Aim: Access to essential medicines is a key component of managing patients in ambulatory care. In 2008, the State of Minas Gerais, Brazil, created the Pharmacy Network of Minas (Rede Farmácia de Minas [RFM]) program to improve access to medicines, increasing availability and restructuring the infrastructures. The aim was to assess the current situation, comparing municipalities with and without RFM. Materials & methods: Descriptive survey study, data collected from 2014 July to May 2015. Availability was verified by stock levels. Results: The drug availability index was 61.0%, higher in municipalities with RFM. Most physicians considered the pharmaceutical services as good/very good. The main reasons for medicines shortage were ‘financial transference problems’, ‘insufficient financial resources’ and ‘budget’. Conclusion: Strategies, such as the RFM can promote improvements in medicine availability.