The MHRA has also said there is no evidence of toxicity from the unauthorised filler.
Ann Alexander, the solicitor representing the two most seriously affected volunteers, said MHRA report was "totally inadequate".
The Medicine and Healthcare products Regulatory Agency (MHRA) has issued a warning about Herbal Flos Lonicerae (Herbal Xenicol).
But the Welsh government said it was the responsibility of the UK's Medicines and Healthcare products Regulatory Agency (MHRA).
Between 2003 and 2010 more than 20 letters were sent from the MHRA to PIP raising concerns about the implants.
Anyone who experiences side-effects after taking a herbal medicine can report this to the MHRA using its Yellow Card Scheme.
The programme, intended to be temporary, will be monitored by Public Health Wales and Medicines and Healthcare products Regulatory Agency (MHRA).
The request by the MHRA for doctors to send in their experiences is aimed at helping the committee conduct its review.
The MHRA has sent out a letter to the NHS Trusts affected by the recall advising that follow up tests are unnecessary.
The Medicines and Healthcare products Regulatory Agency (MHRA) has already banned the sale of BZP, although it's not an offence to possess it.
The MHRA said all-metal hips had a failure rate of about 12% after seven years, three times that of metal and plastic or ceramic hips.
The Royal College of Psychiatrists welcomed the new advice from the MHRA and said it would ensure it was passed on to its members promptly.
Patients with metal-on-metal hips should be contacted in due course by their orthopaedic surgeon but the MHRA said any patient who was concerned should see their GP.
She called for an independent Inquiry into the conduct of the trial and said that she would be making her concerns about the MHRA known to the health secretary.
The Medicines and Healthcare products Regulatory Agency (MHRA) has issued new advice saying patients with these large head diameter metal-on-metal hips will need monitoring for the life-time of the implant.
But Dr Susanne Ludgate, clinical director of the MHRA, says they had first become aware in 2008 of a small number of cases where patients suffered swelling around the hip and tissue damage.
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