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In medicine, a side effect is an effect, whether therapeutic or adverse, that is secondary to the one intended; although the term is predominantly employed to describe adverse effects, it can also apply to beneficial, but unintended, consequences of the use of a drug. Occasionally, drugs are prescribed or procedures performed specifically for their side effects; in that case, said side effect ceases to be a side effect, and is now an intended effect. For instance, X-rays were historically (and are currently) used as an imaging technique; the discovery of their oncolytic capability led to their employ in radiotherapy (ablation of malignant tumours). ==Examples of therapeutic side-effects== * Bevacizumab (Avastin), used to slow the growth of blood vessels, has been used against dry age-related macular degeneration, as well as macular edema from diseases such as diabetic retinopathy and central retinal vein occlusion. *Buprenorphine has been shown experimentally (1982–1995) to be effective against severe, refractory depression. * Bupropion, an anti-depressant sold as Wellbutrin, is also used as a smoking cessation aid; this indication was later approved, and the name of the smoking cessation product is Zyban. In Ontario, Canada, smoking cessation drugs are not covered by provincial drug plans; elsewhere, Zyban is priced higher than Wellbutrin, despite being the same drug. Therefore, some physicians prescribe Wellbutrin for both indications. * Sildenafil was originally intended for pulmonary hypertension; subsequently, it was discovered that it also produces erections, for which it was later marketed. * Carbamazepine is an approved treatment for manic depression and convulsions, but has side effects useful in treating attention-deficit hyperactivity disorder (ADHD), schizophrenia, phantom limb syndrome, paroxysmal extreme pain disorder, neuromyotonia, and post-traumatic stress disorder.〔(Mood Stabilizers for Bipolar Disorder (Manic Depressive) ). Leeheymd.com (2003-08-01). Retrieved on 2011-08-17.〕 * Dexamethasone and Betamethasone in premature labor, to enhance pulmonary maturation of the fetus. * Doxepin has been used to treat Angiodema and severe allergic reactions due to its strong antihistamine properties. * Gabapentin, approved for treatment of seizures and postherpetic neuralgia in adults, has side-effects which are useful in treating bipolar disorder, essential tremor, hot flashes, migraine prophylaxis, neuropathic pain syndromes, phantom limb syndrome, and restless leg syndrome.〔(Off-label Use of Gabapentin ), Idaho Drug Utilization Review, Educational Leaflet, 2004.〕 * Hydroxyzine, an antihistamine, is also used as an anxiolytic. * Magnesium sulfate in obstetrics for premature labor and preeclampsia.〔name=wing/> * Methotrexate (MTX), approved for the treatment of choriocarcinoma, is frequently used for the medical treatment of an unruptured ectopic pregnancy. * The SSRI medication sertraline is approved as an anti-depressant, but delays conjugal climax in men, and thus may be supplied to those in which climax is premature. Examples of side effects for otoxid capsules include: * Echinacea – more than 20 different types of reactions have been reported, including asthma attacks, loss of pregnancy, hives, swelling, aching muscles and gastrointestinal upsets. * Feverfew – pregnant women should avoid using this herb, as it can trigger uterine contractions. In animal experiments, the use of feverfew was found to trigger spontaneous abortions (miscarriages). * Asteraceae plants – which include feverfew, echinacea, dandelion and chamomile. Side effects include allergic dermatitis and hay fever. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Side effect」の詳細全文を読む スポンサード リンク
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