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The structure and operating procedures of Hospital Pharmacy and Therapeutics Committees are similar in select Western countries. Information from clinical trials is the most influential factor in the decision-making process.

The "LESS-CHRON criteria" are the result of a comprehensive and standardized methodology to identify clinical situations for deprescribing drugs in chronic patients with multimorbidity. Geriatr Gerontol Int 2017; 17: 2200-2207.

Background Drug interactions (DIs) are a significant cause of medication-related problems. The aging population, high chronic diseases prevalence and polypharmacy are closely associated factors. Aim of the review To study the prevalence, types and associated factors of DIs in multimorbidity patients of over 65 years of age in primary care. Methods Relevant studies on DI prevalence in this population were reviewed in PubMed, Cochrane Library and EMBASE (January 2000-December 2015). Independent variables (duration, target population, age, sex, mean of drugs and diseases, geographical localization, DI databases used and study designs) and dependent variables (prevalence, number of DIs per 100 patients and per patient, number of clinically-relevant DIs per 100 patients, most common DI and associated factors) were classified for each article. Results The search generated 749 articles and 46 duplicates were discarded. After reviewing, 10 articles were included. Seven studies were observational and 3 were quasi-experimental. Seven out of 10 used interaction databases. Only 2 studies described both actual and potential DIs. The prevalence of multimorbidity patients with DI ranged from 25.1 to 100% and the number of DIs per 100 patients was from 30 to 388.3. All the lower values correspond to the study conducted at the nursing home. This could be due to special care offered in these centres, where the medication is more controlled. The most frequent DIs were reported in five articles. However, these results could not be correlated since they were ranked using different methodologies. ACEIs, diuretics and NSAID were the most common therapeutic groups. Finally, 5 studies identified factors associated with the presence of potential DIs. The number of drugs and age were the most significant factors. Conclusions There is little evidence of prevalence of actual and potential DIs in elderly patients with multimorbidity in outpatient settings, showing widely heterogeneous results.

Spanish P&T Committees have a similar structure and function, a multi-disciplinary professional composition to carry out an important assessment activity. This activity is higher in large hospitals and in university hospitals. The proportion of the approved and rejected drugs is similar in different types of hospital. The Therapeutic Interchange Guidelines, the use of application models and the reports follow the indications of scientific collaborative groups, thus being used more in Spain than in other countries.

What is known and Objective: Psoriasis is a chronic skin disease for which there is an increasing range of treatment options. Biological agents (ustekinumab, adalimumab, infliximab and etanercept) are indicated for moderate-to-severe plaque-type psoriasis in adults who fail to respond to, have a contraindication to, or are intolerant to other systemic therapies including cyclosporine, methotrexate and PUVA Unfortunately, with new drugs, the pivotal trials leading to their licensing are often placebo-controlled trials rather than comparative trials vs. established therapies. Therefore, inference on comparative effectiveness of the newer agents must be derived indirectly, through estimation of effects of the new agents vs. a common comparator. The objective of this study is to compare the relative efficacy of the biological agents through a systematic review of the indirect clinical trial evidence. Methods: A systematic literature search was performed for clinical trials of biological agents in psoriasis. Pivotal, randomized, double-blind, controlled (placebo) trials using intention-totreat analysis were selected for detailed analysis. Trials must include PASI 75 as a primary end point. The indirect comparison was performed using the method of Bucher adjusted with the ITC calculator (Indirect Treatment Comparisons of the Canadian Agency for Drugs and Technologies in Health), etanercept being the reference drug. We defined delta value for therapeutic equivalence as a difference in the efficacy of 25% among the different treatment options. Results and Discussion: Fourteen studies (four for ustekinumab, three for adalimumab, three for infliximab and four for etanercept) were included. The indirect comparison results reveal that ustekinumab, adalimumab and infliximab were statistically superior to etanercept with an absolute risk difference for PASI 75 of 12% (95% CI = 5Á9-18%), 11% (95% CI = 5Á3-16Á7%) and 24% (29Á7-18Á3%) respectively. However, in all situations, the 95% confidence interval does not achieve clinical relevance as no delta exceeds the previously set value (25%). What is new and Conclusion: Ustekinumab, adalimumab, infliximab and etanercept can be regarded as clinical equivalents for the treatment of psoriasis. Choice between these agents therefore depends on their relative safety profiles, individual contraindications and cost effectiveness.Correspondence: M. Galv an

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There is a large number of studies on the prevalence of drug interactions in hospitals but they report widely varying results. The prevalence is higher in patients with heart diseases and elderly people.