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".
More top news
New figures show people aged over 55 could be as much as four times more likely to become victims of a telephone scam .
The fallout of Greece's decision to reject the terms of an international bailout will have repercussions for the rest of Europe.
Largely dry night, but showers set to spread in from the west during tomorrow