Nortriptyline chemical structure
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Pamelor

Nortriptyline hydrochloride is 1-Propanamine, 3-(10,11-dihydro, 5H-dibenzo cyclohepten- 5-ylidene)-N-methyl-,hydrochloride. It is a second generation tricyclic antidepressant marketed under the tradenames Aventyl® and Pamelor®. It is used in the treatment of depression and childhood nocturnal enuresis (bedwetting). In addition it is sometimes used for chronic pain modification. more...

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Clinical Pharmacology

Nortriptyline inhibits the reuptake of norepinephrine (noradrenalin) and, to a lesser extent, serotonin. Operant conditioning techniques in rats and pigeons suggest that nortriptyline has a combination of stimulant and depressant properties.

Indications

FDA-approved for treatment of depressive disorders. In UK also may be used for treating nocturnal enuresis with courses of treatment lasting no moer than 3 months. Also off-label used for the treatment of panic disorder, prevention of migraine headaches and chronic pain or neuralgia modification (particularly Temporomandibular joint disorder).

Metabolism

Nortriptyline is metabolised in the liver by hepatic enzyme CYP2D6. Approximately 7 to 10 percent of caucasians are poor metabolisers and might experience more adverse effects, thus, a lower dosage is often necessary in these individuals. Blood levels of nortriptyline should be obtained during long term treatment to avoid toxicity and optimise response.

Dosage

25 - 75mg at bedtime. The dosage may be higher or lower depending on your prescribing physician. Doses above 150 mg/day are not recommended.

Side Effects

Dry mouth, drowsiness, orthostatic hypotension, urinary retention, constipation, and rapid or irregular heartbeat. Some sexual side effects may be a problem as well. Less commonly, seizures and ECG/EKG changes have been reported, especially in overdose. However, the incidence of side effects with nortriptyline is somewhat lower than with the first generation tricyclics (e.g. imipramine (Tofranil®), amitriptyline (Elavil®)).

Warnings

Persons with a history of cardiovascular disease, stroke, glaucoma and/or seizures should be given nortriptyline only under close supervision as well as those who are hyperthyroid or receiving thyroid medication. Patients should be cautioned against the use of alcohol during nortriptyline therapy.

Precautions

Pregnancy and lactation. Children under the age of 18.

Contraindications

In the acute recovery phase after myocardial infarction (e.g. heart attack). Do not use MAO Inhibitors (e.g. phenelzine, tranylcypromine, etc) with nortriptyline as hyperpyretic crises, severe convulsions, and fatalities have occurred when similar tricyclic antidepressants were used in such combinations.

Do not use if you have had serious reactions to other tricyclic antidepressants unless under the close supervision of your prescribing physician.

Overdose

Deaths may occur from overdosage with tricyclic antidepressants. Serious cardiac arrhythmias and coma are also possible. Keep this medication away from infants and children in a child-proof container.

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Migraines & women
From National Women's Health Report, 6/1/05

If you want to know why migraine headaches are three times more prevalent in women than men, affecting an estimated one in five women, think hormones. (20)

**********

Researchers don't know for sure why reproductive hormones and migraines are so intertwined, says migraine expert Sarah DeRossett, MD, PhD, an assistant clinical professor of neurology at Emory University in Atlanta. She suspects it may be that the rise and fall of estrogen levels serves as a trigger for migraines in much the same way as red wine, aged cheese and flashing lights.

Consider these examples of a possible hormone-migraine link:

* Migraines are more common in boys before puberty.

* Migraines occur less often during the first trimester of pregnancy.

* While about 10 to 15 percent of female migraine sufferers have migraines only during their periods, the majority of women who have migraines experience them during their periods.

* The number of migraines usually declines and may cease altogether after menopause.

Under Diagnosed and Under Treated

Fewer than half of all patients who suffer from migraines receive the proper diagnosis. (21) The result? Significant disability for migraine sufferers, with the American Migraine Study II finding that 92 percent of women with severe migraine had some headache-related disability, and about half were severely disabled during an episode, requiring bed rest. (22)

The irony is that excellent treatments are available these days to not only relieve the migraine, but prevent it in the first place. Yet one 1999 study found that only four out of 10 people with migraines used prescription medication for their headaches. (21)

The most commonly prescribed medications for migraine are the triptans, a class of drugs first approved in the early 1990s. Today, there are seven triptans, including sumatriptan (Imitrex), zolmitriptan (Zomig) and eletriptan (Relpax). They work on serotonin receptors in the membranes covering the brain, constricting blood vessels to prevent the sensation of pain.

One thing many patients don't realize, says Dr. DeRossett, is that the triptans work best when taken at the first sign of a migraine. "People fiddle around a lot and under treat their headache (with over-the-counter drugs)," she says. By the time they turn to a stronger medication, it's too late to halt the headache before it hits full strength. So if you're prone to migraines, she recommends taking your prescribed medication at the first sign of pain; don't wait to "prove" that it's a migraine. (23)

For women with two or more headaches a week, a variety of preventive options are available. These include the anti-epileptic drugs topiramate (Topamax) and sodium valproate (Depakote), tricyclic antidepressants such as amitriptyline (Elavil) and nortriptyline (Pamelor), beta blockers such as propranolol (Inderal), calcium blockers such as verapamil, and the antihistamine cyproheptadine (Periactin) in children. (23)

Some headache experts also use Botox injections to prevent migraines, says Dr. DeRossett, with good success. And don't forget complementary and alternative medicine therapies like biofeedback and relaxation therapies. A 1990 meta-analysis comparing the effectiveness of relaxation/biofeedback with drug therapy (propranolol) found both cut the number of headaches by 43 percent. (12)

Certain lifestyle changes can also help prevent migraines. New studies find that obesity is independently associated with migraine, says Dr. DeRossett, so losing weight may help. Other studies find that emotional stress, lack of sleep or oversleeping, skipping meals, certain foods (aged cheese, preserved meats), alcohol (Particularly red wine and beer) and prolonged physical exertion can trigger migraines.

The main message for women, says Dr. DeRossett, is that migraines are very treatable, possibly preventable and almost always improve after menopause. If you've tried at least two preventative medications and are still having frequent headaches, and/or you still have debilitating migraines regardless of prescribed medications, it's time to see a headache specialist. Not only do they have access and knowledge about numerous drugs already on the market, they can often get you into clinical trials for new treatments. "There's more coming in the pipeline," Dr. DeRossett says. "This is going to be more and more of a treatable condition."

COPYRIGHT 2005 National Women's Health Resource Center
COPYRIGHT 2005 Gale Group

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