In 2015, Wiener authored legislation to make San Francisco the first city in the country to require water recycling in new developments. He also proposed legislation to require each unit in multi-unit buildings have their own water submeters. Early in his first term, Wiener requested a study of the economic impacts of entertainment and nightlife, an issue in his first campaign. The study, completed by the San Francisco City Economist, found San Francisco nightlife generated $4.2 billion in economic productivity in 2010. In 2013, Wiener authored legislation to make it easier for businesses to get permits for DJs, and to offer a new permit to allow for live music in plazas. In September 2014, Wiener announced in an online essay on the Huffington Post that he was taking Truvada, a pre-exposure prophylaxis (PrEP) that reduces the risk of HIV infection. Wiener stated that he disclosed his usage of PrEP in an effort to reduce the stigma around taking the HIV prevention medication. Wiener also cited the need for more awareness and expanding access as other keys for making PrEP successful. He also worked with David Campos to support ensuring low-cost access to Truvada for pre-exposure prophylaxis against HIV after announced his own PrEP use. As a member of the Board's budget committee, Wiener advocated for HIV/AIDS services and restoring lost federal funds. In 2016, he helped secure funding for San Francisco's Getting to Zero effort, which aims to end all new HIV infections in San Francisco. In 2016, Wiener authored first-in-the-country legislation to require fully paid parental leave for new parents after childbirth or adoption, applying to both parents. As a result of this legislation, employers in San Francisco must give employees up to six weeks of paid time off. In 2014, Wiener introduced a ballot measure that would have imposed a two cents per ounce tax on the distribution of sodas and other sweetened beverages, and used the money to fund "healthy choices" in San Francisco. The measure, which was also sponsored by Supervisors Malia Cohen, Eric Mar, John Avalos, David Chiu and David Campos, aimed to reduce soda consumption and increase programs to combat the rise of diabetes and other related diseases in San Francisco. The endorsement list for San Francisco's sugar beverages tax, Measure E, featured much of San Francisco's local political establishment, including all its state legislators, and many health organizations, but voters in the November 4, 2014 election did not give the measure the ⅔ supermajority required to impose a new tax.