Drugs that cause weight gain
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Drugs That Cause Weight Gain: A Comprehensive Overview
Introduction to Drug-Induced Weight Gain
Weight gain is a common side effect of various medications, particularly those used in psychotropic therapy. This adverse effect can lead to noncompliance with treatment and exacerbate comorbid conditions related to obesity, such as diabetes and cardiovascular diseases Serretti2010Domecq2015Sachs1999. Understanding which drugs are associated with weight gain and the mechanisms behind this can help in making informed treatment decisions.
Antidepressants and Weight Gain
Tricyclic Antidepressants (TCAs) and Mirtazapine
Among antidepressants, tricyclic antidepressants (TCAs) like amitriptyline and mirtazapine are frequently associated with significant weight gain. This is thought to be due to their ability to block histaminergic, adrenergic, and cholinergic receptors, which can increase appetite and alter metabolic rates Serretti2010Vanina2002Salvi2016. Studies have shown that amitriptyline and mirtazapine can lead to substantial weight gain over the course of treatment Serretti2010Domecq2015Vanina2002.
Selective Serotonin Reuptake Inhibitors (SSRIs)
SSRIs, such as paroxetine, have also been linked to weight gain, although the effect is generally less pronounced compared to TCAs. Interestingly, some SSRIs like fluoxetine may initially cause weight loss, but this effect is often transient and may reverse with prolonged use Serretti2010Vanina2002Salvi2016.
Antipsychotics and Weight Gain
Atypical Antipsychotics
Atypical antipsychotics, including olanzapine, quetiapine, and risperidone, are well-documented for their propensity to cause weight gain. These medications can lead to significant increases in body weight, which is a major concern for long-term treatment adherence and metabolic health Domecq2015Sachs1999Vanina2002+1 MORE. The weight gain associated with these drugs is often due to their impact on neurotransmitter systems that regulate appetite and metabolism Salvi2016Panizzutti2021.
Mechanisms of Weight Gain
The weight gain induced by antipsychotics is believed to be linked to their effects on lipid metabolism and the expression of genes involved in lipid biosynthesis. For instance, quetiapine has been shown to increase the expression of SREBF1 and SREBF2, transcription factors that regulate lipid metabolism, thereby contributing to weight gain and metabolic disturbances .
Mood Stabilizers and Weight Gain
Mood stabilizers such as lithium and valproic acid are also associated with weight gain. These drugs can lead to significant increases in body weight, which can be problematic for patients with bipolar disorder or other mood disorders Sachs1999Vanina2002Ruetsch2005. The mechanisms behind this weight gain are not fully understood but may involve alterations in metabolic rates and appetite regulation .
Antiepileptic Drugs and Weight Gain
Certain antiepileptic drugs (AEDs), including valproate and carbamazepine, are known to promote weight gain. Conversely, some AEDs like topiramate and zonisamide may induce weight loss, highlighting the variability in weight effects within this drug class Domecq2015Ness-Abramof2005.
Diabetes Medications and Weight Gain
Insulin and Insulin Secretagogues
Improved glycemic control achieved through insulin therapy or insulin secretagogues is often accompanied by weight gain. This is a significant side effect as it can worsen glucose control and increase the risk of cardiovascular diseases Ruetsch2005Pijl1996.
Thiazolidinediones
Thiazolidinediones, such as pioglitazone, are also associated with weight gain. This class of drugs can lead to increases in body weight, which may counteract their benefits in managing blood sugar levels .
Conclusion
Weight gain is a significant side effect of many commonly prescribed medications, particularly those used in psychotropic and diabetes therapies. Understanding the specific drugs and their mechanisms can help healthcare providers make better treatment choices and implement strategies to mitigate this adverse effect. Monitoring and managing weight gain through dietary counseling, physical activity, and careful drug selection are essential to improve patient outcomes and adherence to therapy.
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Most relevant research papers on this topic
Antidepressants and body weight: a comprehensive review and meta-analysis.
Antidepressants may cause weight gain or weight loss, with amitriptyline, mirtazapine, and paroxetine being more likely to cause weight gain, while fluoxetine and bupropion may cause weight loss.
Clinical review: Drugs commonly associated with weight change: a systematic review and meta-analysis.
Several drugs are associated with weight change, guiding drug choice and preemptive weight loss strategies when obesogenic drugs are prescribed.
Weight gain associated with use of psychotropic medications.
Preventing weight gain is crucial, and addressing it as soon as it occurs is crucial for effective treatment and long-term outcomes.
H1-histamine receptor affinity predicts weight gain with antidepressants.
Antidepressants with H1-histamine receptor affinity are the strongest predictor of weight gain, suggesting a need for pharmacodynamic classification and avoidance in patients at risk for cardio-metabolic disturbances.
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