MMM: Sibutramine and OTC Weight Loss Pills

Last week, the FDA announced the recall of Svelte 30 , a non-prescription weight loss supplement. According to lab tests, the product contains a prescription-only drug - sibutramine.
If that weren't bad enough, the drug (a prescription appetite suppressant) is no longer available in the United States because of the potential for serious heart-related side effects. According to an article on PubMed Health from October 2010, anyone taking sibutramine was advised to stop taking the medication and see their physician.
And now it's been found in OTC supplements. [Continue Reading ...]
Sibutramine
Brand names: Ectiva / Meridia / Raductil / Reductil / Sibutral
How It Works
Like SSRIs (Prozac, Paxil, Zoloft), SNRIs (Cymbalta, Effexor, Pristiq), and DRIs (Zyban, Ritalin, Cocaine), sibutramine keeps the brain from reabsorbing serotonin, norepinephrine, and dopamine. This appears to help cells in the brain better send and receive signals.
Blocking serotonin and norephedrine reuptake seems to improve mood, reduce anxiety and compulsive behaviors (OCD). The increased dopamine has a stimulant effect which is believed to improve mood, reduce fatigue and anxiety, and suppress appetite.
What It Does
Although an SNRI like Cymbalta, Meridia was never proven to be an effective antidepressant. Its ability to inhibit reabsorption of dopamine (similar to the actions of amphetamines) does make it effective for some people as an appetite suppressant.
Several sources indicate that patients who lost weight immediately while taking sibutramine were most likely to continue losing weight. It was suggested, however, that those who failed to lose 4 pounds during the first 4 weeks of treatment may be advised to discontinue Meridia.
Why It's a Problem
Blood Pressure
According to the original documentation for sibutramine (see Pharmacycode link below), "Meridia substantially increases blood pressure and/or pulse rate" in some users. The WARNINGS section recommended: a.) frequent blood pressure monitoring and b.) careful prescription, possibly not at all for patients with uncontrolled or poorly controlled hypertension. By August 2010, two months before Abbott voluntarily pulled it from the market, the drug was contraindicated for anyone with heart conditions or blood pressure issues.
Interactions
According to information on Drugs.com, 804 drugs interact with sibutramine. Of those 800+ medications, more than 200 have major interactions.
Naturally, other SSRIs, SNRIs, DRIs, antidepressants, muscle relaxants, diet pills, and stimulants will increase the effects of Meridia. But many prescription and OTC allergy, cold, and migraine medications can also increase the risk of elevated pulse, blood pressure, heart attack, or stroke.
If that weren't enough, sibutramine increases the bleeding risks associated with NSAIDs (aspirin, Motrin, Aleve, Celebrex) and anticoagulants (Coumadin, Heparin). It may also add to the risk of emotional disturbances and suicidal thoughts associated with some central nervous system depressants.
Bottom Line
Now, this discontinued drug is showing up - illegally - in over-the-counter weight loss supplements. Sibutramine was risky enough, when patients knew what they were taking and were monitored by a physician. How much more dangerous will it be when people don't even realize they're taking it?
References:
- http://en.wikipedia.org/wiki/Selective_serotonin_reuptake_inhibitor
- http://en.wikipedia.org/wiki/Serotonin-norepinephrine_reuptake_inhibitor
- http://en.wikipedia.org/wiki/Dopamine_reuptake_inhibitor
- http://en.wikipedia.org/wiki/Serotonin–norepinephrine–dopamine_reuptake_inhibitor
- http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0000097/
- http://pharmacycode.com/fda/Sibutramine
- http://www.drugs.com/drug-interactions/sibutramine.html






















