Background: Tracer essential medicines are drugs which fully fulfil a population’s health requirements and ought to be always available allowing for a properly functioning health system all the time. They should be available in the appropriate dosage, adequate amounts and at assured quality at a price that many people and the community can easily afford.Methods: Analytical cross-sectional study design was used. This study utilized a mixed method approach (qualitative, observation and quantitative).Results: The study found out that artemether lumefantrine was the least available drug at 50% in all the sampled facilities with KEMSA cited as the main supplier of tracer essential medicines in these facilities. Policy formulation was done without any involvement of pharmacy in-charges and policies passed at the county management team merely passed onto the staff at the health facilities without their engagement.Conclusions: With the roll out of UHC program, majority of the participants indicated an increase in the availability of essential drugs in Nyeri County hence the government should roll out the program countrywide. Health management and leadership teams in the county needs to engage the pharmacy in-charges during policy making and changes, provide efficient communication in the supply chain system, including proper inventory management systems and to enhance research of drugs and emerging diseases in the county.