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작성일 : 14-08-02 02:40
기억력을 잃게 하는 10가지 약
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10 Drugs That May Cause Memory Loss

Having trouble remembering things? One of these meds may be the problem

by Dr. Armon B. Neel Jr., AARP, May 10, 2013

( taken in part  from http://www.aarp.org/health/brain-health/info-05-2013/drugs-that-may-cause-memory-loss.html?cmp=NLC-WBLTR-DSO-NMCTRLF-080114-TS2-384135&encparam=/+gS8P7DPSh4MPkaYxQwMzXLnZveJE9HuuF+FpSQ7Ws= )

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Drugs That May Cause Memory Loss

1. Antianxiety drugs
2. Cholesterol drugs
3. Antiseizure drugs
4. Antidepressant drugs
5. Narcotic painkillers
6. Parkinson's drugs
7. Hypertension drugs
8. Sleeping aids
9. Incontinence drugs
10. Antihistamines

1. Antianxiety drugs (Benzodiazepines)

Why they are prescribed: Benzodiazepines are used to treat a variety of anxiety disorders, agitation, delirium and muscle spasms, and to prevent seizures. Because benzodiazepines have a sedative effect, they are sometimes used to treat insomnia and the anxiety that can accompany depression.

Examples: Alprazolam (Xanax), chlordiazepoxide (Librium), clonazepam (Klonopin), diazepam (Valium), flurazepam (Dalmane), lorazepam (Ativan), midazolam (Versed), quazepam (Doral), temazepam (Restoril) and triazolam (Halcion).

How they can cause memory loss: Benzodiazepines dampen activity in key parts of the brain, including those involved in the transfer of events from short-term to long-term memory. Indeed, benzodiazepines are used in anesthesia for this very reason. When they're added to the anesthesiologist's cocktail of meds, patients rarely remember any unpleasantness from a procedure. Midazolam (Versed) has particularly marked amnesic properties.

2. Cholesterol-lowering drugs (Statins)

Why they are prescribed: Statins are used to treat high cholesterol.

Examples: Atorvastatin (Lipitor), fluvastatin (Lescol), lovastatin (Mevacor), pravastatin (Pravachol), rosuvastatin (Crestor) and simvastatin (Zocor).

How they can cause memory loss: Drugs that lower blood levels of cholesterol may impair memory and other mental processes by depleting brain levels of cholesterol as well. In the brain, these lipids are vital to the formation of connections between nerve cells — the links underlying memory and learning. (The brain, in fact, contains a quarter of the body's cholesterol.)

A study published in the journal Pharmacotherapy in 2009 found that three out of four people using these drugs experienced adverse cognitive effects "probably or definitely related to" the drug. The researchers also found that 90 percent of the patients who stopped statin therapy reported improvements in cognition, sometimes within days. In February 2012, the Food and Drug Administration ordered drug companies to add a new warning label about possible memory problems to the prescribing information for statins.

3. Antiseizure drugs

Why they are prescribed: Long used to treat seizures, these medications are increasingly prescribed for nerve pain, bipolar disorder, mood disorders and mania.

Examples: Acetazolamide (Diamox), carbamazepine (Tegretol), ezogabine (Potiga), gabapentin (Neurontin), lamotrigine (Lamictal), levetiracetam (Keppra), oxcarbazepine (Trileptal), pregabalin (Lyrica), rufinamide (Banzel), topiramate (Topamax), valproic acid (Depakote) and zonisamide (Zonegran).

How they can cause memory loss: Anticonvulsants are believed to limit seizures by dampening the flow of signals within the central nervous system (CNS). All drugs that depress signaling in the CNS can cause memory loss.

4. Antidepressant drugs (Tricyclic antidepressants)

Why they are prescribed: TCAs are prescribed for depression and, increasingly, anxiety disorders, eating disorders, obsessive-compulsive disorder, chronic pain, smoking cessation and some hormone-mediated disorders, such as severe menstrual cramps and hot flashes.

Examples: Amitriptyline (Elavil), clomipramine (Anafranil), desipramine (Norpramin), doxepin (Sinequan), imipramine (Tofranil), nortriptyline (Pamelor), protriptyline (Vivactil) and trimipramine (Surmontil).

How they can cause memory loss: About 35 percent of adults taking TCAs report some degree of memory impairment and about 54 percent report having difficulty concentrating. TCAs are thought to cause memory problems by blocking the action of serotonin and norepinephrine — two of the brain's key chemical messengers

5. Narcotic painkillers

Why they are prescribed: Also called opioid analgesics, these medications are used to relieve moderate to severe chronic pain, such as the pain caused by rheumatoid arthritis.

Examples: Fentanyl (Duragesic), hydrocodone (Norco, Vicodin), hydromorphone (Dilaudid, Exalgo), morphine (Astramorph, Avinza) and oxycodone (OxyContin, Percocet). These drugs come in many different forms, including tablets, solutions for injection, transdermal patches and suppositories.

How they can cause memory loss: These drugs work by stemming the flow of pain signals within the central nervous system and by blunting one's emotional reaction to pain. Both these actions are mediated by chemical messengers that are also involved in many aspects of cognition. So use of these drugs can interfere with long- and short-term memory, especially when used for extended periods of time.

6. Parkinson's drugs (Dopamine agonists)

Why they are prescribed: These drugs are used to treat Parkinson's disease, certain pituitary tumors and, increasingly, restless legs syndrome (RLS).

Examples: Apomorphine (Apokyn), pramipexole (Mirapex) and ropinirole (Requip).

How they can cause memory loss: These meds activate signaling pathways for dopamine, a chemical messenger involved in many brain functions, including motivation, the experience of pleasure, fine motor control, learning and memory. As a result, major side effects can include memory loss, confusion, delusions, hallucinations, drowsiness and compulsive behaviors such as overeating and gambling.

7. Hypertension drugs (Beta-blockers)

Why they are prescribed: Beta-blockers slow the heart rate and lower blood pressure and typically are prescribed for high blood pressure, congestive heart failure and abnormal heart rhythms. They're also used to treat chest pain (angina), migraines, tremors and, in eyedrop form, certain types of glaucoma.

Examples: Atenolol (Tenormin), carvedilol (Coreg), metoprolol (Lopressor, Toprol), propranolol (Inderal), sotalol (Betapace), timolol (Timoptic) and some other drugs whose chemical names end with "-olol."

How they can cause memory loss: Beta-blockers are thought to cause memory problems by interfering with ("blocking") the action of key chemical messengers in the brain, including norepinephrine and epinephrine.

8. Sleeping aids (Nonbenzodiazepine sedative-hypnotics)

Why they are prescribed: Sometimes called the "Z" drugs, these medications are used to treat insomnia and other sleep problems. They also are prescribed for mild anxiety.

Examples: Eszopiclone (Lunesta), zaleplon (Sonata) and zolpidem (Ambien).

How they can cause memory loss: Although these are molecularly distinct from benzodiazepines (see No. 1 above), they act on many of the same brain pathways and chemical messengers, producing similar side effects and problems with addiction and withdrawal.

The "Z" drugs also can cause amnesia and sometimes trigger dangerous or strange behaviors, such as cooking a meal or driving a car — with no recollection of the event upon awakening

9. Incontinence drugs (Anticholinergics)

Why they are prescribed: These medications are used to relieve symptoms of overactive bladder and reduce episodes of urge incontinence, an urge to urinate so sudden and strong that you often can't get to a bathroom in time.

Examples: Darifenacin (Enablex), oxybutynin (Ditropan XL, Gelnique, Oxytrol), solifenacin (Vesicare), tolterodine (Detrol) and trospium (Sanctura). Another oxybutynin product, Oxytrol for Women, is sold over the counter.

How they can cause memory loss: These drugs block the action of acetylcholine, a chemical messenger that mediates all sorts of functions in the body. In the bladder, anticholinergics prevent involuntary contractions of the muscles that control urine flow. In the brain, they inhibit activity in the memory and learning centers. The risk of memory loss is heightened when the drugs are taken for more than a short time or used with other anticholinergic drugs.

A 2006 study of oxybutynin ER, for example, found its effect on memory to be comparable to about 10 years of cognitive aging. ("In other words," as the study's lead author put it, "we transformed these people from functioning like 67-year-olds to 77-year-olds.")

Older people are particularly vulnerable to the other adverse effects of anticholinergic drugs, including constipation (which, in turn, can cause urinary incontinence), blurred vision, dizziness, anxiety, depression and hallucinations

10. Antihistamines (First-generation)

Why they are prescribed: These medications are used to relieve or prevent allergy symptoms or those of the common cold. Some antihistamines are also used to prevent motion sickness, nausea, vomiting and dizziness, and to treat anxiety or insomnia.

Examples: Brompheniramine (Dimetane), carbinoxamine (Clistin), chlorpheniramine (Chlor-Trimeton), clemastine (Tavist), diphenhydramine (Benadryl) and hydroxyzine (Vistaril).

How they can cause memory loss: These medications (prescription and over-the-counter) inhibit the action of acetylcholine, a chemical messenger that mediates a wide range of functions in the body. In the brain, they inhibit activity in the memory and learning centers, which can lead to memory loss.

 
 
 

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