U.S. scientists said more than 50 people who take this medicine for more than four days a week, increasing their risk of developing cancer of the blood over a period of 10 years, can reach one to two percent.
The researchers at the Fred Hutchinson Cancer Research Center in Seattle, draw their conclusions after nearly 65,000 people to include male and female adults from all over the state of Washington who took the drug an average of over six years.
During the study period, 577 people have one percent of the total, blood cancer, such as lymphoma or Mylodysplastic syndrome (MDS).
When they looked at 577 men, they found that people who said to take paracetamol continuously for more than that represented.
Among most of the group not suffering from blood cancer, five percent of them less than four times a week consume paracetamol.
Emily White, one researcher said, "Someone who is aged 50 years or older have a risk of about one per cent within ten years of contracting one of these cancers."
"Our study shows that, if you are taking acetaminophen at least four times a week for four years, will increase the risk to two percent."
However, Dr. David Grant, scientific director of the National Leukemia & Lymphoma Research Charities, said, 'pessimistic' with these findings.
He stressed that the numerical relationship does not prove a causal relationship and can only be a result of the methods the investigators or specificity statistics.
"There is no relevant mechanism of paracetamol which causes cancer," he said.
He added, "Asking parents to recall their consumption of paracetamol over the years is not a reliable way to generate the data."
The increased risk from one to two percent for more than ten years also included a small increase, he said. (Erabaru / Telegraph / voice)