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There is significant variation in prescriptions among countries in clinical practice for the treatment of comorbidities associated with autism spectrum disorder (ASD). It has been suggested that many people with mental health disorders in low-/middle-income countries do not receive adequate treatment. Hence, this study investigated psychopharmacological treatment patterns for ASD comorbidities in 30 countries and the association between country's income and prescription rates. The IMS Prescribing Insights database was used to investigate prescription patterns for ASD comorbidity treatment from 2007 to 2012. Data were obtained from 30 countries in continents of Europe, Asia, Oceania, Central America, South America, and Africa. The gross domestic product (GDP) per capita was used as a proxy for each country's income. Spearman correlation was used to examine the association between prescription rate and GDP per capita. The highest prescription rates were found in Western Europe (3.89-36.36/10,000) while the lowest prescription rates were found in Asian countries, such as Turkey, Indonesia, Saudi Arabia, and Pakistan (0.04-0.82/10,000). The most commonly prescribed drug for ASD comorbidity treatment in most of the countries was risperidone, but antidepressants and antiepileptic drugs were also frequently prescribed. There was a significant positive correlation between GDP per capita and prescription rate (Spearman ρ = 0.60; P = 0.0011; 95% confidence interval 0.27-0.81), that is, the higher the GDP per capita, the higher the prescription rate. There are marked international differences in prescription rates, and this is partially accounted by economic factors. Future research should combine more data for ASD comorbidity treatment to explore the disparity of psychopharmacological treatment between countries., (© 2014 International Society for Autism Research, Wiley Periodicals, Inc.)

Rationale: Previous studies on psychotropic drugs prescribing in autism spectrum disorder (ASD) were from the USA or the UK. However, these studies may not be generalizable to other countries. There is a need to understand the extent of psychopharmacological prescribing for ASD treatment at a multinational level to identify areas of prescribing which lack evidence., Methods: We used the IMS Prescribing Insights database to investigate psychotropic drugs prescribing patterns for ASD treatment in children and adults in 2010-2012. Data were obtained from Europe (France, Germany, Italy, Spain and UK), South America (Mexico and Brazil), North America (Canada and USA) and Asia (Japan)., Results: North American countries have the highest prescription rates, followed by the European and South American countries. Prescribing rates were higher in children compared to adults in individual countries. The most commonly prescribed drug for ASD was risperidone in young people (except in UK and Japan). In the UK, methylphenidate (34 %) was the most commonly prescribed for young people and haloperidol (44.1 %) in Japan. In adults, the most commonly prescribed drug class was antipsychotics and particularly risperidone (thioridazine and ziprasidone were the most prescribed antipsychotics in Brazil and USA, respectively)., Conclusion: There is variation in medication prescription for people with ASD among countries, which may be attributable to diagnostic criteria, clinical guidelines or health care systems. However, there is a lack of evidence of efficacy and safety for many psychotropic drugs prescribed for people with ASD. Research is needed to bridge the evidence gaps in prescribing.