A prescription drug that can prevent the spread of HIV, the virus that causes AIDS, is available in Central New York. Elizabeth Reddy, MD, urges people at high risk for transmission to talk to their primary care doctors about Truvada. Reddy is the medical director of the Designated AIDS Center Clinic at Upstate. She says Truvada is up to 90 percent effective at preventing the spread of HIV in people who take the the medication daily, as instructed. Reach the clinic by calling 315-464-5533.