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Side Effect Of Drugs

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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).


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Frequency of side effects

The probability or chance of experiencing side effects are characterised as :

  • Very common >=1/10
  • Common (frequent) >=1/100 and <1/10
  • Uncommon (infrequent) >=1/1000 and <1/100
  • Rare >=1/10000 and <1/1000
  • Very rare <1/10000

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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 (Wellbutrin), an anti-depressant, 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.
  • Carbamazepine is an approved treatment for bipolar disorder and epileptic seizures, but it 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.
  • 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 disorder1, essential tremor, hot flashes, migraine prophylaxis, neuropathic pain syndromes, phantom limb syndrome, and restless leg syndrome.
  • Hydroxyzine, an antihistamine, is also used as an anxiolytic.
  • Magnesium sulfate in obstetrics for premature labor and preeclampsia.
  • 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 antidepressant but delays conjugal climax in men, and thus may be supplied to those in which climax is premature.
  • Sildenafil was originally intended for pulmonary hypertension; subsequently, it was discovered that it also produces erections, for which it was later marketed.
  • Terazosin, an ?1-adrenergic antagonist approved to treat benign prostatic hyperplasia (enlarged prostate) and hypertension, is (one of several drugs) used off-label to treat drug induced diaphoresis and hyperhidrosis (excessive sweating).

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Examples of undesirable/unwanted side effects

  • 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.

Source of the article : Wikipedia



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