LOS ANGELES - Charlie Sheen is no longer HIV positive after having taken medication for years, according to TMZ.

The entertainment news website cited sources to say that the actor, who is expected to discuss his HIV status on United States television on Tuesday, has known for more than two years that he was HIV positive.

"We're told Charlie was taking meds for the HIV and has had a series of blood tests, and over time, the virus has been 'undetectable' in his system," it reported today.

The sources said the former Two And A Half Men star admits to having had intimate relations with many sexual partners after his diagnosis.

But they said the actor is insisting that he had not deceived anyone as the disease was now "undetectable".

Radar Online, however, said not having traces of HIV in his blood does not mean he is HIV-negative.

It cites a medical expert as saying that there is no known cure for HIV, the virus that causes Aids.

An HIV positive patient can keep the disease at "undetectable" levels by using anti-retroviral drugs.

But once a person has HIV, he or she will have it for life, at least until medical advances provide a cure.

Sheen, who was fired in 2011 from Two And A Half Men set after a much-publicised spat with Warner Bros over his behaviour, was making his HIV status public because several former partners were threatening him with lawsuits, reported AFP.

TMZ claimed the 50-year-old actor had kept his HIV diagnosis confidential, sharing it only with several friends - who spread the information.