GPs and patients who are frustrated by the shortage of the new flu vaccine for people over 65 are notified that the final delivery batch arrives by Saturday.
NHS England said there would be enough vaccines for everyone to be protected before the winter.
But doctors' leaders said that GPs and patients should be given more guidance in order to avoid disturbing the supply of supplies gradually.
Older adults are advised to have the flu injection by early December.
This gives time to protect against the flu start cycling, usually later in the month.
However, the supply of the vaccine over 65's from the Seqirus maker to GPs and pharmacies means that some older patients have not been able to get vaccinated.
Appointments have been canceled
In a survey of 650 GPs in Pulse, almost 70% said that there was a shortage of this flu vaccine.
That meant they could not vaccinate as many elderly patients as they would have liked.
Some GPs said they had to cancel appointments while others said it had created staffing problems.
But an English NHS spokesman said this week, "the manufacturer will have introduced 100% of the vaccines to those surgeries and pharmacists who ordered them on time".
"So the public can be assured that there is enough supply of vaccine in stock for everyone to be protected before the winter."
Dr Richard Vautrey, chairman of the GP in the British Medical Association (BMA), said that it had not been an easy time for GPs.
"As practices begin to plan for next year, the English NHS must learn lessons of the impairment seen in recent weeks.
"All practices must be adequately alerted and directed to all practices before the booking period, to allow both surgeries and a manufacturer to ensure that there are no further supply problems for next year.
"Improving information to the public would also be beneficial," he said.
& The best protection against the flu & # 39;
Public Health in England said that the remedial flu vaccine, designed to help older people's immune systems is fighting off the flu, is worth it.
Dr Mary Ramsay, head of immunizations at PHE, said: "We encourage all older adults to get an appointment with their GP or pharmacist by the beginning of December before the flu accumulates later in the month.
"However, it's always worth getting a vaccination even if it's possible in the winter – it's the best defense we have against an unpredictable virus."
The new flu vaccine is also available to people over 65 in Wales and Northern Ireland.
In Scotland, only for those over 75 years of age.