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A Comparative Study of Five Centrally Acting Drugs on The International Journal of Obesity (2014) 38, 1097–1103 & 2014 Macmillan Publishers Limited All rights reserved 0307-0565/14 www.nature.com/ijo ORIGINAL ARTICLE A comparative study of five centrally acting drugs on the pharmacological treatment of obesity H Suplicy, CL Boguszewski, CMC dos Santos, M do Desterro de Figueiredo, DR Cunha and R Radominski CONTEXT: No long-term studies have compared centrally acting drugs for treating obesity. OBJECTIVE: To compare the efficacy and safety of diethylpropion (DEP), fenproporex (FEN), mazindol (MZD), fluoxetine (FXT) and sibutramine (SIB) in promoting weight loss. DESIGN AND SETTING: A prospective, randomized, placebo (PCB)-controlled study conducted at a single academic institution. PATIENTS: A total of 174 obese premenopausal women. INTERVENTION: Participants randomly received DEP 75 mg (n ¼ 28), FEN 25 mg (n ¼ 29), MZD 2 mg (n ¼ 29), SIB 15 mg (n ¼ 30), FXT 20 mg (n ¼ 29) or PCB (n ¼ 29) daily over 52 weeks. Diet and physical activity were encouraged. MAIN OUTCOME MEASURES: The primary endpoints were changes in body weight and the proportion of women who achieved at least 5% weight loss by week 52 in the intent-to-treat population. Other measurements included anthropometry, safety, metabolic and cardiovascular parameters. RESULTS: Weight loss was greater than PCB ( À 3.1±4.3 kg) with DEP ( À 10.0±6.4 kg; Po0.001), SIB ( À 9.5±5.9 kg; Po0.001), FEN ( À 7.8±6.9 kg; Po0.01) and MZD ( À 7.4±4.9 kg; Po0.01) but not with FXT ( À 2.5±4.1 kg). Ten (33.3%) women lostX5% of their initial weight with PCB, compared with 20 (71.4%; Po0.001) with DEP, 20 (69%; Po0.02) with FEN, 21 (72.4%; Po0.01) with MZD, 22 (73.3%; Po0.001) with SIB and 10 (35.5%) with FXT. Each medically treated group experienced more adverse events compared with PCB (Po0.001). Compared with PCB, constipation was more prevalent with DEP, SIB and MZD (Po0.01); anxiety was more prevalent with DEP (P ¼ 0.01); and irritability occurred more frequently with DEP and FEN (P ¼ 0.02). Significant improvements in the depression and anxiety scores, binge-eating episodes and quality of life correlated with weight loss. CONCLUSION: The centrally acting drugs DEP, FEN, MZD and SIB were more effective than PCB in promoting weight loss in obese premenopausal women, with a satisfactory benefit–risk profile. International Journal of Obesity (2014) 38, 1097–1103; doi:10.1038/ijo.2013.225 Keywords: anti-obesity agents; clinical trial; weight-loss drugs INTRODUCTION drug by increasing catecholamine action.15,16 MZD is a non- Obesity is associated with several morbidities and reduced life amphetaminic, tricyclic derivative that blocks the reuptake of expectancy.1,2 Weight loss improves metabolic abnormalities norepinephrine in the presynaptic neurons and reduces food intake 16–18 and reduces cardiovascular and cancer risk in obese subjects.3–5 by suppressing neurons in the lateral hypothalamus. SIB is the A reduction in body weight can be achieved with non- newest of these drugs; it acts as a reuptake inhibitor of serotonin 19,20 pharmacological strategies, but such approaches are often and noradrenaline in the CNS. FXT (Medley Pharmaceuticals) is unsuccessful and associated with weight regain.6 indicated for the treatment of depression and bulimia nervosa, 21 Different pharmacological therapies have been employed for with no formal indication for the treatment of obesity. However, helping people to lose weight. Many anti-obesity drugs are centrally it is sometimes employed off-label by physicians to promote acting agents, whose mechanisms of action involve cerebral circuits weight loss due to an acute effect via selective inhibition of 22,23 that control food intake and energy expenditure.7–10 The fear of serotonin reuptake in the presynaptic neurons. adverse events and abuse associated with anti-obesity drugs has In most countries, the clinical use of these old anorectic drugs is prevented or limited their use in most countries.11 prohibited or limited to no more than 3 months, which In Brazil, when this study was performed, drugs such as is counterintuitive in a chronic disease such as obesity. These diethylpropion (DEP; Ache´ Pharmaceuticals, Sau Paulo, Brazil), limitations are frequently based on empirical decisions because fenproporex (FEN; Ache´ Pharmaceuticals), mazindol (MZD; Apparenza there is a lack of long-term, well-designed studies that evaluate Drugstore, Curitiba, Brazil) and sibutramine (SIB; Medley Pharma- the long-term efficacy and safety of these agents. More recently, ceuticals, Sau Paulo, Brazil) were used to counteract obesity. DEP SIB was withdrawn from the market due to safety issues related to acts on the central nervous system (CNS); this drug increases the cardiovascular risks.24 The main goal of the present study was release of noradrenaline in the synaptic cleft of the hypothalamic to compare, in a single-blind, randomized, placebo-controlled neurons, thus stimulating noradrenergic receptors and inhibiting design, the efficacy and safety of a 52-week (wk) therapeutic hunger.12–14 FEN (hydrochloride methyl-1-phenyl-2-ethyl-3-amino program with DEP, FEN, MZD, FXT or SIB for promoting weight loss propionitrile) also acts on the CNS as an appetite-suppressing in a group of obese premenopausal women. Endocrine Division (SEMPR), Department of Internal Medicine, Parana Federal University, Curitiba, Brazil. Correspondence: Professor H Suplicy, Department of Internal Medicine, Endocrine Division (SEMPR), Parana Federal University, Avenida Agostinho Leao Junior, 285, Curitiba 80030-110, CEP, Brazil. E-mail: [email protected] Received 4 July 2013; revised 23 October 2013; accepted 24 November 2013; accepted article preview online 29 November 2013; advance online publication, 7 January 2014 Pharmacological treatment of obesity H Suplicy et al 1098 PATIENTS AND METHODS At baseline and at wk 52, all participants were evaluated by a Study design and population psychologist and responded to the following tests: the Beck Depression Inventory25 and the Beck Anxiety Inventory,26 which evaluate the levels of This trial was a prospective, randomized, placebo-controlled study depression and anxiety, respectively; the Binge Eating Scale,27 a self- conducted by a multidisciplinary team at the Obesity Outpatient Clinic of the Endocrine Division (SEMPR) of the Parana Federal University administered questionnaire to assess the severity of binge eating in obese Hospital, in Curitiba, Brazil. The main goal of the study was to compare the individuals; the Short-Form Health Survey (SF-36), a general health questionnaire;28,29 and the Impact of Weight on Quality of Life (IWQOL- efficacy and safety of five different centrally acting medications used to 30 treat obesity during a follow-up period of 52 wks. Efficacy was evaluated LITE). IWQOL-LITE scores range from 0 to 100, with higher scores indicating a better QoL. At these visits, blood samples were collected in the by the differences in weight loss promoted by medications and placebo morning after an overnight fast to determine the serum levels of glucose, and the proportion of patients in each arm who experienced a reduction in the baseline body weight of at least 5% or 10% after 52 wks. The secondary aminotransferase, alanine aminotransferase, total cholesterol, high-density lipoprotein, low-density lipoprotein, TG, insulin and TSH. Insulin resistance endpoints included changes from the baseline values in anthropometric 31 measures (that is, waist circumference (WC), body mass index (BMI)). Safety was calculated in accordance with the Homeostasis Model Assessment. was evaluated by reports of adverse events in the follow-up visits, with an An electrocardiogram (ECG) was performed before the start of the study emphasis on serious events and events that led to the patient’s and was repeated if clinically indicated. Transthoracic echocardiography was performed at baseline and at the end of the study by the same discontinuation. Key secondary safety endpoints included changes from the baseline in measures of blood pressure, heart rate, serum lipids (total operator, with all patients in the left lateral decubitus position, using the cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein same equipment (Sonos 5500, Hewlett-Packard, Andover, MA, USA) with cholesterol and triglycerides (TGs)), glycemic variables (fasting glucose, an electronic multifrequential transducer of 2–4 MHz. fasting insulin, glycated hemoglobin and the homeostasis model assess- ment of insulin resistance) and quality of life (QoL). Statistical analysis Eligible subjects included premenopausal women with ages between To compare the efficacy of the different drugs in promoting weight loss, a 18 and 50 years with a BMI of at least 30 and no more than 40 kg m À 2 52-wk placebo-subtracted total weight loss of at least 5% was considered. who were weight stable within the previous 3 months (variation not It was assumed that roughly 10% of patients in the placebo group would greater than 3 kg). The exclusion criteria were male gender; previous have a weight loss of 5% at the end of the study and the magnitude of the bariatric surgery; menopause; pregnancy or lactation; desire to become effect (the minimum difference between treatment arms to be considered pregnant during the study; uncontrolled hypertension (4160/100 mm clinically relevant) was assumed as 40%. Power was set as 0.8 with an alpha Hg at the time of enrollment); diabetes mellitus; clinically significant level of 0.05, resulting in an estimate minimum sample size
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