over the rogue horse meat surfaced after it was discovered that eight out of 206 horse carcasses checked between January 30 and February 7 tested positive for the drug phenylbutazone, widely known as bute, the UK Food Standards Agency said.
One of the four drugs used on this horse was a common form phenylbutazone that you probably recognize as as a Non-steroidal anti-inflammatory drug used for pain management in horses as ubiquitously used only through veterinarian controlled pharmaceutical sale to horse owner or trainer.
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