Does propranolol cause weight gain
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Propranolol and Weight Gain: Clinical Evidence
Several studies and case reports have examined whether propranolol, a non-selective beta-blocker, can cause weight gain. Evidence from both clinical trials and individual case reports suggests that propranolol is associated with weight gain in some patients, though the extent and frequency vary.
Long-Term Propranolol Use and Sustained Weight Gain
A large, placebo-controlled clinical trial found that patients treated with propranolol after a myocardial infarction experienced more weight gain over the course of a year compared to those on placebo (mean difference of 1.2 kg), and this difference persisted over several years. The weight gain was not explained by changes in physical activity or use of other medications and was consistent across age and sex groups, indicating a sustained effect of long-term propranolol use on body weight .
Short-Term and Low-Dose Propranolol: Case Reports
Case reports have documented rapid and significant weight gain even with short-term, low-dose propranolol. In one case, a patient experienced uncontrollable overeating and a 3 kg weight gain within two weeks of starting propranolol, with appetite increasing again upon re-challenge with the drug . Another case described a rapid increase in body weight and BMI in a young woman treated with propranolol, which was linked to increased appetite and lower blood glucose levels .
Propranolol and Weight Gain in Headache and Migraine Prophylaxis
Studies on patients using propranolol for migraine prevention have shown that weight gain can occur, but it is less common and less pronounced compared to other medications like amitriptyline or pizotifen. In a six-month follow-up, only 8% of patients on propranolol experienced significant weight gain, and the average increase was lower than with other drugs . Reviews of migraine-preventive medications confirm that propranolol is associated with some degree of weight gain, but the risk is lower than with certain other agents .
Mechanisms: Appetite, Metabolism, and Hormonal Effects
The mechanism behind propranolol-induced weight gain may involve increased appetite, reduced energy expenditure, and changes in metabolism. Animal studies have shown that propranolol can lead to weight gain, higher insulin levels, and signs of insulin resistance, suggesting that the drug may impair fat breakdown and promote fat storage . In patients with thyroid disorders, propranolol was associated with cessation of weight loss and, in some cases, weight gain, possibly due to its effects on thyroid hormone metabolism .
Not a Universal Side Effect
Despite these findings, weight gain is not universally recognized as a common side effect of propranolol. Some literature reviews and case reports note that increased appetite and weight gain are not among the most frequently reported side effects, and the risk may depend on individual susceptibility and co-administered medications .
Conclusion
Propranolol can cause weight gain in some patients, particularly with long-term use, but the risk and degree of weight gain are generally lower than with some other medications. Short-term and low-dose propranolol may also trigger weight gain in susceptible individuals, often through increased appetite. The effect is not universal, and many patients may not experience significant weight changes. Monitoring weight is advisable for patients starting propranolol, especially those with concerns about weight gain or metabolic health Shahrbabaki2015Boyraz2021Maggioni2005+5 MORE.
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