Background A wide range of effective antiretroviral therapy (ART) regimens with favourable side effects are available. More than 70% of HIV care costs in the Netherlands are attributed to ART. We developed an ART algorithm to proactively switch virologically suppressed individuals to a more cost-effective HIV treatment.Methods This prospective study implemented our ART algorithm in two large Dutch HIV clinics, where a pharmacist screened ART regimens for 1 year. Individuals were considered suitable for a switch if their current ART exceeded