Dr Williams, a well-known Cook Islander, has been fined $10,000 and ordered to pay costs of $145,000.
The online petition set up yesterday was created by a Casey Panapa Jr on Avaaz.org, which is considered to be the world’s largest and most effective online campaigning community for change.
By yesterday afternoon, more than 800 people had signed the petition.
“In 2016, my son was born with eczema. We went to many specialists but nobody could help. Only when we went to Dr Williams did our son’s eczema get cleared,” explained Panapa Jr on the petition page.
“Dr Williams has helped thousands of vulnerable families and eczema sufferers over a career spanning nearly 30 years. His treatments save lives, like the life of my beautiful 2-year-old son Isaiah. This may all stop, because of vested interests want this disease to keep us in poverty.
“Dr Williams saves lives, and the Tribunal may stop all of it and stop Dr Williams from helping people. Let’s help Dr Joe Williams clear his name.”
Dr Williams, who also served as the prime minister of the Cook Islands, was found by the New Zealand Health Practitioners Disciplinary Tribunal to have prescribed a mixture of a potent steroid and an antifungal cream to 12 patients.
According to a report in the New Zealand Herald, the tribunal was concerned the doctor mixed the two medicines without proper analysis of the consequences and adequate formal research.
The tribunal in a summary of the case said a further major factor was that the doctor in many cases prescribed the mixture in the face of concerns being expressed to him by other professionals whose views he should have respected and taken into account.
The tribunal also found Dr Williams provided dietary advice outside accepted medical practice, reports New Zealand Herald.
“As well as being fined and made to pay costs, Williams, who is a GP with a special interest in the treatment of eczema, was censured and conditions imposed on his practice,” the report said.
“He appealed the tribunal’s decision last year to the High Court and lost.”
The 84-year-old from Aitutaki is known for his eczema care therapy treatment process which has transformed the lives of more than 40,000 sufferers across the world.