The Prime Minister feels Labour MP Austin Mitchell was "quite wrong" to liken Pfizer to "rapists" in a Twitter post, his official spokesman has told reporters.
Asked if David Cameron thought Mr Mitchell should be disciplined by his party, the spokesman said, "He does think this is something for the Labour Party."
Mr Mitchell's original tweet also suggested Mr Cameron "dare not stop Pfizer because he dare not offend the US in any way".
Veteran Labour MP Austin Mitchell sought to calm the row brewing over his tweet likening Pfizer to "rapists" by posting on Twitter:
Mr Mitchell also compared his earlier comments to those made by "people everywhere" who "decry the rape of [the] rainforest".
Veteran MP Austin Mitchell has apologised to Labour's chief whip after he compared US drug giant Pfizer to "rapists" over its proposed takeover of British rival AstraZeneca.
"The chief whip has made clear to Austin Mitchell this tweet was unacceptable. He has now apologised for what was an obvious error of judgment," a Labour spokesman said.
Minister for Women Nicky Morgan has called for disciplinary action after Labour MP Austin Mitchell likened Pfizer to "rapists" on Twitter.
Urging Labour leader Ed Miliband to suspend him from the party, Ms Morgan tweeted:
A veteran Labour MP has been reprimanded over an "unacceptable" remark likening US drug giant Pfizer to "rapists" over its bid to take over British rival AstraZeneca.
Austin Mitchell sparked outrage after he criticised David Cameron on Twitter writing:
His comments came after Labour leader Ed Miliband accused the Prime Minister of putting ideology before British jobs in his approach to the proposed deal.