But the US switch in emphasis means that clinics are now being forced to turn new patients away."We had drugs under PEPFAR. We didnt have to turn patients away," he told AFP.
While PEPFAR expanded access to medicine, new HIV infections rose.
So, when PEPFAR was up for renewal the new administration of President Barack Obama demanded greater focus on preventing new infections.
"We have all lost momentum on the prevention front and were paying for it now in the form of rising prevalence," PEPFARs Kampala-based spokeswoman Lynne McDermott told AFP in an email.
The difficult economic climate meant spending more on prevention necessitated cutbacks on treatment in a country where the infection rate is 6.4 percent in a population of 31 million.
Patients who are already enrolled in a PEPFAR programme will continue receiving free drugs, but most clinics have been told to stop acquiring new patients.
Mugyenyi accuses the United States of breaking its promise to Uganda. "They have changed their programme very regrettably," he said.
"The number one thing is availability of treatment. Any other programme, whatever name they call it, will fail."
Douglas Mugabi, a thin, softly spoken farmer who lives just outside Kampala, told AFP that he and his wife tested positive in 2003, and, when his health deteriorated in 2006, he began receiving free drugs.
Last year, his wifes condition also worsened.
"When I came in and we found out there was no longer a free programme I became cold," the 48-year-old said. "My wife is worried because the drugs are expensive, but according to our means, we couldnt support a life-long treatment."
Mugyenyi said many patients have similar stories.
"PEPFAR promised them that if they need treatment they would get it," he claimed. "So the US should not say they are keeping their promise."
McDermott said the US cannot continue treating an ever-increasing number of patients and that unless new infections are reduced Ugandans will always be faced with drug shortages.
She noted that PEPFAR continues to provide two thirds of all HIV/AIDS money in Uganda, and urged Uganda "to identify other resources to fill the remaining gap."
Other resources are not readily available in Uganda, or elsewhere on the continent.
In a November report Medicins Sans Frontiere detailed freezes on ART spending across Africa.
The report accused PEPFAR of "reneging on promises made last year," but also apportioned part of the blame to the Global Fund, the public-private partnership which disburses extra funds to treat HIV/AIDS, tuberculosis and malaria.
Eric Goemaere, an HIV specialist with MSF who has worked in several southern African nations described the notion of spending more on prevention to slow the epidemic as a "fake argument".
He said any prevention strategy relies on people getting tested.
"Why were people getting tests? It is because treatment was available.
"If you look at the facts, it does not make any medical sense to cut back on treatment," he insisted.
One concern is that people like Mugabi might begin sharing their free drugs with a sick friend or family member.
When patients dont take their drugs as proscribed they are more likely to develop a drug resistant strain of HIV. So pill sharing can be catastrophic.
Mugyenyi told AFP he is "panicking".
"We are heading to carnage. Carnage which had been put to a stop," he said. "There is no prevention programme that can succeed without treatment."
