"Our health workers are burnt out with seemingly endless number of patients trooping to our hospitals for emergency care and admission", the group, led by the Philippine College of Physicians, said in a letter to the president, as the Southeast Asian nation recorded 4,963 infections of the coronavirus.
Manila's casinos will reach five full months of closure after Philippines President Rodrigo Duterte extended General Community Quarantine across the National Capital Region for another two weeks until 15 August.
"My plea is to endure some more".
The Philippines' health department vowed on Sunday (Aug 2) to update its gameplan against Covid-19 within a week and sought to beef up the healthcare workforce in the capital Manila, where medical frontliners are calling for reviving strict lockdowns. "Many have been infected", Duterte said.
"We are waging a losing battle against COVID-19", it added.
Pharmaceutical companies in countries including China, the United States and Britain are conducting late-stage trials on vaccines.
The Philippines would be given precedence by China in vaccine distribution, he said.
Duterte last week said he had made a plea to Chinese President Xi Jinping to make the Philippines among the first to receive vaccines should one be developed.
The Philippines planned to buy 40 million doses worth $400 million for 20 million people, about a fifth of its 107 million population, said Finance Secretary Carlos Dominguez.
The lockdowns imposed in mid-March are among the world's strictest and longest, and have taken a toll on the country's normally fast-growing economy, with gross domestic product expected to shrink 2% to 3.4% this year, the first contraction in more than two decades.
"Once the vaccine is available I am sure can fully open", Dominguez said.
The Philippines has Southeast Asia's second-highest number of coronavirus infections after Indonesia, with cases up almost five-fold to 89,374 and deaths more than doubling to 1,983 since the tough lockdown was eased in June.