Britain will put a resolution to the UN Security Council later on Wednesday "authorising necessary measures to protect civilians" in Syria, BBC reported.
The UK's resolution was devised by parliamentary members after Cameron recalled them from their summer break to discuss the escalating developments in Syria.
The resolution will be put forward at a meeting of the five permanent members of the council, UK Prime Minister David Cameron said on Twitter.
Earlier in the day, a team of UN weapons inspectors resumed their work investigating claims of a chemical weapons attack perpetrated by the Syrian regime on August 21.
Despite being blocked by the Russian and Chinese presence in the UN Security Council, UN Secretary General Ban Ki-moon called on the council to act together in a way that will ensure the protection of Syrian civilians.
"The body interested with maintaining international peace and security cannot be 'missing in action'," Mr Ban said, according to BBC.
"The council must at last find the unity to act. It must use its authority for peace," he continued.
"We've always said we want the UN Security Council to live up to its responsibilities on Syria," Mr Cameron said in another message on Twitter.
"Today they have an opportunity to do that," he said. The draft resolution would condemn the "chemical weapons attack by Assad", he added, and will not seek for a regime change.
