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- What is sibutramine, and how does it work (mechanism of action)?
- What brand names are available for sibutramine?
- Is sibutramine available as a generic drug?
- Do I need a prescription for sibutramine?
- What are the side effects of sibutramine?
- What is the dosage for sibutramine?
- Which drugs or supplements interact with sibutramine?
- Is sibutramine safe to take if I'm pregnant or breastfeeding?
- What else should I know about sibutramine?
What is sibutramine, and how does it work (mechanism of action)?
Sibutramine is a medication that assists with weight-loss by altering neurotransmitters within the brain. Neurotransmitters are chemicals that are produced and released by nerves in order to communicate with other nerves. Released neurotransmitters may attach to other nerves or they may be taken up again by the nerves that release them, a process termed reuptake. Sibutramine blocks the reuptake of the neurotransmitters dopamine, norepinephrine, and serotonin. Blocking the reuptake of neurotransmitters alters the balance of neurotransmitters within the nerve cells and thereby affect nerve function and interaction.
Patients taking sibutramine may achieve a 5-10% reduction from their baseline weight. Additionally, sibutramine-assisted weight loss has been accompanied by improvement in blood lipids (e.g, cholesterol). Sibutramine was approved by the FDA in 1997.
What are the side effects of sibutramine?
In general, sibutramine is well-tolerated. The most common side effects have been:
- inability to sleep,
- dry mouth,
- abdominal pain,
- chest pain,
- joint pain,
- back pain,
- changes in taste,
- irregular or painful menstrual periods,
- flu-like syndrome,
- increased cough,
- muscle pain,
- neck pain,
- tingling of the extremities,
- sore throat, and
- sinus congestion.
Abnormal liver tests have been reported in 1 in 60 persons who receive sibutramine.
Other important side effects include:
However, it has not been established that sibutramine caused these events. If any of these events occur during treatment, sibutramine probably should be discontinued.
What is the dosage for sibutramine?
Sibutramine is taken once daily, generally in the morning. Therapy usually is started with one 10mg tablet per day. The dose may be increased to 15mg by the physician after several weeks to achieve the desired effect. Doses of up to 60mg have been studied. Sibutramine may be taken with or without food.
Which drugs or supplements interact with sibutramine?
Sibutramine must be converted in the liver to its active form. This conversion is inhibited by ketoconazole (Nizoral), cimetidine (Tagamet) and erythromycin (Erytab, Eryc, Ilosone), and use of these drugs can result in decreased conversion and effectiveness of sibutramine. Several other drugs may have a similar effect. These other drugs include clarithromycin (Biaxin), danazol (Danocrine), diltiazem (Cardizem, Tiazac, Dilacor), fluconazole (Diflucan), fluoxetine (Prozac), itraconazole (Sporanox), propoxyphene (Darvon), troleandomycin (Tao) and verapamil (Verelan, Covera, Calan, Isoptin).
In patients receiving one of the drugs from a class of drugs known as selective serotonin reuptake inhibitors (SSRIs), for example, fluoxetine (Prozac), fluvoxamine (Luvox), paroxetine (Paxil), sertraline (Zoloft)--at the same time as monoamine oxidase inhibitor drugs (MAO inhibitors), there have been reports of serious reactions (serotonin syndrome). The serotonin syndrome may include one or more of the following: agitation, anxiety, dizziness, confusion, excessive sweating, disorientation, painful joints, vomiting, hyperexcitement, fever, loss of coordination, loss of consciousness, shivering, fast heart rate, tremor, and weakness. As discussed previously, sibutramine, like the SSRIs, blocks the reuptake of serotonin and may also cause the serotonin syndrome. Therefore, sibutramine should not be used with MAO inhibitors, and there should be at least a 2-week interval between stopping an MAO inhibitor and starting sibutramine. Similarly, there should be at least a 2-week interval after stopping sibutramine and starting an MAO inhibitor. Serotonin syndrome also has been reported with the use of SSRIs at the same time as medications used for migraines such as sumatriptan (Imitrex), zolmitriptan (Zomig) and dihydroergotamine (DHE), as well as dextromethorphan (found in many cough medications such as Robitussin-DM), meperidine (Demerol), pentazocine (Talwin) and fentanyl (Duragesic), or lithium (Eskalith). Therefore, these drugs should not be used with sibutramine.
Is sibutramine safe to take if I'm pregnant or breastfeeding?
No adequate studies with sibutramine have been done in pregnant women. The use of sibutramine during pregnancy, therefore, is not recommended. Women who could become pregnant should use adequate contraception while taking sibutramine.
It is unknown whether sibutramine or its active products accumulate in breast milk. Sibutramine, therefore, is not recommended for nursing mothers.
What else should I know about sibutramine?
What preparations of sibutramine are available?
Capsules: 5mg (blue and yellow); 10mg (blue and white); 15mg (white and yellow)
How should I keep sibutramine stored?
Capsules should be stored at 25°C (77°F). Brief periods at higher or lower temperatures, i.e., 15-30°C (59-86°F) are permitted. The medication should be stored in a tight, light-resistant container. The capsules should be protected from heat and moisture.
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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