I've had undetectable levels of HIV while on meds for well over a decade. I'm on Aripla now. My testosterone suddenly (3 years between tests) dropped from normal to extremely low levels. Why would undetectable levels of hiv cause my testosterone to drop so dramatically in 3 years? When they say hiv/aids can cause low levels aren't they talking about people with aids or detectable levels of hiv? Thanks.

You don't indicate your age, whether you have any other medical conditions, and what the testosterone levels were and are now. It is unlikely, given your undetectable viral load (and therefore HIV being under control), although still remotely possible, that HIV itself could cause this. Older age and other medical conditions can contribute to low testosterone levels, which if too low, should be increased with testosterone replacement therapy.