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Zyban
Zyban
Zyban is a prescription medication designed to help smokers quit more
easily than without the drug. It comes in a pill form. It does not contain nicotine
Zyban's history is interesting. Smokers who happened to be users of
the anti-depression medication Wellbutrin (bupropion hydrochloride)
often reported a lessening in the desire for cigarettes. Through further
testing, the drug was found to be effective in treating the smoking
addiction, and helping smokers quit. GlaxoSmithKline "repackaged"
Wellbutrin and marketed it as the smoking-cessation drug Zyban.
Unlike nicotine patches or nicotine gum, Zyban does not put more
nicotine into your body. If you use the patches or gum, you should stop
smoking so that you don't "overdose" on nicotine. With Zyban, you
continue to smoke when you first start taking the medication, eventually
reaching a quit-date, and taking the drug for a period of time after
quitting.
Before taking Zyban, smokers want to know what Zyban will do to make
quitting easier. According to the results reported during clinical
trials, "treatment with ZYBAN reduced withdrawal symptoms compared to
placebo. Reductions on the following withdrawal symptoms were most
pronounced: irritability, frustration, or anger; anxiety; difficulty
concentrating; restlessness; and depressed mood or negative affect.
Depending on the study and the measure used, treatment with ZYBAN showed
evidence of reduction in craving for cigarettes or urge to smoke
compared to placebo."
Zyban is not without side-effects. According the the Zyban website,
"The most common side effects experienced with ZYBAN include dry mouth
and difficulty sleeping. There are other risks associated with the use
of ZYBAN, so it is important to talk to your healthcare professional to
see whether ZYBAN is right for you. There is a risk of seizure
associated with ZYBAN, which is increased in certain patients."
Zyban has proven more effective than placebo in clinical testing,
with success rates ranging as high as 58% in one study. Most studies
showed success rates at somewhere between 15%-25%. Long-term success
rates are obviously on the lower end, as smokers tend to relapse after
longer periods of time. Some studies included using Zyban in conjunction
with nicotine patches.
Because medications such as Zyban have potential dangers and
side-effects, the full text from the Zyban web-site quoted here:
CONTRAINDICATIONS
ZYBAN is contraindicated in patients with a seizure disorder.
ZYBAN is contraindicated in patients treated with WELLBUTRIN,
WELLBUTRIN SR, or
any other medications that contain bupropion because the incidence
of seizure is dose dependent.
ZYBAN is contraindicated in patients with a current or prior
diagnosis of bulimia or anorexia
nervosa because of a higher incidence of seizures noted in patients
treated for bulimia with the
immediate-release formulation of bupropion.
ZYBAN is contraindicated in patients undergoing abrupt
discontinuation of alcohol or
sedatives (including benzodiazepines).
The concurrent administration of ZYBAN and a monoamine oxidase (MAO)
inhibitor is
contraindicated. At least 14 days should elapse between
discontinuation of an MAO inhibitor and
initiation of treatment with ZYBAN.
ZYBAN is contraindicated in patients who have shown an allergic
response to bupropion or
the other ingredients that make up ZYBAN.
WARNINGS
Patients should be made aware that ZYBAN contains the same active
ingredient found
in WELLBUTRIN and WELLBUTRIN SR used to treat depression, and that
ZYBAN
should not be used in combination with WELLBUTRIN, WELLBUTRIN SR, or
any other
medications that contain bupropion.
Because the use of bupropion is associated with a dose-dependent
risk of seizures,
clinicians should not prescribe doses over 300 mg/day for smoking
cessation. The risk of
seizures is also related to patient factors, clinical situation, and
concurrent medications,
which must be considered in selection of patients for therapy with
ZYBAN. ZYBAN should
be discontinued and not restarted in patients who experience a
seizure while on treatment.
• Dose: For smoking cessation, doses above 300 mg/day should not be
used. The seizure
rate associated with doses of sustained-release bupropion up to 300
mg/day is
approximately 0.1% (1/1,000). This incidence was prospectively
determined during an
8-week treatment exposure in approximately 3,100 depressed patients.
Data for the
immediate-release formulation of bupropion revealed a seizure
incidence of
approximately 0.4% (4/1,000) in depressed patients treated at doses
in a range of 300 to
450 mg/day. In addition, the estimated seizure incidence increases
almost tenfold
between 450 and 600 mg/day.
• Patient factors: Predisposing factors that may increase the risk
of seizure with
bupropion use include history of head trauma or prior seizure,
central nervous system
(CNS) tumor, the presence of severe hepatic cirrhosis, and
concomitant medications
that lower seizure threshold.
• Clinical situations: Circumstances associated with an increased
seizure risk include,
among others, excessive use of alcohol or sedatives (including
benzodiazepines);
addiction to opiates, cocaine, or stimulants; use of
over-the-counter stimulants and
anorectics; and diabetes treated with oral hypoglycemics or insulin.
• Concomitant medications: Many medications (e.g., antipsychotics,
antidepressants,
theophylline, systemic steroids) are known to lower seizure
threshold.
Recommendations for Reducing the Risk of Seizure: Retrospective
analysis of clinical
experience gained during the development of bupropion suggests that
the risk of seizure
may be minimized if
• the total daily dose of ZYBAN does not exceed 300 mg (the maximum
recommended
dose for smoking cessation), and
• the recommended daily dose for most patients (300 mg/day) is
administered in divided
doses (150 mg twice daily).
• No single dose should exceed 150 mg to avoid high peak
concentrations of bupropion
and/or its metabolites.
ZYBAN should be administered with extreme caution to patients with a
history of
seizure, cranial trauma, or other predisposition(s) toward seizure,
or patients treated with
other agents (e.g., antipsychotics, antidepressants, theophylline,
systemic steroids, etc.) that
lower seizure threshold.
Hepatic Impairment: ZYBAN should be used with extreme caution in
patients with severe
hepatic cirrhosis. In these patients a reduced frequency of dosing
is required, as peak
bupropion levels are substantially increased and accumulation is
likely to occur in such
patients to a greater extent than usual. The dose should not exceed
150 mg every other day
in these patients (see CLINICAL PHARMACOLOGY, PRECAUTIONS, and
DOSAGE
AND ADMINISTRATION).
You can get more complete information at the official Zyban website:
http://www.zyban.com
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