This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. That combats infection by retroviruses

n. An agent that combats retroviruses.

"The provision of preventative short-term antiretroviral treatment (post-exposure prophylaxis) to survivors of sexual assault had increased dramatically in the past year."