Background Almost 300 million people suffer from asthma, yet many in low-and middle-income countries have difficulty accessing essential asthma medicines. Availability, price and affordability of medicines are likely to affect access. Very few studies have included asthma medicines, particularly inhaled corticosteroids, in these countries. Reflections about international reference prices (IRPs) are generally absent from pricing studies, yet some IRPs may be masking the extent of access problems. Objectives Our objective was to determine the availability, pricing and affordability of beclometasone, budesonide and salbutamol, the three asthma medicines on the World Health Organization's Model List of Essential Medicines (EML) in selected low-and middle-income countries and to reflect on the appropriateness of using IRPs. Methods A cross-sectional pricing survey was conducted in 52 countries. Data were collected on country demographics including national currency, $US exchange rate and daily wage of the lowest-paid unskilled government worker. Pricing and availability data were collected for salbutamol, beclometasone and budesonide in two private retail pharmacies, the national procurement centre and a main public hospital.

INTRODUCTION: New Zealand's Pharmaceutical Management Agency (PHARMAC) manages the list of medicines available for prescribing with government subsidy, within a fixed annual medicines budget. PHARMAC achieves this through a mix of pricing strategies including reference pricing. In 2011, PHARMAC applied generic reference pricing to olanzapine tablets. AIM: This study sought to evaluate change in outcome measures of patients switching from originator to generic olanzapine consequent to the introduction of the policy. METHODS: A retrospective study using national health data collections was conducted. Outcome measures included medicines indicators (change in dosage, concomitant therapy and treatment cessation), health care service indicators (use of emergency departments, hospitals and specialist services), surveillance reports of adverse events, and mortality. RESULTS: Subsequent to the removal of funding for originator brand olanzapine tablets, 99.7% of patients meeting the inclusion criteria switched to using generic olanzapine. Limited case reports of suspected therapeutic loss were received in the study time period. No increase in use of additional oral or injectable antipsychotic medication was observed after switching, nor any increase in other unique, non-antipsychotic prescription items. However, a high incidence of multiple switching between available brands was found. No net impact of switching brands on health service utilisation or mortality was found. DISCUSSION: The study shows that a switch can be made safely from originator olanzapine to a generic brand, and suggests that switching to generics should generally be viewed more positively. Generic reference pricing achieves considerable savings and, as a pricing policy, could be applied more widely. KEYWORDS: Antipsychotic agents; drug costs; drugs, generic; olanzapine

This study evaluated patient health outcomes and any impact on healthcare costs consequent to the implementation of generic reference-pricing of risperidone in New Zealand using national datasets. Reference pricing risperidone reduced the price of the originator brand by 50 % as well as overall expenditure on risperidone tablets. Half of all patients made a single switch to generic risperidone, with the remainder making multiple switches between brands. 1.5 % made a switch-back to the originator brand. No difference was found in use of healthcare services between switchers and non-switchers of the originator brand or versus the comparator group. This refutes the available literature on brand-to-generic and generic-to-generic switching.

Switching from brand to generic lamotrigine is largely devoid of adverse health outcomes; however, creating an incentive to ensure a greater proportion of patients switch to generic lamotrigine is required to achieve maximal financial savings from a policy of generic reference pricing.

Although both products remain fully subsidized and available, there is little incentive for prescribers, pharmacists, or patients to switch to the less expensive generic brand. If savings to the national New Zealand budget are to be realized, additional policy measures should be implemented to minimize incentives for multiple and reverse switching, and prescribers, as key opinion leaders, could take the lead in promoting generics to their patients.