Prescrire international
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Prescrire international · Oct 2015
Hypothyroidism in adults. Levothyroxine if warranted by clinical and laboratory findings, not for simple TSH elevation.
Hypothyroidism is a common disorder due to inadequate thyroid hormone secretion. When a patient has signs and symptoms suggestive of hypothyroidism, how is it determined whether thyroid hormone replacement therapy will have a favourable harm-benefit balance? How should treatment be managed? To answer these questions, we conducted a review of the literature using the standard Prescrire methodology. The symptoms of hypothyroidism are due to slow metabolism (constipation, fatigue, sensitivity to cold, weight gain, etc.) and to polysaccharide accumulation in certain tissues, leading to hoarseness, eyelid swelling, etc. ⋯ The main challenge is to recognise transient hypothyroidism, which does not require life-long treatment. When the TSH is only slightly elevated, there is a risk of attributing non-specific symptoms to an abnormal laboratory result and prescribing unnecessary treatment. Watchful waiting is an alternative to routine levothyroxine prescription in case of TSH elevation.
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Prescrire international · Oct 2015
Naltrexone + bupropion (Mysimba). Too risky for only modest weight loss.
Weight loss and its long-term maintenance are mainly based on dietary measures and regular physical activity. There are currently no weight-loss medications with a favourable harm-benefit balance. Bupropion is chemically related to certain amphetamines, while naltrexone is an opioid receptor antagonist. ⋯ The naltrexone + bupropion combination is subject to many pharmacokinetic interactions, as well as pharmacodynamic interactions leading to additive convulsive or hypertensive effects, or undermining the action of antihypertensive drugs. A teratogenic effect of bupropion cannot be ruled out. In practice, given the limited effect of the naltrexone + bupropion combination on weight loss (a few kilograms), along with the lack of evidence supporting a persistent benefit or a decrease in the clinical complications of obesity, there is no reason to expose patients to its many potentially severe adverse effects.
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Prescrire international · Sep 2015
Aflibercept (Eylea) and diabetic macular oedema. A first-choice VEGF inhibitor in case of marked visual loss.
Overall, VEGF inhibitors administered by intravitreal injection have a similar harm-benefit balance. However, a publicly funded trial has shown that aflibercept is more effective than ranibizumab and bevacizumab in patients with marked loss of visual acuity.