ABSTRACT
The use of first-line drugs in clinical practice for attention deficit hyperactivity disorder (ADHD) is limited by their adverse effects. Many novel monoamine reuptake inhibitors (MRIs) with better safety profiles and comparable efficacy are also being tried for ADHD. This network meta-analysis (NMA) has evaluated the efficacy and safety of MRIs in ADHD. The data was extracted from 31 relevant clinical trials after a literature search on MEDLINE/PubMed, Embase, Scopus, Cochrane databases, and clinical trial registries. Quality assessment was performed using the risk of bias assessment tool (RoB2) by Cochrane Collaboration, and the random-effects model was used to estimate the effect size. Standardised mean difference (SMD) and 95% credible interval(95%CrI) were reported for the reduction in ADHD rating scale score. Network geometry was visualised, and node splitting was done for the closed triangles. Meta-regression was done for the duration of therapy. PRISMA-NMA guidelines were followed in selecting, analyzing, and reporting findings. The drugs showing significant reduction on the ADHD rating scale as compared to placebo are bupropion (SMD: 0.33; 95%CrI: 0.60,-0.059), dasotraline(SMD: 0.49; 95%CrI: 0.82,-0.16), venlafaxine(SMD: 0.71; 95%CrI: 1.3,-0.15), viloxazine(SMD: 0.45; 95%CrI: 0.77,-0.12). Other drugs (centanafadine, duloxetine, edivoxetine, reboxetine, tipepidine, vortioxetine) were no better than placebo in reducing symptom severity of ADHD. The efficacy of none of the drugs was found to be significantly different as compared to methylphenidate. Among all, duloxetine (OR:15; 95%CrI:1.8130) showed significantly more treatment-emergent adverse events than methylphenidate. In conclusion, venlafaxine, viloxazine, and bupropion are the most efficacious MRIs for ADHD symptom reduction as compared to placebo with high certainty of evidence.
Subject(s)
Attention Deficit Disorder with Hyperactivity , Bayes Theorem , Network Meta-Analysis , Humans , Attention Deficit Disorder with Hyperactivity/drug therapy , Neurotransmitter Uptake Inhibitors/pharmacology , Neurotransmitter Uptake Inhibitors/administration & dosage , Neurotransmitter Uptake Inhibitors/adverse effects , Outcome Assessment, Health CareABSTRACT
INTRODUCTION: Adrenergic neurotransmitter reuptake inhibitors are gaining attention in treatment for attention-deficit hyperactivity disorder (ADHD). Due to their effects on norepinephrine, dopamine, and serotonin neurotransmission, they benefit both ADHD and comorbid disorders and have some other advantages including longer duration of action and fewer adverse effects compared to stimulants. There is continued interest in these agents with novel mechanisms of action in treatment of ADHD. AREAS COVERED: The authors conducted a PubMed literature search using the following key words: 'ADHD' AND 'adrenergic reuptake inhibitors' OR 'nonstimulants' OR 'atomoxetine' OR 'Viloxazine' OR 'Dasotraline' OR 'Centanafadine' OR 'PDC-1421' OR 'Reboxetine' OR 'Edivoxetine' OR 'Bupropion' OR 'Venlafaxine' OR 'Duloxetine.' They reviewed FDA fact sheets of available medications for safety/tolerability studies and reviewed published clinical studies of these medications for treatment of ADHD. EXPERT OPINION: Adrenergic neurotransmitter reuptake inhibitors fit the diverse needs of children and adolescents with ADHD with 1) poor tolerability to stimulants (e.g. due to growth suppression, insomnia, rebound irritability, co-morbid depression, anxiety and tic disorders, substance abuse or diversion concerns), 2) cardiac risks, and/or 3) need for extended duration of action. Their differences in receptor affinities and modulating effects support the unique benefits of individual agents.
Subject(s)
Attention Deficit Disorder with Hyperactivity , Humans , Attention Deficit Disorder with Hyperactivity/drug therapy , Child , Adolescent , Adrenergic Uptake Inhibitors/therapeutic use , Adrenergic Uptake Inhibitors/pharmacology , Adrenergic Uptake Inhibitors/adverse effects , Central Nervous System Stimulants/therapeutic use , Central Nervous System Stimulants/adverse effects , Central Nervous System Stimulants/pharmacology , Animals , Neurotransmitter Uptake Inhibitors/therapeutic use , Neurotransmitter Uptake Inhibitors/pharmacology , Neurotransmitter Uptake Inhibitors/adverse effectsABSTRACT
Serotonergic medications are used for the prevention and treatment of depression during pregnancy. Selective serotonin reuptake inhibitors and serotonin-norepinephrine reuptake inhibitors (SNRIs) can cause poor neonatal adaptation, which has been attributed to withdrawal versus toxicity. Bupropion, a norepinephrine-dopamine reuptake inhibitor, is often used as an adjunctive agent to selective serotonin reuptake inhibitors or SNRIs for refractory depression. Quetiapine, an atypical antipsychotic, may also be used in more complex cases. When combined with serotonergic drugs, bupropion and quetiapine are associated with increased risk of serotonin syndrome in adults. We describe a neonate exposed to venlafaxine (an SNRI), bupropion, and quetiapine in utero who presented nearly immediately after birth with encephalopathy and abnormal movements. The severity and rapidity of symptoms may be attributable to potentiation of venlafaxine's serotonergic effects by bupropion and quetiapine. Neonatal providers should be aware of maternal medications and prepare for possible adverse effects, particularly from common psychotropic exposures.
Subject(s)
Antidepressive Agents/adverse effects , Bipolar Disorder/drug therapy , Brain Diseases/chemically induced , Dyskinesia, Drug-Induced/etiology , Neurotransmitter Uptake Inhibitors/adverse effects , Pregnancy Complications/drug therapy , Stress Disorders, Post-Traumatic/drug therapy , Antidepressive Agents/therapeutic use , Brain Diseases/congenital , Brain Diseases/diagnosis , Bupropion/adverse effects , Bupropion/therapeutic use , Drug Therapy, Combination , Dyskinesia, Drug-Induced/congenital , Dyskinesia, Drug-Induced/diagnosis , Female , Humans , Infant, Newborn , Male , Neurotransmitter Uptake Inhibitors/therapeutic use , Pregnancy , Quetiapine Fumarate/adverse effects , Quetiapine Fumarate/therapeutic use , Venlafaxine Hydrochloride/adverse effects , Venlafaxine Hydrochloride/therapeutic useABSTRACT
Solriamfetol (Sunosi™) is an orally active, selective dopamine and norepinephrine reuptake inhibitor that was recently approved in the USA as a treatment for excessive daytime sleepiness (hypersomnia) associated with narcolepsy and obstructive sleep apnoea (OSA). Norepinephrine and dopamine influence various physiologic functions, including sleep-wake regulation, and excessive sleepiness has been linked with dysregulation of dopaminergic and norepinephrine systems. This article summarizes the milestones in the development of solriamfetol leading to this first approval as a treatment for excessive daytime sleepiness associated with narcolepsy and OSA.
Subject(s)
Disorders of Excessive Somnolence/drug therapy , Dopamine Uptake Inhibitors/pharmacokinetics , Dopamine Uptake Inhibitors/administration & dosage , Dopamine Uptake Inhibitors/adverse effects , Dopamine Uptake Inhibitors/therapeutic use , Dose-Response Relationship, Drug , Drug Approval , Humans , Narcolepsy/drug therapy , Neurotransmitter Uptake Inhibitors/administration & dosage , Neurotransmitter Uptake Inhibitors/adverse effects , Neurotransmitter Uptake Inhibitors/pharmacokinetics , Neurotransmitter Uptake Inhibitors/therapeutic use , Norepinephrine/metabolism , Sleep Wake Disorders/drug therapy , Treatment Outcome , United States , United States Food and Drug AdministrationABSTRACT
Solriamfetol (JZP-110), a selective dopamine and norepinephrine reuptake inhibitor with wake-promoting effects, is renally excreted â¼90% unchanged within 48 hours. Effects of renal impairment and hemodialysis on the pharmacokinetics and safety of 75-mg single-dose solriamfetol were evaluated in adults with normal renal function (n = 6); mild (n = 6), moderate (n = 6), or severe (n = 6) renal impairment; and end-stage renal disease (ESRD) with and without hemodialysis (n = 7). Relative to normal renal function, geometric mean area under the plasma concentration-time curve from time zero to infinity increased 53%, 129%, and 339%, and mean half-life was 1.2-, 1.9-, and 3.9-fold higher with mild, moderate, and severe renal impairment, respectively. Renal excretion of unchanged solriamfetol over 48 hours was 85.8%, 80.0%, 66.4%, and 57.1% in normal, mild, moderate, and severe renal impairment groups, respectively; mean maximum concentration and time to maximum concentration did not vary substantially. Decreases in solriamfetol clearance were proportional to decreases in estimated glomerular filtration rate. Geometric mean area under the plasma concentration-time curve from time zero to time of last quantifiable concentration increased 357% and 518% vs normal in ESRD with and without hemodialysis, respectively, with half-life >100 hours in both groups. Over the 4-hour hemodialysis period, â¼21% of solriamfetol dose was removed. Adverse events included headache (n = 1) and nausea (n = 1). Six days after dosing, 1 participant had increased alanine and aspartate aminotransferase, leading to study discontinuation. While these adverse events were deemed study-drug related, they were mild and resolved. Results from this study combined with population pharmacokinetic modeling/simulation suggest that solriamfetol dosage adjustments are necessary in patients with moderate or severe but not with mild renal impairment. Due to significant exposure increase/prolonged half-life, dosing is not recommended in patients with ESRD.
Subject(s)
Carbamates/pharmacokinetics , Kidney Failure, Chronic/metabolism , Neurotransmitter Uptake Inhibitors/pharmacokinetics , Phenylalanine/analogs & derivatives , Renal Insufficiency/metabolism , Adult , Aged , Carbamates/adverse effects , Carbamates/blood , Carbamates/urine , Female , Humans , Kidney/metabolism , Kidney Failure, Chronic/therapy , Male , Middle Aged , Models, Biological , Neurotransmitter Uptake Inhibitors/adverse effects , Neurotransmitter Uptake Inhibitors/blood , Neurotransmitter Uptake Inhibitors/urine , Phenylalanine/adverse effects , Phenylalanine/blood , Phenylalanine/pharmacokinetics , Phenylalanine/urine , Renal DialysisABSTRACT
Background: Suicidal ideations, suicide attempts, and fatal suicides are rare adverse drug reactions to antidepressant drugs, but they essentially are clinically relevant. Drawing on a larger dataset of the European drug surveillance program, the present naturalistic study updates a previous contribution (Stübner et al., 2010). Methods: First an analysis of the comprehensive data collected in 81 psychiatric hospitals from 1993 to 2014 by the European drug surveillance program Arzneimittelsicherheit in der Psychiatrie was made. All documented single cases of suicidal ideations or behavior judged as adverse drug reactions to antidepressant drugs were carefully assessed as to their clinical features and drug prescriptions. Results: Among 219,635 adult hospitalized patients taking antidepressant drugs under surveillance, 83 cases of suicidal adverse drug reactions occurred (0.04%): 44 cases of suicidal ideation, 34 attempted suicides, and 5 committed suicides were documented. Restlessness was present in 42 patients, ego-dystonic intrusive suicidal thoughts or urges in 39 patients, impulsiveness in 22 patients, and psychosis in 7 patients. Almost all adverse drug reactions occurred shortly after beginning antidepressant drug medication or increasing the dosage. Selective serotonin reuptake inhibitors caused a higher incidence of suicidal ideation and suicidal behavior as adverse drug reactions than noradrenergic and specific serotonergic antidepressants or tricyclic antidepressants, as did monotherapy consisting of one antidepressant drug, compared to combination treatments. Conclusions: The study supports the view that antidepressant drug-triggered suicidal ideation and suicidal behavior (primarily with selective serotonin reuptake inhibitors) are rare. Special clinical features (restlessness, ego-dystonic thoughts or urges, impulsiveness) may be considered as possible warning signs. A combination therapy might be preferable to antidepressant drug monotherapy when beginning treatment.
Subject(s)
Antidepressive Agents/adverse effects , Suicide , Adult , Drug Therapy, Combination/adverse effects , Europe , Female , Hospitalization , Humans , Male , Middle Aged , Neurotransmitter Uptake Inhibitors/adverse effects , Product Surveillance, PostmarketingSubject(s)
Antipsychotic Agents/adverse effects , Neurotransmitter Uptake Inhibitors/therapeutic use , Tardive Dyskinesia/drug therapy , Tetrabenazine/analogs & derivatives , Valine/analogs & derivatives , Humans , Neurotransmitter Uptake Inhibitors/adverse effects , Tardive Dyskinesia/chemically induced , Tardive Dyskinesia/metabolism , Tardive Dyskinesia/physiopathology , Tetrabenazine/adverse effects , Tetrabenazine/therapeutic use , Treatment Outcome , Valine/adverse effects , Valine/therapeutic use , Vesicular Monoamine Transport Proteins/antagonists & inhibitors , Vesicular Monoamine Transport Proteins/metabolismABSTRACT
BACKGROUND: The reproductive safety of selective reuptake inhibitor (SRI) antidepressants needs to be established to provide optimal control of maternal depression while protecting the fetus. OBJECTIVE: To define a child's neurodevelopment following prenatal exposure to SRIs and to account for genetic and environmental confounders in a sibling design using the Toronto Motherisk prospective database. METHOD: Intelligence and behavior of siblings prenatally exposed and unexposed to SRIs were assessed by using the Wechsler Preschool and Primary Scale of Intelligence-Third Edition, Child Behavior Checklist, and Conners Parent Rating Scale-Revised and subsequently compared. Mothers, diagnosed with depression using DSM-IV, were assessed for intelligence quotient (IQ) and for severity of depressive symptoms with the Center for Epidemiologic Studies Depression scale. Prenatal drug doses and durations of exposure, child's age, child's sex, birth order, severity of maternal depression symptoms, and Full Scale IQ, the primary outcome measure, of both the mother and the child were considered in the analyses. RESULTS: Forty-five sibling pairs (ages 3 years to 6 years 11 months, prenatally exposed and unexposed to SRIs) did not differ in their mean ± SD Full Scale IQs (103 ± 13 vs 106 ± 12; P = .30; 95% CI, -7.06 to 2.21) or rates of problematic behaviors. Significant predictor of children's intelligence was maternal IQ (P = .043, ß = 0.306). Severity of maternal depression was a significant predictor of Child Behavior Checklist Internalizing (P = .019, ß = 0.366), Externalizing (P = .003, ß = 0.457), and Total scores (P = .001, ß = 0.494). Drug doses and durations of exposure during pregnancy did not predict any outcomes of interest in the exposed siblings. CONCLUSIONS: SRI antidepressants were not found to be neurotoxic. Maternal depression may risk the child's future psychopathology. The sibling design in behavioral teratology aids in separating the effects of maternal depression from those of SRIs, providing stronger evidence in clinical decision-making.
Subject(s)
Child Behavior Disorders/chemically induced , Depression/drug therapy , Intelligence/drug effects , Neurotransmitter Uptake Inhibitors/adverse effects , Pregnancy Complications/drug therapy , Prenatal Exposure Delayed Effects/chemically induced , Registries/statistics & numerical data , Siblings , Child , Child Behavior Disorders/epidemiology , Child, Preschool , Depression/epidemiology , Female , Humans , Male , Ontario , Pregnancy , Pregnancy Complications/epidemiology , Prenatal Exposure Delayed Effects/epidemiology , Severity of Illness IndexABSTRACT
BACKGROUND: This study sought to investigate the efficacy of duloxetine for the treatment of obsessive-compulsive disorder (DSM-IV). METHODS: Twenty individuals were enrolled in a 17-week, open-label trial of duloxetine at Massachusetts General Hospital. Data were collected between March 2007 and September 2012. Study measures assessing obsessive-compulsive disorder symptoms, quality of life, depression, and anxiety were administered at baseline and weeks 1, 5, 9, 13, and 17. The primary outcome measures were the Yale-Brown Obsessive Compulsive Scale and Clinical Global Improvement scale. RESULTS: For the 12 study completers, pre- and posttreatment analyses revealed significant improvements (P<.05) on clinician- and self-rated measures of obsessive-compulsive disorder symptoms and quality of life. Among the 12 completers, more than one-half (n=7) satisfied full medication response criteria. Intention-to-treat analyses (n=20) showed similar improvements (P<.05) on primary and secondary study outcome measures. CONCLUSION: The results of this study suggest that duloxetine may provide a significant reduction in symptoms for patients with obsessive-compulsive disorder. ClinicalTrials.gov NCT00464698; http://clinicaltrials.gov/ct2/show/NCT00464698?term=NCT00464698&rank=1.
Subject(s)
Neurotransmitter Uptake Inhibitors/therapeutic use , Obsessive-Compulsive Disorder/drug therapy , Psychotropic Drugs/therapeutic use , Thiophenes/therapeutic use , Adolescent , Adult , Anxiety/drug therapy , Anxiety/physiopathology , Depression/drug therapy , Depression/physiopathology , Duloxetine Hydrochloride , Female , Follow-Up Studies , Humans , Male , Middle Aged , Neurotransmitter Uptake Inhibitors/adverse effects , Obsessive-Compulsive Disorder/physiopathology , Obsessive-Compulsive Disorder/psychology , Psychiatric Status Rating Scales , Psychotropic Drugs/adverse effects , Quality of Life , Thiophenes/adverse effects , Treatment Outcome , Young AdultABSTRACT
OBJECTIVE: To assess short-term efficacy and safety of desvenlafaxine 50 and 100 mg/d versus placebo for treating major depressive disorder (MDD). Assessment of sexual function was a secondary objective. METHOD: Outpatients (≥ 18 years) who met criteria for MDD from the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision and had screening and baseline 17-item Hamilton Depression Rating Scale (HDRS17) total scores ≥ 20 were randomly assigned to placebo or desvenlafaxine 50 or 100 mg/d in an 8-week study conducted from October 2011 to August 2012. The primary efficacy end point was change from baseline in HDRS17 total score at week 8, analyzed using a mixed-effects model for repeated measures. Sexual function was assessed using the Arizona Sexual Experiences Scale (ASEX). RESULTS: The safety population included 909 patients (intent-to-treat population, n = 886). Significantly greater improvement in adjusted mean HDRS17 total score from baseline to week 8 was observed for desvenlafaxine 50 mg (-11.28; P = .006) and desvenlafaxine 100 mg (-11.67; P < .001) compared with placebo (-9.71), with adjustment for multiplicity. In the ASEX total score analysis (n = 422), the treatment by gender interaction was not significant; thus, genders were combined for subsequent analyses. Comparisons for desvenlafaxine versus placebo for change from baseline in ASEX total and all item scores found P > .05, with no adjustment for multiplicity. Rates of sexual dysfunction based on ASEX were comparable among treatment groups. CONCLUSIONS: These results support previous findings demonstrating antidepressant efficacy, safety, and tolerability of desvenlafaxine 50 and 100 mg/d versus placebo. Sexual function was comparable between desvenlafaxine and placebo. TRIAL REGISTRATION: ClinicalTrials.gov identifier: NCT01432457.
Subject(s)
Cyclohexanols/pharmacology , Depressive Disorder, Major/drug therapy , Neurotransmitter Uptake Inhibitors/pharmacology , Sexual Dysfunction, Physiological/chemically induced , Adult , Cyclohexanols/administration & dosage , Cyclohexanols/adverse effects , Desvenlafaxine Succinate , Double-Blind Method , Female , Humans , Male , Middle Aged , Neurotransmitter Uptake Inhibitors/administration & dosage , Neurotransmitter Uptake Inhibitors/adverse effects , Treatment OutcomeABSTRACT
RATIONALE: BMS-820836 is a novel antidepressant that selectively inhibits the reuptake of serotonin, norepinephrine, and dopamine. OBJECTIVE: This Phase I study assessed safety, tolerability, and pharmacokinetics of multiple daily doses of BMS-820836 in healthy subjects. Central serotonin transporter (SERT) and dopamine transporter (DAT) occupancy were assessed using positron emission tomography and [(11)C]MADAM or [(11)C]PE2I, respectively. METHODS: Fifty-seven healthy volunteers were enrolled in this double-blind, placebo-controlled, ascending multiple-dose study (ClincalTrials.gov identifier: NCT00892840). Eight participants in seven dose cohorts received oral doses of BMS-820836 (0.1-4 mg) or placebo for 14 days to assess safety, tolerability, and pharmacokinetics. Additionally, SERT and DAT occupancies were evaluated in 4-8 subjects per cohort at 8 h post-dose on Day 10 and 24 h post-dose on Day 15 at anticipated steady-state conditions. RESULTS: Most adverse events were mild to moderate; there were no serious safety concerns. Median maximum concentrations of BMS-820836 were observed at 4.0-5.5 h post-dose; estimated elimination half-life was 44-74 h. About 80 % striatal SERT occupancy was achieved after multiple doses of 0.5 mg BMS-820836 at both 8 and 24 h post-dose. Striatal DAT occupancy ranged between 14 % and 35 % at 8 h post-dose with a slight decline at 24 h post-dose. CONCLUSIONS: Multiple daily doses of up to 4 mg BMS-820836 appeared to be generally safe and well tolerated in a healthy population. SERT and DAT occupancies were in a range associated with therapeutic efficacy of antidepressants. Together with the pharmacokinetic profile of BMS-820836, the occupancy data support once-daily administration.
Subject(s)
Dopamine Plasma Membrane Transport Proteins/drug effects , Isoquinolines , Neostriatum/drug effects , Neurotransmitter Uptake Inhibitors , Pyridazines , Serotonin Plasma Membrane Transport Proteins/drug effects , Adult , Dose-Response Relationship, Drug , Double-Blind Method , Female , Humans , Isoquinolines/administration & dosage , Isoquinolines/adverse effects , Isoquinolines/pharmacokinetics , Isoquinolines/pharmacology , Male , Middle Aged , Neurotransmitter Uptake Inhibitors/administration & dosage , Neurotransmitter Uptake Inhibitors/adverse effects , Neurotransmitter Uptake Inhibitors/pharmacokinetics , Neurotransmitter Uptake Inhibitors/pharmacology , Positron-Emission Tomography , Pyridazines/administration & dosage , Pyridazines/adverse effects , Pyridazines/pharmacokinetics , Pyridazines/pharmacology , Young AdultABSTRACT
BACKGROUND: During perimenopause, vasomotor symptoms are known to have a detrimental effect on women's functional ability and quality of life. For symptomatic women not eligible for hormonal therapy, desvenlafaxine is an option, but its safety margin and tolerability are not yet determined. METHODS: A computer-based literature search was done in the databases of MEDLINE, Cochrane library, and HINARI (Health InterNetwork Access to Research Initiative). Meta-analysis was conducted by including double-blind randomized controlled studies on the effectiveness and safety of desvenlafaxine in the treatment of hot flashes. The effectiveness, safety and tolerability of desvenlafaxine were determined by standardized mean differences (SMDs) and Mantel-Haenszel odds ratio. Subgroup analysis based on doses of desvenlafaxine and linear meta-regression analyses were performed for several covariates. Heterogeneity testing, the risk of bias assessment and sensitivity analyses were done. RESULTS: Desvenlafaxine was associated with a statistically significant reduction in the number and severity of daily moderate to severe hot flashes. The number of nighttime awakenings because of hot flashes was also significantly decreased. However, the rate of desvenlafaxine treatment discontinuation because of adverse events was a significantly higher than placebo treated women and the risk ratios of adverse events like asthenia, hypertension, anorexia, constipation, diarrhea, dry mouth, nausea, dizziness, insomnia, somnolence and mydriasis were very high. CONCLUSION: Desvenlafaxine is effective in the treatment of hot flashes but it is strongly associated with several adverse events and treatment discontinuation. Further clinical trials focusing only on desvenlafaxine related adverse events are highly warranted before it is approved for public use.
Subject(s)
Cyclohexanols/therapeutic use , Hot Flashes/drug therapy , Menopause/drug effects , Neurotransmitter Uptake Inhibitors/therapeutic use , Chemotherapy, Adjuvant , Cyclohexanols/adverse effects , Desvenlafaxine Succinate , Double-Blind Method , Female , Humans , Neurotransmitter Uptake Inhibitors/adverse effects , Randomized Controlled Trials as Topic , Regression AnalysisABSTRACT
Though GABA is the major inhibitory neurotransmitter in the brain, involved in a wide variety of brain functions and many neuropsychiatric disorders, its intracellular and metabolic presence provides uncertainty in the interpretation of the GABA signal measured by (1)H-MRS. Previous studies demonstrating the sensitivity of this technique to pharmacological manipulations of GABA have used nonspecific challenges that make it difficult to infer the exact source of the changes. In this study, the synaptic GABA reuptake inhibitor tiagabine, which selectively blocks GAT1, was used to test the sensitivity of J-difference edited (1)H-MRS to changes in extracellular GABA concentrations. MEGA-PRESS was used to obtain GABA-edited spectra in 10 male individuals, before and after a 15-mg oral dose of tiagabine. In the three voxels measured, no significant changes were found in GABA+ concentration after the challenge compared to baseline. This dose of tiagabine is known to modulate synaptic GABA and neurotransmission through studies using other imaging modalities, and significant increases in self-reported sleepiness scales were observed. Therefore, it is concluded that recompartmentalization of GABA through transport block does not have a significant impact on total GABA concentration. Furthermore, it is likely that the majority of the magnetic resonance spectroscopy (MRS)-derived GABA signal is intracellular. It should be considered, in individual interpretation of GABA MRS studies, whether it is appropriate to attribute observed effects to changes in neurotransmission.
Subject(s)
Brain/metabolism , Neurotransmitter Uptake Inhibitors , Nipecotic Acids , Proton Magnetic Resonance Spectroscopy/methods , Synapses/metabolism , gamma-Aminobutyric Acid/metabolism , Adult , Brain/drug effects , Extracellular Space/drug effects , Extracellular Space/metabolism , GABA Plasma Membrane Transport Proteins/metabolism , Humans , Male , Middle Aged , Neurotransmitter Uptake Inhibitors/adverse effects , Nipecotic Acids/adverse effects , Synapses/drug effects , Tiagabine , Young AdultABSTRACT
We carried out a secondary analysis of a double-blind, placebo-controlled trial of desvenlafaxine for major depressive disorder (MDD) to explore the associations between depressive symptoms and subtypes, and functional outcomes, including work functioning. Employed outpatients with MDD were assigned randomly in a 2 : 1 ratio to receive desvenlafaxine 50 mg/day or placebo for 12 weeks. Analyses were carried out post-hoc with the intent-to-treat (ITT) sample (N=427) and a prospectively defined modified ITT sample (N=310), composed of patients with baseline 17-item Hamilton Rating Scale for Depression score of at least 20. Functional outcomes at week 12 included items and factors from the Montgomery-Åsberg Depression Rating Scale, Sheehan Disability Scale, and the Work Productivity and Activity Impairment questionnaire. In the modified ITT sample, but not in the ITT sample, desvenlafaxine-treated patients showed significantly greater improvement in several functional outcomes in the responder, nonanxious, and normal-energy patient subgroups. Improvement in the 17-item Hamilton Rating Scale for Depression total score at week 2 predicted change at week 12 in several functional outcomes. Functional improvement at 12 weeks was greater in subgroups of patients and was also significantly predicted by early improvement in depressive symptoms in employed patients with MDD treated with desvenlafaxine.
Subject(s)
Antidepressive Agents/therapeutic use , Cyclohexanols/therapeutic use , Depressive Disorder, Major/drug therapy , Neurotransmitter Uptake Inhibitors/therapeutic use , Adult , Aged , Antidepressive Agents/adverse effects , Canada , Cyclohexanols/adverse effects , Depressive Disorder, Major/physiopathology , Depressive Disorder, Major/psychology , Desvenlafaxine Succinate , Diagnostic and Statistical Manual of Mental Disorders , Double-Blind Method , Efficiency/drug effects , Employment , Female , Humans , Intention to Treat Analysis , Male , Middle Aged , Neurotransmitter Uptake Inhibitors/adverse effects , Psychiatric Status Rating Scales , Self Report , Severity of Illness Index , Time Factors , United States , Young AdultABSTRACT
OBJECTIVE: Cognitive impairment is integral to many neurological illnesses. Specific enhancement of glutamatergic transmission may improve memory and learning. Org 25935 increases the synaptic availability of glycine, an obligate co-agonist with glutamate at N-methyl-D-aspartate receptors. We hypothesised that Org 25935 would acutely improve the learning and memory of healthy volunteers. METHODS: A randomised, double-blind, parallel-group, single-dose study of Org 25935 and placebo was carried out. Thirty-two healthy male volunteers took either 12-mg Org 25935 or matching placebo and were later assessed with the manikin task, digit span and verbal memory tests. Systematic assessments of cardiovascular and adverse events were also taken. RESULTS: There was no effect of Org 25935 on reaction time, number of correct responses or learning (greater or slower improvement over successive tasks) compared with placebo. Org 25935 caused significantly more dizziness and drowsiness compared with placebo; these side effects were mainly mild. CONCLUSIONS: A single dose of Org 25935 does not improve learning or memory in healthy male individuals. However, the drug was well tolerated, and it remains to be seen whether it would have a positive effect on cognition in patient groups with pre-existing cognitive deficits.
Subject(s)
Cognition/drug effects , Memory/drug effects , Neurotransmitter Uptake Inhibitors/pharmacology , Tetrahydronaphthalenes/pharmacology , Adolescent , Adult , Blood Pressure/drug effects , Double-Blind Method , Electrocardiography , Heart/drug effects , Heart/physiology , Heart Rate/drug effects , Humans , Male , Middle Aged , Neuropsychological Tests , Neurotransmitter Uptake Inhibitors/adverse effects , Neurotransmitter Uptake Inhibitors/blood , Reaction Time , Task Performance and Analysis , Tetrahydronaphthalenes/adverse effects , Tetrahydronaphthalenes/blood , Treatment Outcome , Young AdultSubject(s)
Antidepressive Agents/therapeutic use , Cyclohexanols/therapeutic use , Depressive Disorder/drug therapy , Neurotransmitter Uptake Inhibitors/therapeutic use , Antidepressive Agents/adverse effects , Cyclohexanols/adverse effects , Desvenlafaxine Succinate , Humans , Neurotransmitter Uptake Inhibitors/adverse effectsABSTRACT
RATIONALE: BMS-820836, a novel triple monoamine reuptake inhibitor, is an experimental monotherapy for sufferers of major depressive disorder who have had an inadequate response to an existing antidepressant treatment. OBJECTIVES: This study was conducted to evaluate the safety and tolerability, pharmacokinetics (PK), and serotonin transporter (SERT) and dopamine transporter (DAT) occupancy for single doses of BMS-820836 in healthy subjects. METHODS: Healthy subjects were assigned to seven BMS-820836 dose panels (0.025, 0.1, 0.5, 1, 2, 3, and 5 mg; n = 8 each), in which subjects were randomly allocated 3:1 to a single BMS-820836 dose or matched placebo. Serial blood samples were collected on Days 1, 2, 3, 4, 7, and 14 to characterize the PK of BMS-820836. Following evaluation of the maximum tolerated dose, SERT occupancy was determined by applying [(11)C]DASB positron emission tomography (PET) after single-dose BMS-820836 (0.5 or 3 mg; n = 3 each) and DAT occupancy by applying [(11)C]PE2I PET after single-dose BMS-820836 (3 mg; n = 6). RESULTS: Single oral doses of BMS-820836 (0.025-3 mg) were generally safe and well tolerated. BMS-820836 had a median T max of 5.0-7.2 h and a mean apparent terminal T 1/2 of 34-57 h. Mean striatal SERT occupancies were 19 ± 9 % and 82 ± 8 % after single doses of 0.5 and 3 mg BMS-820836, respectively. The mean striatal DAT occupancy was 19 ± 9 % after a single 3 mg BMS-820836 dose. CONCLUSIONS: Single doses of BMS-820836 have meaningful SERT and DAT occupancy and demonstrate an acceptable safety and tolerability profile in healthy control subjects.
Subject(s)
Isoquinolines/adverse effects , Isoquinolines/pharmacokinetics , Neurotransmitter Uptake Inhibitors/adverse effects , Neurotransmitter Uptake Inhibitors/pharmacokinetics , Pyridazines/adverse effects , Pyridazines/pharmacokinetics , Administration, Oral , Adolescent , Adult , Blood Chemical Analysis , Brain/diagnostic imaging , Brain/drug effects , Brain/metabolism , Dopamine Plasma Membrane Transport Proteins/metabolism , Dose-Response Relationship, Drug , Double-Blind Method , Female , Humans , Isoquinolines/administration & dosage , Male , Maximum Tolerated Dose , Middle Aged , Neurotransmitter Uptake Inhibitors/administration & dosage , Positron-Emission Tomography , Pyridazines/administration & dosage , Serotonin Plasma Membrane Transport Proteins/metabolism , Young AdultABSTRACT
INTRODUCTION: The dysfunctions of three very important monoamine neurotransmitters, serotonin (5-HT), norepinephrine (NE) and dopamine (DA), are associated with some of important CNS diseases such as depression; developing the triple reuptake inhibitors (TRIs) that can rebalance 5-HT, NE and DA through the inhibition of the monoamine reuptake transporters will lead to a more effective and safer antidepressant. AREAS COVERED: This article reviews past 7 years' advances in the development of TRIs; a patent review (2006 - 2012), covering the discovery of new chemical entities, and development status of leading TRI clinical candidates. EXPERT OPINION: The development of TRIs has several challenges, including discovering a "single" agent that has the activities against all three monoamine reuptake transporters SERT, NET and DAT. More important is that the agent must have a "right ratio" to be safer and better tolerated for the treatment of depression. The TRIs can potentially be used for the treatment of other CNS diseases, such as pain, Parkinson's and attention deficit hyperactivity disorder (ADHD), depending on ratios of SERT, NET and DAT.
Subject(s)
Antidepressive Agents/pharmacology , Neurotransmitter Uptake Inhibitors/pharmacology , Adrenergic Uptake Inhibitors/pharmacology , Animals , Antidepressive Agents/adverse effects , Antidepressive Agents/chemistry , Dopamine Uptake Inhibitors/pharmacology , Drug Design , Drug and Narcotic Control , Humans , Molecular Structure , Neurotransmitter Uptake Inhibitors/adverse effects , Neurotransmitter Uptake Inhibitors/chemistry , Patents as Topic , Selective Serotonin Reuptake Inhibitors/pharmacology , Structure-Activity RelationshipABSTRACT
Depression during pregnancy and in the post partum period is a significant health issue in modern society. The estimated prevalence of depression in pregnancy ranges from 13-20%. The major dilemma for gynecologists is to treat or not to treat depression during gestation and lactation. Consequences of untreated depression can be so serious that the benefit of antidepressant therapy may overweigh the possible risk for injury of fetal/neonatal development. Currently, selective serotonin re-uptake inhibitors (SSRIs) and serotonin and noradrenaline re-uptake inhibitors (SNRIs) are commonly used for treatment of maternal depression. The review article brings up-to-date knowledge on effects of maternal adversity (depression) and/or antidepressants on the development of the hypothalamus-pituitary-adrenal axis of the offspring in relation to postnatal behavior and reactivity to stressful stimuli. Treated as well as untreated maternal depression presents a risk for the developing fetus and neonate. The authors stress the need to evaluate the relative safety of SNRIs/SNRIs by means of relevant experimental models to assess if these drugs can be assigned to treat pregnant and lactating depressive women.